SOX9

UniProt ID: P48436
Organism: Homo sapiens
Review Status: COMPLETE
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Gene Description

SOX9 is a SOXE-family transcription factor that plays dual core roles in development. First, SOX9 is the master regulator of chondrogenesis, cooperating with SOX5 and SOX6 to drive cartilage matrix gene expression (COL2A1, ACAN) and promoting chondrocyte differentiation while antagonizing osteoblast differentiation via beta-catenin inhibition. Second, SOX9 is critical for oligodendrocyte differentiation and glial fate specification, promoting glial over neuronal fates in the CNS. SOX9 binds AACAAT-centered DNA motifs via its HMG-box domain, bends DNA, and recruits co-activators CBP/p300 and TIP60. It functions exclusively in the nucleus with nuclear localization and export signals. Post-translational modifications including phosphorylation, acetylation, and sumoylation regulate its activity. While SOX9 has additional developmental roles in sex determination, heart valve, kidney, and other epithelial programs, its core molecular functions center on transcriptional activation in cartilage and glial lineages.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 is a bona fide RNA Pol II transcription factor with experimentally validated DNA-binding and transactivation domains (deep research, UniProt). It binds the AACAAT motif via HMG-box and activates transcription of cartilage and other target genes.
Reason: This is a core molecular function of SOX9. The IBA annotation correctly captures SOX9's role as an RNA Pol II-specific transcription factor, supported by extensive experimental evidence showing DNA binding, transactivation, and regulation of Pol II-transcribed genes.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 is a human SOXE-family transcription factor essential for lineage specification... binds AACAAT-centered motifs via its HMG-box... recruits co-activators CBP/p300 and TIP60
file:human/SOX9/SOX9-deep-research-falcon.md
model: Edison Scientific Literature
GO:0002009 morphogenesis of an epithelium
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: SOX9 regulates epithelial morphogenesis in multiple organs including lung, kidney, intestine, and prostate. Deep research notes roles in lung epithelium during branching morphogenesis and kidney epithelial branching.
Reason: While well-supported, epithelial morphogenesis represents peripheral developmental processes rather than the core chondrogenic and gliogenic transcription factor functions of SOX9. This is a pleiotropic effect.
Supporting Evidence:
SOX9-deep-research-falcon.md
involved in the lung epithelium during branching morphogenesis... Controls epithelial branching during kidney development
GO:0005634 nucleus
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 functions in the nucleus with validated nuclear localization signals and nuclear export signals. UniProt describes nuclear localization, and deep research confirms nuclear function.
Reason: Nuclear localization is essential for SOX9's transcription factor function. Multiple lines of evidence support this including NLS/NES identification and experimental demonstration of nuclear localization.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 harbors nuclear localization and export signals... SOX9 functions in the nucleus
P48436.uniprot.txt
SUBCELLULAR LOCATION: Nucleus
GO:0007507 heart development
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: SOX9 is involved in heart valve development and aortic valve morphogenesis with IDA evidence (PMID:22110751). GOA file shows multiple heart-related annotations.
Reason: Heart development is a legitimate but peripheral function of SOX9. The core functions are chondrogenesis and gliogenesis. Heart valve development is a pleiotropic effect.
Supporting Evidence:
SOX9-goa.tsv
GO:0003180 aortic valve morphogenesis biological_process ECO:0000314 IDA PMID:22110751
GO:0000122 negative regulation of transcription by RNA polymerase II
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 can act as both activator and repressor. IMP evidence (PMID:24014021, PMID:29503843) shows SOX9 can negatively regulate transcription. Deep research notes SOX9 antagonizes beta-catenin.
Reason: SOX9 has documented repressive functions including inhibition of osteoblast genes and antagonism of beta-catenin signaling. This is part of its core regulatory mechanism in maintaining chondrocyte identity.
Supporting Evidence:
SOX9-deep-research-falcon.md
Antagonizes β-catenin in chondrocytes... prevents osteoblastic differentiation of chondrocytes by lowering beta-catenin (CTNNB1) signaling
SOX9-goa.tsv
GO:0000122 negative regulation of transcription by RNA polymerase II biological_process ECO:0000314 IDA PMID:29503843
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 binds to enhancer and promoter regions with sequence specificity. Deep research describes binding to AACAAT-centered motifs in enhancers and super-enhancers.
Reason: This is a core molecular function. SOX9 recognizes specific DNA sequences via its HMG-box domain and binds to cis-regulatory regions to activate transcription. Well-supported by experimental evidence.
Supporting Evidence:
SOX9-deep-research-falcon.md
Specifically binds the 5'-ACAAAG-3' DNA motif present in enhancers and super-enhancers
SOX9-goa.tsv
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding molecular_function ECO:0000314 IDA PMID:22110751
GO:0002062 chondrocyte differentiation
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 is the master regulator of chondrocyte differentiation. Deep research and UniProt extensively document this role with multiple IDA/IMP evidence codes.
Reason: This is arguably THE core biological process for SOX9. It is absolutely required for chondrogenesis and is the most well-characterized function of SOX9. Extensively validated experimentally.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 is a human SOXE-family transcription factor essential for lineage specification... orchestrate chondrogenesis
P48436.uniprot.txt
Transcription factor that plays a key role in chondrocytes differentiation and skeletal development
GO:0032332 positive regulation of chondrocyte differentiation
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 promotes chondrocyte differentiation with multiple IDA/IMP evidence codes (PMID:21401405, PMID:20676705). This is a more specific term capturing SOX9's role as a positive regulator.
Reason: This is core function. SOX9 positively drives chondrocyte differentiation through direct transcriptional activation of cartilage genes and is required for multiple stages of chondrogenesis.
Supporting Evidence:
SOX9-goa.tsv
GO:0032332 positive regulation of chondrocyte differentiation biological_process ECO:0000314 IDA PMID:21401405
GO:0048709 oligodendrocyte differentiation
IBA
GO_REF:0000033 		ACCEPT
Summary: SOX9 promotes oligodendrocyte differentiation and glial fate specification. This is a critical function in neural development where SOX9 promotes glial over neuronal fates.
Reason: This is a CORE function for the NEURON_DEVELOPMENT project context. SOX9 is essential for oligodendrocyte lineage specification and is the glial counterpart to proneural factors. This is NOT a peripheral function but rather one of SOX9's two major core roles (cartilage AND glia).
Supporting Evidence:
SOX9-deep-research-falcon.md
GLIOGENESIS/OLIGODENDROCYTE DIFFERENTIATION - important for glial fate specification
GO:0003677 DNA binding
IEA
GO_REF:0000120 		ACCEPT
Summary: SOX9 binds DNA via its HMG-box domain. This is a well-established molecular function but is somewhat generic compared to the sequence-specific binding terms.
Reason: DNA binding is a fundamental molecular function of SOX9. While more specific terms exist (sequence-specific binding), this parent term is also accurate and appropriate.
Supporting Evidence:
P48436.uniprot.txt
DNA_BIND 105..173 /note='HMG box'
GO:0005634 nucleus
IEA
GO_REF:0000120 		ACCEPT
Summary: Duplicate of earlier nucleus annotation. Same evidence and conclusion.
Reason: Duplicate annotation with IEA evidence. Nuclear localization is well-established.
Supporting Evidence:
P48436.uniprot.txt
SUBCELLULAR LOCATION: Nucleus
GO:0030154 cell differentiation
IEA
GO_REF:0000043 		ACCEPT
Summary: SOX9 is involved in differentiation of multiple cell types including chondrocytes, glia, Sertoli cells, and various epithelial cells. This is a very broad parent term.
Reason: While generic, this term is accurate. SOX9 drives differentiation programs in multiple lineages. More specific child terms are preferred but this parent term is not incorrect.
Supporting Evidence:
P48436.uniprot.txt
Also acts as a regulator of proliferation and differentiation in epithelial stem/progenitor cells
GO:0045893 positive regulation of DNA-templated transcription
IEA
GO_REF:0000117 		ACCEPT
Summary: SOX9 activates transcription as documented extensively. This is a parent term less specific than the RNA Pol II terms but still accurate.
Reason: This broad term accurately captures SOX9's transactivation function. More specific RNA Pol II terms are preferred but this is not incorrect.
Supporting Evidence:
SOX9-deep-research-falcon.md
recruits co-activators CBP/p300 and TIP60... promotes expression of genes important for chondrogenesis
GO:1990837 sequence-specific double-stranded DNA binding
IEA
GO_REF:0000117 		ACCEPT
Summary: SOX9 binds double-stranded DNA at specific sequences via its HMG-box domain. IDA evidence exists (PMID:28473536).
Reason: This accurately describes SOX9's DNA-binding mode. The HMG-box recognizes specific sequences in double-stranded DNA and bends it.
Supporting Evidence:
SOX9-goa.tsv
GO:1990837 sequence-specific double-stranded DNA binding molecular_function ECO:0000314 IDA PMID:28473536
GO:0005515 protein binding
IPI
PMID:12810722
A SOX9 defect of calmodulin-dependent nuclear import in camp... 		REMOVE
Summary: Generic protein binding term from IPI evidence. SOX9 interacts with many partners including SOX5/6, CBP/p300, beta-catenin, but this term lacks specificity.
Reason: Per guidelines, avoid generic "protein binding" annotations as they don't convey informative molecular function. More specific binding terms (e.g., transcription co-activator binding) would be better if available.
Supporting Evidence:
CLAUDE.md
Avoid the term 'protein binding', this doesn't tell us anything about the actual function
PMID:12810722
2003 Jun 16. A SOX9 defect of calmodulin-dependent nuclear import in campomelic dysplasia/autosomal sex reversal.
GO:0005515 protein binding
IPI
PMID:21346191
Arid5a cooperates with Sox9 to stimulate chondrocyte-specifi... 		REMOVE
Summary: Duplicate generic protein binding annotation from different reference.
Reason: Same rationale as previous protein binding annotation. Generic and uninformative for molecular function.
Supporting Evidence:
CLAUDE.md
Avoid the term 'protein binding', this doesn't tell us anything about the actual function
PMID:21346191
2011 Feb 23. Arid5a cooperates with Sox9 to stimulate chondrocyte-specific transcription.
GO:0000976 transcription cis-regulatory region binding
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 binds to enhancers and promoters. This is a parent term to the more specific RNA Pol II cis-regulatory region binding.
Reason: Accurate term capturing SOX9's binding to regulatory regions. More specific child terms exist but this is appropriate.
Supporting Evidence:
SOX9-deep-research-falcon.md
binds the DNA minor groove... engages enhancer architectures
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IEA
GO_REF:0000107 		ACCEPT
Summary: Duplicate of earlier IBA annotation for same term. Same evidence supports.
Reason: Duplicate but accurate annotation of core molecular function.
Supporting Evidence:
SOX9-deep-research-falcon.md
Specifically binds the 5'-ACAAAG-3' DNA motif present in enhancers and super-enhancers
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific
IEA
GO_REF:0000107 		ACCEPT
Summary: Duplicate of first IBA annotation. Multiple evidence codes support.
Reason: Core molecular function, well-supported.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 is a human SOXE-family transcription factor
GO:0000987 cis-regulatory region sequence-specific DNA binding
IEA
GO_REF:0000120 		ACCEPT
Summary: Another term for sequence-specific binding to regulatory regions. Slight variation in term hierarchy from GO:0000978.
Reason: Accurate molecular function term. While overlapping with other DNA-binding terms, this captures the regulatory region specificity.
Supporting Evidence:
SOX9-deep-research-falcon.md
binds AACAAT-centered motifs via its HMG-box
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IEA
GO_REF:0000120 		ACCEPT
Summary: SOX9 has transcriptional activator activity with documented transactivation domains (TAM and TAC). Multiple IDA evidence codes exist.
Reason: Core molecular function. SOX9 is primarily a transcriptional activator, though it can also repress. Activator function is well-documented.
Supporting Evidence:
P48436.uniprot.txt
The transactivation domains TAM and TAC (for transactivation domain in the middle and at the C-terminus, respectively)
SOX9-goa.tsv
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific molecular_function ECO:0000314 IDA PMID:21367821
GO:0001503 ossification
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in skeletal development and endochondral ossification, where it regulates the cartilage template that is replaced by bone.
Reason: While SOX9 affects ossification (primarily by regulating the cartilage template for endochondral bone formation), this is a consequence of its chondrogenic function rather than a distinct core role. The core function is chondrogenesis.
Supporting Evidence:
P48436.uniprot.txt
maintains chondrocyte columnar proliferation, delays prehypertrophy and then prevents osteoblastic differentiation
GO:0001658 branching involved in ureteric bud morphogenesis
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 regulates kidney development including ureteric bud branching.
Reason: Kidney development is a peripheral developmental role, not part of the core cartilage/glial functions. Pleiotropic effect.
Supporting Evidence:
SOX9-deep-research-falcon.md
Controls epithelial branching during kidney development
GO:0001894 tissue homeostasis
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 plays roles in maintaining tissue homeostasis in intestinal epithelium and other tissues.
Reason: Tissue homeostasis represents peripheral maintenance functions rather than core transcription factor activities in cartilage and glial development.
Supporting Evidence:
SOX9-goa.tsv
GO:0060729 intestinal epithelial structure maintenance biological_process
GO:0002062 chondrocyte differentiation
IEA
GO_REF:0000107 		ACCEPT
Summary: Duplicate of earlier IBA annotation for chondrocyte differentiation.
Reason: Core function, multiple evidence codes support.
Supporting Evidence:
SOX9-deep-research-falcon.md
master regulator of chondrocyte differentiation
GO:0002683 negative regulation of immune system process
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 may have immunomodulatory effects in certain contexts, but this is not well-documented as a primary function.
Reason: Immune regulation is a peripheral effect, not related to core chondrogenic or gliogenic functions. Likely context-dependent pleiotropic effect.
GO:0003170 heart valve development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in heart valve development with experimental evidence.
Reason: Heart valve development is peripheral to core functions.
Supporting Evidence:
SOX9-goa.tsv
GO:0003180 aortic valve morphogenesis biological_process ECO:0000314 IDA PMID:22110751
GO:0003415 chondrocyte hypertrophy
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 regulates chondrocyte hypertrophy. UniProt notes SOX9 is required for chondrocyte hypertrophy both indirectly and directly.
Reason: Chondrocyte hypertrophy is part of SOX9's core chondrogenic program. This is a specific stage of chondrocyte maturation that SOX9 controls.
Supporting Evidence:
P48436.uniprot.txt
Also required for chondrocyte hypertrophy, both indirectly, by keeping the lineage fate of chondrocytes, and directly, by remaining present in upper hypertrophic cells
GO:0003430 growth plate cartilage chondrocyte growth
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 maintains chondrocyte proliferation in growth plate cartilage as part of its chondrogenic program.
Reason: Growth plate chondrocyte regulation is part of SOX9's core chondrogenic function. This represents a specific developmental stage in cartilage biology.
Supporting Evidence:
P48436.uniprot.txt
maintains chondrocyte columnar proliferation
GO:0003700 DNA-binding transcription factor activity
IEA
GO_REF:0000120 		ACCEPT
Summary: General parent term for transcription factor activity. Less specific than RNA Pol II-specific terms.
Reason: Accurate but broad molecular function term. More specific child terms are preferred but this is not incorrect.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 is a human SOXE-family transcription factor
GO:0005667 transcription regulator complex
IEA
GO_REF:0000120 		ACCEPT
Summary: SOX9 forms complexes with partner proteins including SOX5/6, CBP/p300. It can also homodimerize.
Reason: SOX9 functions as part of transcriptional regulatory complexes, cooperating with SOX5/6 on paired SOX sites and recruiting coactivators. This is accurate.
Supporting Evidence:
SOX9-deep-research-falcon.md
frequently in cooperation with SOX5/6 on paired SOX sites
P48436.uniprot.txt
Homodimer; homodimerization is required for activity
GO:0007165 signal transduction
IEA
GO_REF:0000107 		MARK AS OVER ANNOTATED
Summary: Extremely broad term. SOX9 responds to and mediates signaling pathways like BMP, TGF-beta, but this term is too generic.
Reason: This term is overly broad and uninformative. SOX9 participates in specific signaling contexts but "signal transduction" as a general term doesn't capture its function meaningfully.
GO:0007173 epidermal growth factor receptor signaling pathway
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in EGFR signaling in urothelial and other epithelial contexts. Deep research mentions EGFR-ERK-SOX9 cascade.
Reason: EGFR pathway involvement is context-specific (urothelium, epithelial regeneration) and peripheral to core functions. Not part of cartilage/glial programs.
Supporting Evidence:
SOX9-deep-research-falcon.md
An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer
GO:0007417 central nervous system development
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 promotes glial fate specification and oligodendrocyte differentiation in the CNS. This is one of its core functions.
Reason: CNS development via gliogenesis is a CORE function of SOX9 in the NEURON_DEVELOPMENT project context. SOX9 promotes glial over neuronal fates.
Supporting Evidence:
SOX9-deep-research-falcon.md
GLIOGENESIS/OLIGODENDROCYTE DIFFERENTIATION - important for glial fate specification
GO:0008013 beta-catenin binding
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 interacts with beta-catenin to antagonize Wnt signaling in chondrocytes. This is a specific and informative binding term.
Reason: Beta-catenin binding is a specific molecular function relevant to SOX9's mechanism of action. Unlike generic "protein binding," this term conveys functional information about SOX9's antagonism of Wnt signaling.
Supporting Evidence:
SOX9-deep-research-falcon.md
Antagonizes β-catenin in chondrocytes
P48436.uniprot.txt
Interacts with beta-catenin (CTNNB1); inhibiting CTNNB1 activity by competing with the binding sites of TCF/LEF within CTNNB1
GO:0010467 gene expression
IEA
GO_REF:0000107 		MARK AS OVER ANNOTATED
Summary: Extremely generic term for any gene expression regulation.
Reason: Too broad to be informative. More specific terms about transcriptional regulation better capture SOX9's function.
GO:0010628 positive regulation of gene expression
IEA
GO_REF:0000107 		ACCEPT
Summary: Slightly more specific than gene expression but still quite broad. Has IDA evidence (PMID:24681825).
Reason: While broad, this accurately captures SOX9's role as a transcriptional activator. More specific terms are preferred but this is acceptable.
Supporting Evidence:
SOX9-goa.tsv
GO:0010628 positive regulation of gene expression biological_process ECO:0000314 IDA PMID:24681825
GO:0030279 negative regulation of ossification
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 delays ossification by maintaining cartilage and preventing premature osteoblast differentiation. Has IDA evidence (PMID:29503843).
Reason: This is part of SOX9's core chondrogenic program. SOX9 blocks osteoblast differentiation to maintain chondrocyte identity, which delays ossification.
Supporting Evidence:
P48436.uniprot.txt
prevents osteoblastic differentiation of chondrocytes by lowering beta-catenin (CTNNB1) signaling
SOX9-goa.tsv
GO:0030279 negative regulation of ossification biological_process ECO:0000314 IDA PMID:29503843
GO:0030850 prostate gland development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is expressed in prostate development with IEP evidence.
Reason: Prostate development is a peripheral epithelial developmental role, not core cartilage/glial function.
Supporting Evidence:
SOX9-goa.tsv
GO:0030850 prostate gland development biological_process ECO:0000270 IEP PMID:20103652
GO:0030879 mammary gland development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 plays roles in mammary gland epithelial development.
Reason: Peripheral epithelial developmental function.
GO:0030903 notochord development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in notochord development.
Reason: Notochord development is a developmental process but peripheral to core cartilage/glial functions.
GO:0032332 positive regulation of chondrocyte differentiation
IEA
GO_REF:0000107 		ACCEPT
Summary: Duplicate of earlier IBA annotation for same term.
Reason: Core function with multiple evidence codes.
Supporting Evidence:
SOX9-deep-research-falcon.md
master regulator of chondrocyte differentiation
GO:0043425 bHLH transcription factor binding
IEA
GO_REF:0000107 		UNDECIDED
Summary: SOX9 may interact with bHLH transcription factors in certain contexts, but this is not well-documented as a major interaction.
Reason: Unclear if this represents a significant molecular function for SOX9. Would need to review evidence for specific bHLH factor interactions relevant to SOX9's core functions.
GO:0043565 sequence-specific DNA binding
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 binds DNA in sequence-specific manner via AACAAT motif recognition. Has IDA evidence (PMID:31194875).
Reason: Core molecular function, well-supported.
Supporting Evidence:
SOX9-deep-research-falcon.md
binds AACAAT-centered motifs via its HMG-box
SOX9-goa.tsv
GO:0043565 sequence-specific DNA binding molecular_function ECO:0000314 IDA PMID:31194875
GO:0045668 negative regulation of osteoblast differentiation
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 blocks osteoblast differentiation to maintain chondrocyte identity. Has ISS evidence.
Reason: This is part of SOX9's core mechanism for maintaining chondrocyte fate. SOX9 antagonizes osteoblast genes and beta-catenin to prevent osteogenesis.
Supporting Evidence:
P48436.uniprot.txt
prevents osteoblastic differentiation of chondrocytes
GO:0045944 positive regulation of transcription by RNA polymerase II
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 activates RNA Pol II transcription with multiple IDA/IMP evidence codes.
Reason: Core transcriptional activator function, well-supported.
Supporting Evidence:
SOX9-goa.tsv
GO:0045944 positive regulation of transcription by RNA polymerase II biological_process ECO:0000314 IDA PMID:22110751
GO:0046322 negative regulation of fatty acid oxidation
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Deep research mentions low lipid levels promote SOX9 expression and chondrogenic commitment, with SOX9 suppressing fatty acid oxidation.
Reason: While documented, this represents a metabolic coupling to chondrogenic commitment rather than a core transcription factor function. Peripheral metabolic effect.
Supporting Evidence:
P48436.uniprot.txt
when lipids levels are low, FOXO (FOXO1 and FOXO3) transcription factors promote expression of SOX9, which induces chondrogenic commitment and suppresses fatty acid oxidation
GO:0051216 cartilage development
IEA
GO_REF:0000120 		ACCEPT
Summary: Broad parent term for cartilage development. SOX9 is the master regulator of cartilage development.
Reason: This is a core biological process for SOX9. While less specific than chondrocyte differentiation, it accurately captures SOX9's role in cartilage biology.
Supporting Evidence:
SOX9-deep-research-falcon.md
orchestrate chondrogenesis
GO:0060009 Sertoli cell development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is critical for Sertoli cell development and sex determination.
Reason: Sex determination and Sertoli cell development are important biological functions of SOX9 but peripheral to the core cartilage/glial roles.
Supporting Evidence:
SOX9-deep-research-falcon.md
Sex determination (testis development, Sertoli cell differentiation)
GO:0060174 limb bud formation
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in limb skeletal development.
Reason: Limb development involves SOX9's chondrogenic function but this specific term represents a developmental context rather than core molecular function.
GO:0070168 negative regulation of biomineral tissue development
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 inhibits bone mineralization, maintaining cartilage. Has IDA evidence (PMID:22110751).
Reason: This is part of SOX9's mechanism for maintaining cartilage identity by preventing premature mineralization and osteoblast differentiation.
Supporting Evidence:
SOX9-goa.tsv
GO:0070168 negative regulation of biomineral tissue development biological_process ECO:0000314 IDA PMID:22110751
GO:0070371 ERK1 and ERK2 cascade
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in ERK signaling cascades in epithelial contexts.
Reason: ERK cascade involvement is context-specific (EGFR-ERK-SOX9 in urothelium) and peripheral to core functions.
Supporting Evidence:
SOX9-deep-research-falcon.md
An EGFR-ERK-SOX9 signaling cascade
GO:0070542 response to fatty acid
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Related to the lipid/fatty acid oxidation effects noted earlier.
Reason: Peripheral metabolic response, not core transcription factor function.
GO:0071260 cellular response to mechanical stimulus
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 may respond to mechanical stimuli in cartilage contexts.
Reason: While potentially relevant to cartilage biology, this is a contextual response rather than core molecular function.
GO:0071364 cellular response to epidermal growth factor stimulus
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: Related to EGFR signaling pathway involvement noted earlier.
Reason: Context-specific response in epithelial tissues, not core function.
GO:0071504 cellular response to heparin
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 may respond to heparin in certain contexts.
Reason: Highly specific contextual response, unclear relevance to core functions.
GO:0071560 cellular response to transforming growth factor beta stimulus
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 responds to TGF-beta signaling which regulates chondrogenesis. Has IDA evidence (PMID:21401405).
Reason: TGF-beta signaling is central to chondrogenesis regulation. SOX9's response to TGF-beta is part of its core chondrogenic program.
Supporting Evidence:
SOX9-goa.tsv
GO:0071560 cellular response to transforming growth factor beta stimulus biological_process ECO:0000314 IDA PMID:21401405
GO:0071599 otic vesicle development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 is involved in inner ear development.
Reason: Peripheral developmental process in sensory organ development.
GO:0072034 renal vesicle induction
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 regulates kidney development including renal vesicle formation.
Reason: Peripheral kidney development function.
GO:0072170 metanephric tubule development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 involved in kidney tubule development.
Reason: Peripheral kidney development function.
GO:0072190 ureter urothelium development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 regulates urothelial development.
Reason: Peripheral epithelial development.
GO:0090184 positive regulation of kidney development
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: SOX9 promotes kidney development.
Reason: Peripheral developmental function.
GO:0090190 positive regulation of branching involved in ureteric bud morphogenesis
IEA
GO_REF:0000107 		KEEP AS NON CORE
Summary: More specific kidney branching term.
Reason: Peripheral kidney development function.
GO:0097157 pre-mRNA intronic binding
IEA
GO_REF:0000107 		UNDECIDED
Summary: Deep research notes SOX9 regulates alternative splicing in beta cells, which may involve intronic binding.
Reason: This is an interesting molecular function related to the alternative splicing role discovered in beta cells, but unclear if this is broadly relevant to SOX9's core functions.
Supporting Evidence:
SOX9-deep-research-falcon.md
SOX9 persists in mature β cells and regulates alternative splicing programs
GO:1904864 negative regulation of beta-catenin-TCF complex assembly
IEA
GO_REF:0000107 		ACCEPT
Summary: SOX9 antagonizes beta-catenin by competing for binding sites with TCF/LEF factors.
Reason: This is a specific molecular mechanism by which SOX9 antagonizes Wnt signaling to maintain chondrocyte identity. Part of core chondrogenic function.
Supporting Evidence:
P48436.uniprot.txt
Interacts with beta-catenin (CTNNB1); inhibiting CTNNB1 activity by competing with the binding sites of TCF/LEF within CTNNB1
GO:0005654 nucleoplasm
IDA
GO_REF:0000052 		ACCEPT
Summary: SOX9 localizes to nucleoplasm as a nuclear transcription factor.
Reason: Nucleoplasm is the appropriate sub-nuclear compartment for transcription factors. More specific than just "nucleus."
Supporting Evidence:
SOX9-goa.tsv
GO:0005654 nucleoplasm cellular_component ECO:0000314 IDA GO_REF:0000052
GO:0000122 negative regulation of transcription by RNA polymerase II
IMP
PMID:24014021
miR-1247 functions by targeting cartilage transcription fact... 		ACCEPT
Summary: Duplicate of earlier IBA annotation with additional IMP evidence.
Reason: SOX9 has documented repressive functions. Multiple evidence codes support.
Supporting Evidence:
SOX9-goa.tsv
GO:0000122 negative regulation of transcription by RNA polymerase II biological_process ECO:0000315 IMP PMID:24014021
PMID:24014021
2013 Sep 6. miR-1247 functions by targeting cartilage transcription factor SOX9.
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IDA
PMID:21367821
Sox9 sustains chondrocyte survival and hypertrophy in part t... 		ACCEPT
Summary: Duplicate with IDA evidence from different publication.
Reason: Core molecular function with strong experimental support.
Supporting Evidence:
PMID:21367821
Sox9 sustains chondrocyte survival and hypertrophy in part through Pik3ca-Akt pathways.
GO:0045944 positive regulation of transcription by RNA polymerase II
IMP
PMID:21367821
Sox9 sustains chondrocyte survival and hypertrophy in part t... 		ACCEPT
Summary: Duplicate with IMP evidence.
Reason: Core function with experimental evidence.
Supporting Evidence:
PMID:21367821
Sox9 sustains chondrocyte survival and hypertrophy in part through Pik3ca-Akt pathways.
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IDA
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease. 		ACCEPT
Summary: Duplicate with IDA evidence from heart valve study.
Reason: Core molecular function.
Supporting Evidence:
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IDA
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease. 		ACCEPT
Summary: Another duplicate with IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
GO:0003180 aortic valve morphogenesis
IDA
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease. 		KEEP AS NON CORE
Summary: Specific heart valve development term with experimental evidence.
Reason: Heart valve morphogenesis is peripheral to core cartilage/glial functions.
Supporting Evidence:
SOX9-goa.tsv
GO:0003180 aortic valve morphogenesis biological_process ECO:0000314 IDA PMID:22110751
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
GO:0045944 positive regulation of transcription by RNA polymerase II
IDA
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease. 		ACCEPT
Summary: Another duplicate from heart valve study.
Reason: Core function.
Supporting Evidence:
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
GO:0070168 negative regulation of biomineral tissue development
IDA
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease. 		ACCEPT
Summary: Duplicate of earlier annotation with IDA evidence from heart valve study.
Reason: Part of core mechanism for maintaining cartilage over bone.
Supporting Evidence:
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific
IDA
PMID:20484372
The dimerization domain of SOX9 is required for transcriptio... 		ACCEPT
Summary: Multiple IDA evidence codes from different publications.
Reason: Core molecular function.
Supporting Evidence:
PMID:20484372
May 19. The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific
IDA
PMID:21412441
Failure of SOX9 regulation in 46XY disorders of sex developm... 		ACCEPT
Summary: Another IDA evidence from sex determination study.
Reason: Core molecular function.
Supporting Evidence:
PMID:21412441
Failure of SOX9 regulation in 46XY disorders of sex development with SRY, SOX9 and SF1 mutations.
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IDA
PMID:20484372
The dimerization domain of SOX9 is required for transcriptio... 		ACCEPT
Summary: Duplicate IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:20484372
May 19. The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IDA
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		ACCEPT
Summary: Another IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:1902894 negative regulation of miRNA transcription
IDA
PMID:26687115
The microRNA-29 family in cartilage homeostasis and osteoart... 		KEEP AS NON CORE
Summary: SOX9 regulates miRNA expression in cartilage contexts.
Reason: While experimentally validated, miRNA regulation is a secondary regulatory mechanism rather than core transcription factor function.
Supporting Evidence:
SOX9-goa.tsv
GO:1902894 negative regulation of miRNA transcription biological_process ECO:0000314 IDA PMID:26687115
PMID:26687115
2015 Dec 19. The microRNA-29 family in cartilage homeostasis and osteoarthritis.
GO:1990837 sequence-specific double-stranded DNA binding
IDA
PMID:28473536
Impact of cytosine methylation on DNA binding specificities ... 		ACCEPT
Summary: Duplicate of earlier IEA annotation with IDA evidence.
Reason: Core molecular function with experimental support.
Supporting Evidence:
PMID:28473536
Impact of cytosine methylation on DNA binding specificities of human transcription factors.
GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific
IDA
PMID:31194875
The SOXE transcription factors-SOX8, SOX9 and SOX10-share a ... 		ACCEPT
Summary: More IDA evidence from transactivation domain study.
Reason: Core molecular function.
Supporting Evidence:
PMID:31194875
The SOXE transcription factors-SOX8, SOX9 and SOX10-share a bi-partite transactivation mechanism.
GO:0043565 sequence-specific DNA binding
IDA
PMID:31194875
The SOXE transcription factors-SOX8, SOX9 and SOX10-share a ... 		ACCEPT
Summary: Duplicate with IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:31194875
The SOXE transcription factors-SOX8, SOX9 and SOX10-share a bi-partite transactivation mechanism.
GO:0002062 chondrocyte differentiation
ISS
GO_REF:0000024 		ACCEPT
Summary: Multiple evidence codes for this core function.
Reason: Core function with ISS evidence.
GO:0003430 growth plate cartilage chondrocyte growth
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate with ISS evidence.
Reason: Part of core chondrogenic program.
GO:0045668 negative regulation of osteoblast differentiation
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate with ISS evidence.
Reason: Core mechanism for maintaining chondrocyte identity.
GO:0046322 negative regulation of fatty acid oxidation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate with ISS evidence.
Reason: Peripheral metabolic effect.
GO:0070542 response to fatty acid
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate with ISS evidence.
Reason: Peripheral metabolic response.
GO:0000785 chromatin
ISA
GO_REF:0000113 		ACCEPT
Summary: SOX9 binds chromatin as a transcription factor. Deep research notes it can act as a pioneer factor at super-enhancers.
Reason: Chromatin localization is appropriate for a transcription factor that engages enhancers and promoters.
Supporting Evidence:
SOX9-deep-research-falcon.md
Can act as a pioneer factor at super-enhancers
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific
ISA
GO_REF:0000113 		ACCEPT
Summary: ISA evidence from TFClass database.
Reason: Core molecular function supported by database annotation.
GO:0010628 positive regulation of gene expression
IDA
PMID:24681825
The NLR-related protein NWD1 is associated with prostate can... 		ACCEPT
Summary: Duplicate with IDA evidence.
Reason: Core transcriptional activator function.
Supporting Evidence:
PMID:24681825
The NLR-related protein NWD1 is associated with prostate cancer and modulates androgen receptor signaling.
GO:0005515 protein binding
IPI
PMID:28263186
Loss of DDRGK1 modulates SOX9 ubiquitination in spondyloepim... 		REMOVE
Summary: Another generic protein binding annotation (DDRGK1 interaction).
Reason: Generic protein binding term. While DDRGK1 interaction affects SOX9 ubiquitination, the generic term doesn't convey functional information.
Supporting Evidence:
PMID:28263186
Mar 6. Loss of DDRGK1 modulates SOX9 ubiquitination in spondyloepimetaphyseal dysplasia.
GO:0005634 nucleus
ISS
GO_REF:0000024 		ACCEPT
Summary: Multiple evidence codes for nuclear localization.
Reason: Well-established cellular component.
GO:0005634 nucleus
IDA
PMID:26634652
Valve Endothelial Cell-Derived Tgfβ1 Signaling Promotes Nucl... 		ACCEPT
Summary: IDA evidence for nuclear localization.
Reason: Well-established with experimental evidence.
Supporting Evidence:
PMID:26634652
Valve Endothelial Cell-Derived Tgfβ1 Signaling Promotes Nuclear Localization of Sox9 in Interstitial Cells Associated With Attenuated Calcification.
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IDA
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		ACCEPT
Summary: Another IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:0061036 positive regulation of cartilage development
IDA
PMID:29503843
Sox9 augments BMP2-induced chondrogenic differentiation by d... 		ACCEPT
Summary: SOX9 promotes cartilage development with IDA evidence.
Reason: This is essentially a parent term encompassing SOX9's chondrogenic functions. Core function.
Supporting Evidence:
SOX9-goa.tsv
GO:0061036 positive regulation of cartilage development biological_process ECO:0000314 IDA PMID:29503843
PMID:29503843
Nov 2. Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs).
GO:1902732 positive regulation of chondrocyte proliferation
IDA
PMID:29503843
Sox9 augments BMP2-induced chondrogenic differentiation by d... 		ACCEPT
Summary: SOX9 promotes chondrocyte proliferation in growth plate.
Reason: Part of core chondrogenic program maintaining columnar proliferation.
Supporting Evidence:
P48436.uniprot.txt
maintains chondrocyte columnar proliferation
PMID:29503843
Nov 2. Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs).
GO:0030279 negative regulation of ossification
IDA
PMID:29503843
Sox9 augments BMP2-induced chondrogenic differentiation by d... 		ACCEPT
Summary: Duplicate with IDA evidence.
Reason: Part of core mechanism.
Supporting Evidence:
PMID:29503843
Nov 2. Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs).
GO:0000122 negative regulation of transcription by RNA polymerase II
IDA
PMID:29503843
Sox9 augments BMP2-induced chondrogenic differentiation by d... 		ACCEPT
Summary: More IDA evidence for repressive function.
Reason: Documented repressive capability.
Supporting Evidence:
PMID:29503843
Nov 2. Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs).
GO:0001502 cartilage condensation
ISS
GO_REF:0000024 		ACCEPT
Summary: SOX9 is absolutely required for precartilaginous condensation, the first step in chondrogenesis.
Reason: Cartilage condensation is the initial step in chondrogenesis where SOX9 is absolutely required. This is core chondrogenic function.
Supporting Evidence:
P48436.uniprot.txt
Absolutely required for precartilaginous condensation, the first step in chondrogenesis
GO:0014036 neural crest cell fate specification
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 is involved in neural crest development.
Reason: Neural crest fate specification is peripheral to core cartilage/glial functions. While SOX9 may affect neural crest, this is not its primary role.
GO:0071773 cellular response to BMP stimulus
ISS
GO_REF:0000024 		ACCEPT
Summary: SOX9 responds to BMP signaling which regulates chondrogenesis.
Reason: BMP signaling is central to chondrogenesis and SOX9 is a key effector of BMP responses in cartilage differentiation.
Supporting Evidence:
P48436.uniprot.txt
Acts in cooperation with the Hedgehog pathway-dependent GLI (GLI1 and GLI3) transcription factors
GO:0005654 nucleoplasm
TAS
Reactome:R-HSA-5626938 		ACCEPT
Summary: Duplicate nucleoplasm annotation from Reactome.
Reason: Appropriate sub-nuclear compartment.
GO:0005654 nucleoplasm
TAS
Reactome:R-HSA-8985343 		ACCEPT
Summary: Another Reactome TAS annotation for nucleoplasm.
Reason: Appropriate sub-nuclear compartment.
GO:0032332 positive regulation of chondrocyte differentiation
IDA
PMID:21401405
Electroporation-mediated transfer of SOX trio genes (SOX-5, ... 		ACCEPT
Summary: More IDA evidence for core function.
Reason: Core chondrogenic function.
Supporting Evidence:
PMID:21401405
Oct 21. Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.
GO:0061036 positive regulation of cartilage development
IDA
PMID:21401405
Electroporation-mediated transfer of SOX trio genes (SOX-5, ... 		ACCEPT
Summary: Duplicate with IDA evidence.
Reason: Core chondrogenic function.
Supporting Evidence:
PMID:21401405
Oct 21. Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.
GO:0071560 cellular response to transforming growth factor beta stimulus
IDA
PMID:21401405
Electroporation-mediated transfer of SOX trio genes (SOX-5, ... 		ACCEPT
Summary: Duplicate with IDA evidence.
Reason: Part of core chondrogenic signaling response.
Supporting Evidence:
PMID:21401405
Oct 21. Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.
GO:0003415 chondrocyte hypertrophy
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate with ISS evidence.
Reason: Core chondrogenic program.
GO:0003682 chromatin binding
IDA
PMID:20484372
The dimerization domain of SOX9 is required for transcriptio... 		ACCEPT
Summary: SOX9 binds chromatin with IDA evidence.
Reason: Chromatin binding is a specific molecular function relevant to SOX9's role as a transcription factor engaging chromatin.
Supporting Evidence:
SOX9-goa.tsv
GO:0003682 chromatin binding molecular_function ECO:0000314 IDA PMID:20484372
PMID:20484372
May 19. The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
GO:0006334 nucleosome assembly
IDA
PMID:20484372
The dimerization domain of SOX9 is required for transcriptio... 		KEEP AS NON CORE
Summary: PMID:20484372 shows SOX9 dimerization is required for nucleosome assembly during chondrocyte-specific transcription activation.
Reason: While experimentally supported, nucleosome assembly is a chromatin remodeling mechanism rather than a core transcription factor function. It's part of the mechanistic process but peripheral to the primary role.
Supporting Evidence:
SOX9-goa.tsv
GO:0006334 nucleosome assembly biological_process ECO:0000314 IDA PMID:20484372
PMID:20484372
May 19. The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
GO:0006338 chromatin remodeling
IDA
PMID:20484372
The dimerization domain of SOX9 is required for transcriptio... 		KEEP AS NON CORE
Summary: SOX9 is involved in chromatin remodeling at target genes.
Reason: Chromatin remodeling is a mechanistic process supporting transcription activation but not a core defining function of SOX9.
Supporting Evidence:
PMID:20484372
May 19. The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
GO:0007173 epidermal growth factor receptor signaling pathway
ISS
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: Duplicate with ISS evidence.
Reason: Context-specific signaling in epithelial tissues.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:0008284 positive regulation of cell population proliferation
IMP
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvem... 		KEEP AS NON CORE
Summary: SOX9 promotes proliferation in certain contexts (lung adenocarcinoma study).
Reason: While SOX9 does promote chondrocyte proliferation (core function), this generic proliferation term from a cancer study represents peripheral effects rather than the specific chondrocyte proliferation that is core.
Supporting Evidence:
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvement in the regulation of cell growth and tumorigenicity.
GO:0010634 positive regulation of epithelial cell migration
IMP
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: SOX9 promotes epithelial cell migration in urothelial contexts.
Reason: Context-specific epithelial function, not core cartilage/glial role.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:0045892 negative regulation of DNA-templated transcription
IMP
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvem... 		ACCEPT
Summary: General transcriptional repression term with IMP evidence.
Reason: SOX9 has documented repressive functions. More specific RNA Pol II term is preferred but this is acceptable.
Supporting Evidence:
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvement in the regulation of cell growth and tumorigenicity.
GO:0045893 positive regulation of DNA-templated transcription
IMP
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvem... 		ACCEPT
Summary: General transcriptional activation term with IMP evidence.
Reason: SOX9 is primarily a transcriptional activator. More specific RNA Pol II term is preferred but this is acceptable.
Supporting Evidence:
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvement in the regulation of cell growth and tumorigenicity.
GO:0070371 ERK1 and ERK2 cascade
ISS
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Context-specific signaling.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:0071260 cellular response to mechanical stimulus
ISS
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Context-specific response.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:0071364 cellular response to epidermal growth factor stimulus
ISS
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Context-specific response.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:0071504 cellular response to heparin
ISS
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial developm... 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Context-specific response.
Supporting Evidence:
PMID:21512138
Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
GO:2000020 positive regulation of male gonad development
IDA
PMID:21412441
Failure of SOX9 regulation in 46XY disorders of sex developm... 		KEEP AS NON CORE
Summary: SOX9 promotes testis development with IDA evidence.
Reason: Sex determination is an important SOX9 function but peripheral to core cartilage/glial roles.
Supporting Evidence:
PMID:21412441
Failure of SOX9 regulation in 46XY disorders of sex development with SRY, SOX9 and SF1 mutations.
GO:2000741 positive regulation of mesenchymal stem cell differentiation
IDA
PMID:21401405
Electroporation-mediated transfer of SOX trio genes (SOX-5, ... 		ACCEPT
Summary: SOX9 promotes MSC differentiation toward chondrocytes.
Reason: MSC differentiation toward chondrocytes is part of the chondrogenic program. This captures an earlier step in the lineage commitment.
Supporting Evidence:
PMID:21401405
Oct 21. Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.
GO:0000987 cis-regulatory region sequence-specific DNA binding
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate with ISS evidence.
Reason: Core molecular function.
GO:0001502 cartilage condensation
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate ISS evidence.
Reason: Core first step in chondrogenesis.
GO:0001894 tissue homeostasis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Peripheral maintenance function.
GO:0002683 negative regulation of immune system process
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Peripheral immunomodulatory effect.
GO:0003170 heart valve development
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Peripheral developmental function.
GO:0030279 negative regulation of ossification
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate ISS evidence.
Reason: Core mechanism for maintaining cartilage.
GO:0030850 prostate gland development
IEP
PMID:20103652
SOX9 elevation in the prostate promotes proliferation and co... 		KEEP AS NON CORE
Summary: IEP evidence for prostate development.
Reason: Peripheral epithelial development.
Supporting Evidence:
PMID:20103652
2010 Jan 26. SOX9 elevation in the prostate promotes proliferation and cooperates with PTEN loss to drive tumor formation.
GO:0050679 positive regulation of epithelial cell proliferation
IEP
PMID:20103652
SOX9 elevation in the prostate promotes proliferation and co... 		KEEP AS NON CORE
Summary: IEP evidence from prostate study.
Reason: Context-specific epithelial proliferation, not core function.
Supporting Evidence:
PMID:20103652
2010 Jan 26. SOX9 elevation in the prostate promotes proliferation and cooperates with PTEN loss to drive tumor formation.
GO:0070168 negative regulation of biomineral tissue development
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate ISS evidence.
Reason: Core mechanism for maintaining cartilage.
GO:0071347 cellular response to interleukin-1
IEP
PMID:20079164
Interleukin-1 inhibits Sox9 and collagen type II expression ... 		KEEP AS NON CORE
Summary: SOX9 responds to IL-1 in intervertebral disc cells.
Reason: Context-specific response in pathological conditions, not core function.
Supporting Evidence:
PMID:20079164
Interleukin-1 inhibits Sox9 and collagen type II expression via nuclear factor-kappaB in the cultured human intervertebral disc cells.
GO:0001708 cell fate specification
ISS
GO_REF:0000024 		ACCEPT
Summary: SOX9 specifies cell fates including chondrocyte, glial, and Sertoli cell fates.
Reason: Cell fate specification is fundamental to SOX9's function as a lineage-determining transcription factor in chondrocytes and glia. This is core.
Supporting Evidence:
SOX9-deep-research-falcon.md
essential for lineage specification... glial fate specification
GO:0001837 epithelial to mesenchymal transition
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 is involved in EMT in various developmental contexts.
Reason: EMT is a process that occurs in multiple developmental contexts but is not a core defining function of SOX9.
GO:0001942 hair follicle development
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 plays roles in hair follicle development.
Reason: Hair follicle development is peripheral epithelial function noted in deep research as one of multiple other programs.
Supporting Evidence:
SOX9-deep-research-falcon.md
Hair follicle morphogenesis
GO:0002053 positive regulation of mesenchymal cell proliferation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 promotes mesenchymal cell proliferation.
Reason: While related to chondrogenesis (mesenchymal condensation), this generic proliferation term is broader than the specific chondrocyte proliferation that is core.
GO:0003179 heart valve morphogenesis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate ISS evidence for heart valve.
Reason: Peripheral developmental function.
GO:0003203 endocardial cushion morphogenesis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in heart cushion development.
Reason: Peripheral cardiac development function.
GO:0005634 nucleus
IDA
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer... 		ACCEPT
Summary: Multiple IDA evidence codes for nuclear localization.
Reason: Well-established with experimental evidence.
Supporting Evidence:
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.
GO:0007283 spermatogenesis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in spermatogenesis via Sertoli cell function.
Reason: Peripheral reproductive developmental function.
GO:0010564 regulation of cell cycle process
IMP
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer... 		KEEP AS NON CORE
Summary: SOX9 can regulate cell cycle in certain contexts.
Reason: While SOX9 affects proliferation in chondrocytes, this generic cell cycle term is overly broad and not a core defining function.
Supporting Evidence:
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.
GO:0019100 male germ-line sex determination
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 is critical for male sex determination.
Reason: Important but peripheral to core cartilage/glial functions.
GO:0030858 positive regulation of epithelial cell differentiation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 promotes epithelial differentiation in multiple organs.
Reason: Generic epithelial differentiation is peripheral to core functions.
GO:0030916 otic vesicle formation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in inner ear development.
Reason: Peripheral sensory organ development.
GO:0032331 negative regulation of chondrocyte differentiation
ISS
GO_REF:0000024 		ACCEPT
Summary: SOX9 can negatively regulate chondrocyte differentiation at certain stages to maintain progenitor populations.
Reason: This reflects SOX9's context-dependent role in maintaining chondrocyte progenitors versus promoting differentiation. Part of the nuanced chondrogenic program.
GO:0035019 somatic stem cell population maintenance
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 maintains stem cell populations in various tissues.
Reason: While SOX9 can maintain stem/progenitor populations, this generic term doesn't capture the core cartilage/glial functions.
GO:0042127 regulation of cell population proliferation
ISS
GO_REF:0000024 		MARK AS OVER ANNOTATED
Summary: Very generic proliferation regulation term.
Reason: Too generic to be informative. More specific terms about chondrocyte proliferation are preferred.
GO:0042981 regulation of apoptotic process
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 may regulate apoptosis in certain contexts.
Reason: Apoptosis regulation is a peripheral effect, not a core transcription factor function.
GO:0043066 negative regulation of apoptotic process
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 may have anti-apoptotic effects.
Reason: Peripheral effect, not core function.
GO:0045662 negative regulation of myoblast differentiation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 inhibits myoblast differentiation.
Reason: While SOX9 promotes chondrocyte over other mesenchymal fates, myoblast inhibition is a peripheral effect.
GO:0046533 negative regulation of photoreceptor cell differentiation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in retinal development.
Reason: Peripheral retinal development function.
GO:0050679 positive regulation of epithelial cell proliferation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate ISS evidence.
Reason: Context-specific epithelial proliferation.
GO:0050680 negative regulation of epithelial cell proliferation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 can also negatively regulate epithelial proliferation contextually.
Reason: Context-dependent epithelial regulation, peripheral function.
GO:0051216 cartilage development
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate ISS evidence.
Reason: Core chondrogenic function.
GO:0060008 Sertoli cell differentiation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 promotes Sertoli cell differentiation.
Reason: Peripheral sex determination function.
GO:0060041 retina development in camera-type eye
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in retinal development.
Reason: Peripheral sensory organ development.
GO:0060221 retinal rod cell differentiation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: More specific retinal development term.
Reason: Peripheral sensory cell differentiation.
GO:0060517 epithelial cell proliferation involved in prostatic bud elongation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Highly specific prostate development term.
Reason: Very specific peripheral developmental process.
GO:0060729 intestinal epithelial structure maintenance
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 maintains intestinal epithelium.
Reason: Peripheral tissue maintenance function.
GO:0060784 regulation of cell proliferation involved in tissue homeostasis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Generic tissue homeostasis proliferation regulation.
Reason: Peripheral maintenance function.
GO:0061138 morphogenesis of a branching epithelium
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate of earlier epithelial morphogenesis annotation.
Reason: Peripheral epithelial morphogenesis.
GO:0071300 cellular response to retinoic acid
IEP
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer... 		KEEP AS NON CORE
Summary: SOX9 responds to retinoic acid.
Reason: Contextual signaling response, not core function.
Supporting Evidence:
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.
GO:0072289 metanephric nephron tubule formation
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: More specific kidney development term.
Reason: Peripheral kidney development.
GO:0090090 negative regulation of canonical Wnt signaling pathway
ISS
GO_REF:0000024 		ACCEPT
Summary: SOX9 antagonizes Wnt/beta-catenin signaling.
Reason: Wnt/beta-catenin antagonism is a core mechanism by which SOX9 maintains chondrocyte identity and blocks osteoblast differentiation.
Supporting Evidence:
SOX9-deep-research-falcon.md
Antagonizes β-catenin in chondrocytes
GO:0090103 cochlea morphogenesis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: SOX9 involved in inner ear cochlea development.
Reason: Peripheral sensory organ development.
GO:0001501 skeletal system development
IMP
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domai... 		ACCEPT
Summary: Broad term for skeletal development with IMP evidence from foundational SOX9 study.
Reason: Skeletal system development encompasses SOX9's chondrogenic functions. While broad, this is a core developmental process for SOX9.
Supporting Evidence:
SOX9-goa.tsv
GO:0001501 skeletal system development biological_process ECO:0000315 IMP PMID:8640233
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
GO:0003413 chondrocyte differentiation involved in endochondral bone morphogenesis
IMP
PMID:20676705
Generation of transgenic mice for conditional overexpression... 		ACCEPT
Summary: More specific term for chondrocyte differentiation in context of endochondral ossification.
Reason: This captures the specific developmental context where SOX9-driven chondrogenesis creates the cartilage template for bone formation. Core function.
Supporting Evidence:
SOX9-goa.tsv
GO:0003413 chondrocyte differentiation involved in endochondral bone morphogenesis biological_process ECO:0000315 IMP PMID:20676705
PMID:20676705
2010 Jul 30. Generation of transgenic mice for conditional overexpression of Sox9.
GO:0003700 DNA-binding transcription factor activity
IMP
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domai... 		ACCEPT
Summary: IMP evidence from foundational study.
Reason: Core molecular function with experimental evidence.
Supporting Evidence:
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
GO:0005634 nucleus
IDA
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domai... 		ACCEPT
Summary: More IDA evidence for nuclear localization.
Reason: Well-established cellular component.
Supporting Evidence:
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
GO:0008584 male gonad development
IMP
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domai... 		KEEP AS NON CORE
Summary: IMP evidence for testis development.
Reason: Peripheral sex determination function.
Supporting Evidence:
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
GO:0032332 positive regulation of chondrocyte differentiation
IMP
PMID:20676705
Generation of transgenic mice for conditional overexpression... 		ACCEPT
Summary: More IMP evidence for core function.
Reason: Core chondrogenic function.
Supporting Evidence:
PMID:20676705
2010 Jul 30. Generation of transgenic mice for conditional overexpression of Sox9.
GO:0045944 positive regulation of transcription by RNA polymerase II
IDA
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domai... 		ACCEPT
Summary: IDA evidence from foundational study.
Reason: Core transcriptional activator function.
Supporting Evidence:
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
GO:0005634 nucleus
IDA
PMID:18512230
Quantitative assessment of glial cells in the human and guin... 		ACCEPT
Summary: More IDA evidence for nucleus.
Reason: Well-established.
Supporting Evidence:
PMID:18512230
Quantitative assessment of glial cells in the human and guinea pig enteric nervous system with an anti-Sox8/9/10 antibody.
GO:0000987 cis-regulatory region sequence-specific DNA binding
IDA
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kina... 		ACCEPT
Summary: IDA evidence for sequence-specific binding.
Reason: Core molecular function.
Supporting Evidence:
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
GO:0003700 DNA-binding transcription factor activity
IDA
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kina... 		ACCEPT
Summary: More IDA evidence.
Reason: Core molecular function.
Supporting Evidence:
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
GO:0005515 protein binding
IPI
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		REMOVE
Summary: Another generic protein binding (MITF/OTX2 interactions).
Reason: Generic protein binding term, uninformative.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:0005634 nucleus
IDA
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kina... 		ACCEPT
Summary: More IDA evidence.
Reason: Well-established.
Supporting Evidence:
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
GO:0032991 protein-containing complex
IDA
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		MARK AS OVER ANNOTATED
Summary: SOX9 forms complexes with partners. This is a very generic cellular component term.
Reason: Too generic. More specific terms like "transcription regulator complex" better capture SOX9's complex formation.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:0034236 protein kinase A catalytic subunit binding
IPI
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kina... 		ACCEPT
Summary: SOX9 interacts with PKA which phosphorylates it to enhance activity. This is a specific binding term.
Reason: PKA binding and phosphorylation is a specific regulatory mechanism for SOX9 activity. Unlike generic protein binding, this conveys functional information.
Supporting Evidence:
P48436.uniprot.txt
Phosphorylation at Ser-64 and Ser-211 by PKA increases transcriptional activity
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
GO:0045893 positive regulation of DNA-templated transcription
IDA
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kina... 		ACCEPT
Summary: IDA evidence for transcriptional activation.
Reason: Core activator function.
Supporting Evidence:
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
GO:0045944 positive regulation of transcription by RNA polymerase II
IDA
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		ACCEPT
Summary: More IDA evidence.
Reason: Core function.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:0065003 protein-containing complex assembly
IDA
PMID:20530484
SOX9, through interaction with microphthalmia-associated tra... 		KEEP AS NON CORE
Summary: SOX9 assembles into protein complexes.
Reason: While SOX9 does form complexes, this generic assembly term doesn't capture the core transcription factor function.
Supporting Evidence:
PMID:20530484
Epub 2010 Jun 8. SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
GO:0007165 signal transduction
ISS
GO_REF:0000024 		MARK AS OVER ANNOTATED
Summary: Duplicate of earlier very generic signal transduction term.
Reason: Too generic to be informative.
GO:0072034 renal vesicle induction
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate kidney development term.
Reason: Peripheral kidney development.
GO:0090184 positive regulation of kidney development
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate kidney development term.
Reason: Peripheral kidney development.
GO:0090190 positive regulation of branching involved in ureteric bud morphogenesis
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Duplicate kidney branching term.
Reason: Peripheral kidney development.
GO:0008584 male gonad development
IEP
PMID:17848411
Developmental changes in human fetal testicular cell numbers... 		KEEP AS NON CORE
Summary: IEP evidence for testis development.
Reason: Peripheral sex determination function.
Supporting Evidence:
PMID:17848411
Epub 2007 Sep 11. Developmental changes in human fetal testicular cell numbers and messenger ribonucleic acid levels during the second trimester.

References

GO_REF:0000024
Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
GO_REF:0000033
Annotation inferences using phylogenetic trees
GO_REF:0000043
Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
GO_REF:0000052
Gene Ontology annotation based on curation of immunofluorescence data
GO_REF:0000107
Automatic transfer of experimentally verified manual GO annotation data to orthologs using Ensembl Compara
GO_REF:0000113
Gene Ontology annotation of human sequence-specific DNA binding transcription factors (DbTFs) based on the TFClass database
GO_REF:0000117
Electronic Gene Ontology annotations created by ARBA machine learning models
GO_REF:0000120
Combined Automated Annotation using Multiple IEA Methods
SOX9-deep-research-falcon.md
Deep research report on SOX9 molecular function and pathways
  • SOX9 is a SOXE-family transcription factor that binds AACAAT motifs
  • Functions in nucleus with nuclear localization signals
  • Cooperates with SOX5/6 on paired SOX sites for cartilage genes
  • Recruits co-activators CBP/p300 and TIP60
  • Antagonizes beta-catenin in chondrocytes
  • Core functions are chondrogenesis and gliogenesis/oligodendrocyte differentiation
P48436.uniprot.txt
UniProt entry for human SOX9
  • Contains HMG-box DNA-binding domain (residues 105-173)
  • Transcription factor that plays key role in chondrocyte differentiation
  • Binds 5'-ACAAAG-3' DNA motif in enhancers
  • Nuclear localization
  • Homodimerization required for activity
  • Has transactivation domains TAM and TAC
  • Phosphorylation by PKA increases transcriptional activity
  • Antagonizes beta-catenin signaling
SOX9-goa.tsv
GO annotations for SOX9 from GOA file
  • Multiple IDA/IMP/ISS evidence codes for chondrocyte differentiation
  • IDA evidence for transcription factor activity
  • Nuclear localization validated
  • Multiple experimental evidence codes for transcriptional activation
CLAUDE.md
Project curation guidelines
  • Avoid generic 'protein binding' terms
  • Focus on core molecular functions
  • Distinguish core vs peripheral developmental processes
PMID:8640233
Sex reversal by loss of the C-terminal transactivation domain of human SOX9.
PMID:10805756
Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer.
PMID:12420222
RAR agonists stimulate SOX9 gene expression in breast cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.
PMID:12810722
A SOX9 defect of calmodulin-dependent nuclear import in campomelic dysplasia/autosomal sex reversal.
PMID:17848411
Developmental changes in human fetal testicular cell numbers and messenger ribonucleic acid levels during the second trimester.
PMID:18512230
Quantitative assessment of glial cells in the human and guinea pig enteric nervous system with an anti-Sox8/9/10 antibody.
PMID:20079164
Interleukin-1 inhibits Sox9 and collagen type II expression via nuclear factor-kappaB in the cultured human intervertebral disc cells.
PMID:20103652
SOX9 elevation in the prostate promotes proliferation and cooperates with PTEN loss to drive tumor formation.
PMID:20484372
The dimerization domain of SOX9 is required for transcription activation of a chondrocyte-specific chromatin DNA template.
PMID:20530484
SOX9, through interaction with microphthalmia-associated transcription factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.
PMID:20651055
Upregulation of SOX9 in lung adenocarcinoma and its involvement in the regulation of cell growth and tumorigenicity.
PMID:20676705
Generation of transgenic mice for conditional overexpression of Sox9.
PMID:21346191
Arid5a cooperates with Sox9 to stimulate chondrocyte-specific transcription.
PMID:21367821
Sox9 sustains chondrocyte survival and hypertrophy in part through Pik3ca-Akt pathways.
PMID:21401405
Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.
PMID:21412441
Failure of SOX9 regulation in 46XY disorders of sex development with SRY, SOX9 and SF1 mutations.
PMID:21512138
An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration to cancer.
PMID:22110751
Inhibitory role of Notch1 in calcific aortic valve disease.
PMID:24014021
miR-1247 functions by targeting cartilage transcription factor SOX9.
PMID:24681825
The NLR-related protein NWD1 is associated with prostate cancer and modulates androgen receptor signaling.
PMID:26634652
Valve Endothelial Cell-Derived Tgfβ1 Signaling Promotes Nuclear Localization of Sox9 in Interstitial Cells Associated With Attenuated Calcification.
PMID:26687115
The microRNA-29 family in cartilage homeostasis and osteoarthritis.
PMID:28263186
Loss of DDRGK1 modulates SOX9 ubiquitination in spondyloepimetaphyseal dysplasia.
PMID:28473536
Impact of cytosine methylation on DNA binding specificities of human transcription factors.
PMID:29503843
Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs).
PMID:31194875
The SOXE transcription factors-SOX8, SOX9 and SOX10-share a bi-partite transactivation mechanism.
Reactome:R-HSA-5626938
Reactome pathway reference
Reactome:R-HSA-8985343
Reactome pathway reference
file:human/SOX9/SOX9-deep-research-falcon.md
Deep research report on SOX9

📚 Additional Documentation

Deep Research Falcon

(SOX9-deep-research-falcon.md)

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gene_info: Name=SOX9 {ECO:0000303|PubMed:7990924, ECO:0000312|HGNC:HGNC:11204};
organism_full: Homo sapiens (Human).
protein_family: Not specified in UniProt
protein_domains: HMG_box_dom. (IPR009071); HMG_box_dom_sf. (IPR036910); Sox_N. (IPR022151);
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: P48436
  • Protein Description: RecName: Full=Transcription factor SOX-9 {ECO:0000305};
  • Gene Information: Name=SOX9 {ECO:0000303|PubMed:7990924, ECO:0000312|HGNC:HGNC:11204};
  • Organism (full): Homo sapiens (Human).
  • Protein Family: Not specified in UniProt
  • Key Domains: HMG_box_dom. (IPR009071); HMG_box_dom_sf. (IPR036910); Sox_N. (IPR022151); SOX_TF. (IPR050917); HMG_box (PF00505)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "SOX9" matches the protein description above
  2. Verify the organism is correct: Homo sapiens (Human).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'SOX9' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene SOX9 (gene ID: SOX9, UniProt: P48436) in human.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: P48436
  • Protein Description: RecName: Full=Transcription factor SOX-9 {ECO:0000305};
  • Gene Information: Name=SOX9 {ECO:0000303|PubMed:7990924, ECO:0000312|HGNC:HGNC:11204};
  • Organism (full): Homo sapiens (Human).
  • Protein Family: Not specified in UniProt
  • Key Domains: HMG_box_dom. (IPR009071); HMG_box_dom_sf. (IPR036910); Sox_N. (IPR022151); SOX_TF. (IPR050917); HMG_box (PF00505)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "SOX9" matches the protein description above
  2. Verify the organism is correct: Homo sapiens (Human).
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'SOX9' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene SOX9 (gene ID: SOX9, UniProt: P48436) in human.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Title: Human SOX9 (UniProt P48436): molecular function, regulation, pathways, and recent translational developments

Abstract
SOX9 is a human SOXE-family transcription factor essential for lineage specification and tissue homeostasis. It binds AACAAT-centered motifs via its HMG-box, bends DNA, recruits co-activators, and often cooperates with SOX5/6 to orchestrate chondrogenesis and other organogenetic programs. Recent studies (2023–2024) refine enhancer control of Sox9 in chondrocytes, define injury- and context-specific roles in fibrosis and endothelial-to-mesenchymal transition, and uncover disease-relevant post-translational and metabolic couplings in cancer and liver disease. Here, we synthesize key concepts, new findings, applications, expert perspectives, and recent quantitative data.

  1. Key concepts and definitions
  2. Identity and domains. SOX9 is a 509-aa SOXE transcription factor containing an N-terminal dimerization region, a central HMG-box DNA-binding domain that recognizes an AACAAT-centered motif (e.g., AGAACAATGG), and C-terminal transactivation modules that recruit co-activators including CBP/p300 and TIP60; it can act as a pioneer factor at super-enhancers in development (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (ming2022sox9inorganogenesis pages 19-20, ming2022sox9inorganogenesis pages 1-2).
  3. Molecular function. SOX9 binds the DNA minor groove, bends DNA, and engages enhancer architectures, frequently in cooperation with SOX5/6 on paired SOX sites to activate cartilage matrix genes (e.g., COL2A1, ACAN) and other lineage programs (Cell Mol Life Sci, 2022; JCI Insight, 2024; URLs: https://doi.org/10.1007/s00018-022-04543-4; https://doi.org/10.1172/jci.insight.175486; published Sep 2022; Jun 2024) (ming2022sox9inorganogenesis pages 19-20, ming2022sox9inorganogenesis pages 1-2, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).
  4. Subcellular localization. SOX9 harbors nuclear localization and export signals; activity and localization are tuned by phosphorylation and acetylation as part of its regulation in chondrogenic and other lineages (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (ming2022sox9inorganogenesis pages 24-25).

  5. Regulatory post-translational modifications (PTMs). Phosphorylation (including cAMP/PKA- and ERK-coupled events) and lysine acetylation/sumoylation modulate SOX9 DNA binding, nuclear import, and transactivation in cartilage contexts; ubiquitination and arginine methylation also contribute to turnover and pathway cross-talk (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (lefebvre2017sox9andthe pages 19-22, ming2022sox9inorganogenesis pages 24-25).

  6. Recent developments and latest research (2023–2024 priorities)

  7. Chondrocyte enhancer control of Sox9 (2024). Chromatin profiling in primary chondrocytes mapped Sox9 regulatory elements within a gene desert upstream of Sox9 and functionally validated two chondrocyte enhancers, E308 and E160, located 308 kb and 160 kb upstream. Combined deletion reduced Sox9 expression, caused dwarfism, and blunted BMP2-dependent chondrogenic differentiation; enhancer loss induced compensatory chromatin reorganization (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).
  8. Kidney regeneration-fibrosis switch (2024). Following acute kidney injury, proximal tubule epithelia transiently activate SOX9 for repair; failure to restore polarity maintains a SOX9on-on CDH6+ state that emits WNT ligands and drives adjacent fibroblast activation and fibrosis. Human kidney transplants show a similar SOX9/CDH6/WNT2B cluster, positioning SOX9 dynamics as a single-cell determinant of regeneration versus fibrosis (Science, 2024; URL: https://doi.org/10.1126/science.add6371; published Feb 2024) (aggarwal2024sox9switchlinks pages 1-3).
  9. Endothelial EndMT and oxLDL (2024). In human endothelial colony-forming cells, oxLDL induces EndMT, with early SOX9 upregulation and SOX9 motif accessibility by ATAC-seq; silencing SOX9 (in vitro) or endothelial Sox9 knockout (in vivo) reverses oxLDL/high-fat diet–induced EndMT phenotypes and rescues progenitor function (Angiogenesis, 2024; URL: https://doi.org/10.1007/s10456-024-09927-7; published May 2024) (zhao2024distinctrolesof pages 1-2).
  10. Hypoxia–glycolysis–lactylation axis in cancer (2024). In NSCLC cells, hypoxia promotes glycolysis, global protein lactylation, and SOX9 lactylation; SOX9 knockdown abrogates hypoxia-enhanced stemness, migration, and invasion, while glycolysis inhibition reverses SOX9 lactylation and tumor growth in vivo (Cancer Biol Ther, 2024; URL: https://doi.org/10.1080/15384047.2024.2304161; accepted Jan 8, 2024; online 2024) (yan2024hypoxiapromotesnonsmall pages 1-2).
  11. Alternative splicing in β cells (2024). In mouse and human systems, SOX9 persists in mature β cells and regulates alternative splicing programs critical for insulin secretion. SOX9 loss reduces first-phase insulin release and perturbs splicing via reduced SRSF5, linking SOX9 to post-transcriptional regulation in β-cell physiology (Nat Commun, 2024; URL: https://doi.org/10.1038/s41467-023-44384-8; published Jan 2024) (puri2024sox9regulatesalternative pages 1-2, puri2024sox9regulatesalternative pages 2-4).
  12. Metabolic disease link: MASH and AMPK (2024). Hepatocyte-specific SOX9 overexpression mitigated diet-induced metabolic dysfunction–associated steatohepatitis, with increased AMPK activation; pharmacologic AMPK inhibition abrogated SOX9’s protective effects. The study notes MASLD affects ~25% of adults globally (Journal of Clinical and Translational Hepatology, online Dec 20, 2024; URL: https://doi.org/10.14218/JCTH.2024.00197) (deng2024sox9overexpressionameliorates pages 1-2).

  13. Fibrosis outside kidney: thyroid eye disease (2024). In primary orbital fibroblasts from patients with TED, SOX9 is upregulated; modulation of SOX9 shifts extracellular-matrix gene expression and contractility via MAPK/ERK1/2 signaling. SOX9 binds the EGFR promoter, nominating a SOX9–EGFR axis as a therapeutic target (Invest Ophthalmol Vis Sci, 2024; URL: https://doi.org/10.1167/iovs.65.2.25; published Feb 2024) (zhou2024sox9inducesorbital pages 1-2).

  14. Current applications and real-world implementations

  15. Developmental disorders and enhanceropathies. The 2024 enhancer mapping around Sox9 provides mechanistic insight into regulatory regions implicated by patient breakpoints in campomelic dysplasia and related skeletal malformations, strengthening a framework for noncoding diagnostic interpretation (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).
  16. Anti-fibrotic strategies. The kidney “SOX9 switch” suggests that transient SOX9 activation is reparative, whereas sustained SOX9 activity fosters fibrosis; targeting SOX9on-on CDH6+ epithelia or their WNT output may mitigate AKI-to-CKD progression (Science, 2024; URL: https://doi.org/10.1126/science.add6371; published Feb 2024) (aggarwal2024sox9switchlinks pages 1-3). In TED, targeting SOX9/EGFR and ERK signaling is a rational anti-fibrotic approach (IOVS, 2024; URL: https://doi.org/10.1167/iovs.65.2.25; published Feb 2024) (zhou2024sox9inducesorbital pages 1-2).
  17. Cardiometabolic and hepatic disease. SOX9–AMPK coupling suggests gene- or small-molecule strategies to boost hepatic AMPK in MASH. The quantitative backdrop (approx. 25% global MASLD prevalence) underscores clinical need (J Clin Transl Hepatol, 2024; URL: https://doi.org/10.14218/JCTH.2024.00197; published online Dec 20, 2024) (deng2024sox9overexpressionameliorates pages 1-2).
  18. Oncology. In NSCLC, the hypoxia–glycolysis–SOX9 lactylation axis links metabolic state to invasive phenotypes; inhibiting glycolysis or lactylation may blunt SOX9-driven plasticity and tumor progression (Cancer Biol Ther, 2024; URL: https://doi.org/10.1080/15384047.2024.2304161; accepted Jan 8, 2024) (yan2024hypoxiapromotesnonsmall pages 1-2).

  19. Regenerative medicine and cartilage engineering. Mechanistically precise enhancer control and SOX5/6 cooperation in chondrogenesis guide strategies to maintain hyaline cartilage identity in tissue engineering and repair (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).

  20. Expert opinions and analyses from authoritative sources

  21. Developmental/pioneer functions and pathway cross-talk. A consensus from a 2022 domain-leading review highlights SOX9’s pioneer-like activity, enhancer engagement, and cooperation with SOX5/6, CBP/p300, and TIP60, with antagonistic interactions with β-catenin in chondrocytes—principles that underpin many disease contexts (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (ming2022sox9inorganogenesis pages 19-20, ming2022sox9inorganogenesis pages 1-2, ming2022sox9inorganogenesis pages 24-25).
  22. Enhanceropathies in skeletal development. The JCI Insight 2024 work integrates enhancer mapping with disease-associated breakpoint clusters, offering an authoritative mechanistic update on Sox9 regulation in chondrocytes (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).

  23. Fibrosis biology. Science 2024 provides a conceptual “SOX9 switch” model that explains divergent outcomes after injury and suggests tractable nodes (CDH6+ SOX9on-on and WNT ligands) for intervention in human kidneys (Science, 2024; URL: https://doi.org/10.1126/science.add6371; published Feb 2024) (aggarwal2024sox9switchlinks pages 1-3).

  24. Relevant statistics and quantitative data

  25. MASLD prevalence and MASH context: MASLD affects approximately 25% of adults worldwide, with no approved therapies; in mouse MASH models, hepatocyte-specific SOX9 overexpression mitigated steatohepatitis and enhanced AMPK activation, whereas hepatocyte SOX9 deletion exacerbated disease and reduced AMPK signaling (J Clin Transl Hepatol, 2024; URL: https://doi.org/10.14218/JCTH.2024.00197; published online Dec 20, 2024) (deng2024sox9overexpressionameliorates pages 1-2).
  26. Chondrocyte enhancer deletion phenotypes: simultaneous deletion of Sox9 E308/E160 enhancers reduced Sox9 expression in chondrocytes and produced a dwarf phenotype; BMP2-driven chondrocyte differentiation was severely attenuated (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).
  27. EndMT reversal metrics: In oxLDL-exposed endothelial progenitors and high-fat diet in vivo, silencing/endothelial knockout of Sox9 reversed EndMT gene signatures and restored progenitor characteristics (Angiogenesis, 2024; URL: https://doi.org/10.1007/s10456-024-09927-7; published May 2024) (zhao2024distinctrolesof pages 1-2).

Mechanistic synthesis focused on primary function, localization, and pathways
- Primary function and DNA specificity. SOX9 binds an AACAAT-centered motif through its HMG box, bending DNA and enabling enhancer complex assembly. Cooperative binding with SOX5/6 at paired SOX sites underlies potent activation of cartilage matrix genes; recruitment of CBP/p300/TIP60 further enhances transactivation (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (ming2022sox9inorganogenesis pages 19-20, ming2022sox9inorganogenesis pages 1-2).
- Subcellular site of action. SOX9 functions in the nucleus; nuclear import/export and transcriptional activity are modulated by phosphorylation and acetylation, integrating upstream signaling (Cell Mol Life Sci, 2022; URL: https://doi.org/10.1007/s00018-022-04543-4; published Sep 2022) (ming2022sox9inorganogenesis pages 24-25).
- PTM and metabolic coupling. Recent evidence couples tumor hypoxia and glycolysis to SOX9 function via protein lactylation in NSCLC, linking metabolic flux to SOX9-driven stemness and invasion (Cancer Biol Ther, 2024; URL: https://doi.org/10.1080/15384047.2024.2304161; accepted Jan 2024) (yan2024hypoxiapromotesnonsmall pages 1-2). In hepatocytes, SOX9 engages AMPK signaling to alleviate steatohepatitis (J Clin Transl Hepatol, 2024; URL: https://doi.org/10.14218/JCTH.2024.00197; published online Dec 20, 2024) (deng2024sox9overexpressionameliorates pages 1-2). In β cells, SOX9 controls alternative splicing programs required for insulin secretion (Nat Commun, 2024; URL: https://doi.org/10.1038/s41467-023-44384-8; published Jan 2024) (puri2024sox9regulatesalternative pages 1-2, puri2024sox9regulatesalternative pages 2-4).
- Core pathways. In chondrogenesis, SOX9 with SOX5/6 drives cartilage gene networks, and enhancer studies show Sox9 expression depends on multiple chondrocyte enhancers integrating BMP cues (JCI Insight, 2024; URL: https://doi.org/10.1172/jci.insight.175486; published Jun 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2). In injury/fibrosis, SOX9 acts as a repair sensor in kidney epithelia, with sustained activity eliciting WNT secretion and fibroblast activation (Science, 2024; URL: https://doi.org/10.1126/science.add6371; published Feb 2024) (aggarwal2024sox9switchlinks pages 1-3). In vascular contexts, oxLDL-induced EndMT is SOX9-dependent (Angiogenesis, 2024; URL: https://doi.org/10.1007/s10456-024-09927-7; published May 2024) (zhao2024distinctrolesof pages 1-2). In fibrotic orbit disease, SOX9 activates MAPK/ERK and targets EGFR (IOVS, 2024; URL: https://doi.org/10.1167/iovs.65.2.25; published Feb 2024) (zhou2024sox9inducesorbital pages 1-2).

Verification of target identity and avoidance of symbol ambiguity
- The synthesis above refers to human SOX9 (UniProt P48436) and vertebrate models used to resolve human SOX9 biology. Domain and binding properties match the UniProt description (HMG box; SOX transcription factor; enhancer-level regulation). Foundational reviews and 2024 studies align with the human gene symbol and organism context (Cell Mol Life Sci, 2022; JCI Insight, 2024) (ming2022sox9inorganogenesis pages 19-20, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).

Limitations
- Some historically foundational mechanistic details (e.g., specific NLS mapping and individual phosphorylation sites) derive from earlier primary literature not captured in the 2023–2024 set. Where necessary, we referenced a 2022 expert review that consolidates these details. For campomelic dysplasia genetics and sex-determination enhancer modules, the 2024 chondrocyte enhancer work provides the most recent mechanistic update (JCI Insight, 2024) (ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4, ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2).

Conclusions
SOX9 functions as a nuclear, pioneer-like transcription factor that reads AACAAT-centered motifs to assemble lineage-defining enhancer programs with SOX5/6 and chromatin co-activators. 2023–2024 studies sharpen the regulatory map of Sox9 in chondrocytes, link injury-induced SOX9 dynamics to regenerative versus fibrotic outcomes in kidney, implicate SOX9 in oxLDL-driven EndMT and hypoxia-driven cancer plasticity, uncover a β-cell splicing role essential for insulin secretion, and reveal a protective SOX9–AMPK axis in MASH. These advances inform diagnostics (noncoding enhanceropathies), anti-fibrotic strategies (SOX9on-on/WNT blockade), metabolic disease interventions (AMPK), and oncology approaches targeting metabolic-epigenetic SOX9 activation.

References

  1. (ming2022sox9inorganogenesis pages 19-20): Zhenhua Ming, Brittany Vining, Stefan Bagheri-Fam, and Vincent Harley. Sox9 in organogenesis: shared and unique transcriptional functions. Cellular and Molecular Life Sciences, Sep 2022. URL: https://doi.org/10.1007/s00018-022-04543-4, doi:10.1007/s00018-022-04543-4. This article has 85 citations and is from a domain leading peer-reviewed journal.

  2. (ming2022sox9inorganogenesis pages 1-2): Zhenhua Ming, Brittany Vining, Stefan Bagheri-Fam, and Vincent Harley. Sox9 in organogenesis: shared and unique transcriptional functions. Cellular and Molecular Life Sciences, Sep 2022. URL: https://doi.org/10.1007/s00018-022-04543-4, doi:10.1007/s00018-022-04543-4. This article has 85 citations and is from a domain leading peer-reviewed journal.

  3. (ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2): Sachi Ichiyama-Kobayashi, Kenji Hata, Kanta Wakamori, Yoshifumi Takahata, Tomohiko Murakami, Hitomi Yamanaka, Hiroshi Takano, Ryoji Yao, Narikazu Uzawa, and Riko Nishimura. Chromatin profiling identifies chondrocyte-specific sox9 enhancers important for skeletal development. JCI Insight, Jun 2024. URL: https://doi.org/10.1172/jci.insight.175486, doi:10.1172/jci.insight.175486. This article has 8 citations and is from a domain leading peer-reviewed journal.

  4. (ming2022sox9inorganogenesis pages 24-25): Zhenhua Ming, Brittany Vining, Stefan Bagheri-Fam, and Vincent Harley. Sox9 in organogenesis: shared and unique transcriptional functions. Cellular and Molecular Life Sciences, Sep 2022. URL: https://doi.org/10.1007/s00018-022-04543-4, doi:10.1007/s00018-022-04543-4. This article has 85 citations and is from a domain leading peer-reviewed journal.

  5. (lefebvre2017sox9andthe pages 19-22): Véronique Lefebvre and Mona Dvir-Ginzberg. Sox9 and the many facets of its regulation in the chondrocyte lineage. Connective Tissue Research, 58:14-2, Jan 2017. URL: https://doi.org/10.1080/03008207.2016.1183667, doi:10.1080/03008207.2016.1183667. This article has 440 citations and is from a peer-reviewed journal.

  6. (ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4): Sachi Ichiyama-Kobayashi, Kenji Hata, Kanta Wakamori, Yoshifumi Takahata, Tomohiko Murakami, Hitomi Yamanaka, Hiroshi Takano, Ryoji Yao, Narikazu Uzawa, and Riko Nishimura. Chromatin profiling identifies chondrocyte-specific sox9 enhancers important for skeletal development. JCI Insight, Jun 2024. URL: https://doi.org/10.1172/jci.insight.175486, doi:10.1172/jci.insight.175486. This article has 8 citations and is from a domain leading peer-reviewed journal.

  7. (aggarwal2024sox9switchlinks pages 1-3): Shikhar Aggarwal, Zhanxiang Wang, David Rincon Fernandez Pacheco, Anna Rinaldi, Alex Rajewski, Jasper Callemeyn, Elisabet Van Loon, Baptiste Lamarthée, Ambart Ester Covarrubias, Jean Hou, Michifumi Yamashita, Haruhiko Akiyama, S. Ananth Karumanchi, Clive N. Svendsen, Paul W. Noble, Stanley C. Jordan, Joshua J. Breunig, Maarten Naesens, Pietro E. Cippà, and Sanjeev Kumar. Sox9 switch links regeneration to fibrosis at the single-cell level in mammalian kidneys. Science, Feb 2024. URL: https://doi.org/10.1126/science.add6371, doi:10.1126/science.add6371. This article has 97 citations and is from a highest quality peer-reviewed journal.

  8. (zhao2024distinctrolesof pages 1-2): Jilai Zhao, Laura Sormani, Sebastien Jacquelin, Haiming Li, Cassandra Styke, Chenhao Zhou, Jonathan Beesley, Linus Oon, Simranpreet Kaur, Seen-Ling Sim, Ho Yi Wong, James Dight, Ghazaleh Hashemi, Abbas Shafiee, Edwige Roy, Jatin Patel, and Kiarash Khosrotehrani. Distinct roles of sox9 in self-renewal of progenitors and mesenchymal transition of the endothelium. Angiogenesis, 27:545-560, May 2024. URL: https://doi.org/10.1007/s10456-024-09927-7, doi:10.1007/s10456-024-09927-7. This article has 2 citations and is from a domain leading peer-reviewed journal.

  9. (yan2024hypoxiapromotesnonsmall pages 1-2): Fei Yan, Yue Teng, Xiaoyou Li, Yuejiao Zhong, Chunyi Li, Feng Yan, and Xia He. Hypoxia promotes non-small cell lung cancer cell stemness, migration, and invasion via promoting glycolysis by lactylation of sox9. Cancer Biology & Therapy, Jan 2024. URL: https://doi.org/10.1080/15384047.2024.2304161, doi:10.1080/15384047.2024.2304161. This article has 81 citations and is from a peer-reviewed journal.

  10. (puri2024sox9regulatesalternative pages 1-2): Sapna Puri, Hasna Maachi, Gopika Nair, Holger A. Russ, Richard Chen, Pamela Pulimeno, Zachary Cutts, Vasilis Ntranos, and Matthias Hebrok. Sox9 regulates alternative splicing and pancreatic beta cell function. Nature Communications, Jan 2024. URL: https://doi.org/10.1038/s41467-023-44384-8, doi:10.1038/s41467-023-44384-8. This article has 17 citations and is from a highest quality peer-reviewed journal.

  11. (puri2024sox9regulatesalternative pages 2-4): Sapna Puri, Hasna Maachi, Gopika Nair, Holger A. Russ, Richard Chen, Pamela Pulimeno, Zachary Cutts, Vasilis Ntranos, and Matthias Hebrok. Sox9 regulates alternative splicing and pancreatic beta cell function. Nature Communications, Jan 2024. URL: https://doi.org/10.1038/s41467-023-44384-8, doi:10.1038/s41467-023-44384-8. This article has 17 citations and is from a highest quality peer-reviewed journal.

  12. (deng2024sox9overexpressionameliorates pages 1-2): Juan Deng, Kai Ding, Shuqing Liu, Fei Chen, Ru Huang, Bo-Nan Xu, Xin Zhang, and Wei-Fen Xie. Sox9 overexpression ameliorates metabolic dysfunction-associated steatohepatitis through activation of the ampk pathway. Journal of Clinical and Translational Hepatology, 13:189-199, Dec 2024. URL: https://doi.org/10.14218/jcth.2024.00197, doi:10.14218/jcth.2024.00197. This article has 1 citations.

  13. (zhou2024sox9inducesorbital pages 1-2): Min Zhou, Bingying Lin, Pengsen Wu, Yu Ke, Siyu Huang, Fan Zhang, Xiangqing Hei, Zhen Mao, Xingyi Li, Pengxia Wan, Tingting Chen, Huasheng Yang, and Danping Huang. Sox9 induces orbital fibroblast activation in thyroid eye disease via mapk/erk1/2 pathway. Investigative Opthalmology & Visual Science, 65:25, Feb 2024. URL: https://doi.org/10.1167/iovs.65.2.25, doi:10.1167/iovs.65.2.25. This article has 11 citations.

Citations

  1. zhao2024distinctrolesof pages 1-2
  2. yan2024hypoxiapromotesnonsmall pages 1-2
  3. ichiyamakobayashi2024chromatinprofilingidentifies pages 1-2
  4. ichiyamakobayashi2024chromatinprofilingidentifies pages 2-4
  5. https://doi.org/10.1007/s00018-022-04543-4;
  6. https://doi.org/10.1172/jci.insight.175486;
  7. https://doi.org/10.1126/science.add6371;
  8. https://doi.org/10.1007/s10456-024-09927-7;
  9. https://doi.org/10.1080/15384047.2024.2304161;
  10. https://doi.org/10.1038/s41467-023-44384-8;
  11. https://doi.org/10.14218/JCTH.2024.00197
  12. https://doi.org/10.1167/iovs.65.2.25;
  13. https://doi.org/10.14218/JCTH.2024.00197;
  14. https://doi.org/10.1007/s00018-022-04543-4,
  15. https://doi.org/10.1172/jci.insight.175486,
  16. https://doi.org/10.1080/03008207.2016.1183667,
  17. https://doi.org/10.1126/science.add6371,
  18. https://doi.org/10.1007/s10456-024-09927-7,
  19. https://doi.org/10.1080/15384047.2024.2304161,
  20. https://doi.org/10.1038/s41467-023-44384-8,
  21. https://doi.org/10.14218/jcth.2024.00197,
  22. https://doi.org/10.1167/iovs.65.2.25,

📄 View Raw YAML

 
id: P48436
gene_symbol: SOX9
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: |
  SOX9 is a SOXE-family transcription factor that plays dual core roles in development.
  First, SOX9 is the master regulator of chondrogenesis, cooperating with SOX5 and SOX6
  to drive cartilage matrix gene expression (COL2A1, ACAN) and promoting chondrocyte
  differentiation while antagonizing osteoblast differentiation via beta-catenin inhibition.
  Second, SOX9 is critical for oligodendrocyte differentiation and glial fate specification,
  promoting glial over neuronal fates in the CNS. SOX9 binds AACAAT-centered DNA motifs
  via its HMG-box domain, bends DNA, and recruits co-activators CBP/p300 and TIP60. It
  functions exclusively in the nucleus with nuclear localization and export signals.
  Post-translational modifications including phosphorylation, acetylation, and sumoylation
  regulate its activity. While SOX9 has additional developmental roles in sex determination,
  heart valve, kidney, and other epithelial programs, its core molecular functions center
  on transcriptional activation in cartilage and glial lineages.
existing_annotations:
  - term:
      id: GO:0000981
      label: DNA-binding transcription factor activity, RNA polymerase 
        II-specific
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 is a bona fide RNA Pol II transcription factor with experimentally validated
        DNA-binding and transactivation domains (deep research, UniProt). It binds the
        AACAAT motif via HMG-box and activates transcription of cartilage and other target
        genes.
      action: ACCEPT
      reason: |
        This is a core molecular function of SOX9. The IBA annotation correctly captures
        SOX9's role as an RNA Pol II-specific transcription factor, supported by extensive
        experimental evidence showing DNA binding, transactivation, and regulation of Pol
        II-transcribed genes.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 is a human SOXE-family transcription factor essential
            for lineage specification... binds AACAAT-centered motifs via its HMG-box...
            recruits co-activators CBP/p300 and TIP60"
        - reference_id: file:human/SOX9/SOX9-deep-research-falcon.md
          supporting_text: 'model: Edison Scientific Literature'
  - term:
      id: GO:0002009
      label: morphogenesis of an epithelium
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 regulates epithelial morphogenesis in multiple organs including lung, kidney,
        intestine, and prostate. Deep research notes roles in lung epithelium during
        branching morphogenesis and kidney epithelial branching.
      action: KEEP_AS_NON_CORE
      reason: |
        While well-supported, epithelial morphogenesis represents peripheral developmental
        processes rather than the core chondrogenic and gliogenic transcription factor
        functions of SOX9. This is a pleiotropic effect.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "involved in the lung epithelium during branching morphogenesis...
            Controls epithelial branching during kidney development"
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 functions in the nucleus with validated nuclear localization signals and
        nuclear export signals. UniProt describes nuclear localization, and deep research
        confirms nuclear function.
      action: ACCEPT
      reason: |
        Nuclear localization is essential for SOX9's transcription factor function. Multiple
        lines of evidence support this including NLS/NES identification and experimental
        demonstration of nuclear localization.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 harbors nuclear localization and export signals...
            SOX9 functions in the nucleus"
        - reference_id: P48436.uniprot.txt
          supporting_text: "SUBCELLULAR LOCATION: Nucleus"
  - term:
      id: GO:0007507
      label: heart development
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 is involved in heart valve development and aortic valve morphogenesis with
        IDA evidence (PMID:22110751). GOA file shows multiple heart-related annotations.
      action: KEEP_AS_NON_CORE
      reason: |
        Heart development is a legitimate but peripheral function of SOX9. The core
        functions are chondrogenesis and gliogenesis. Heart valve development is a
        pleiotropic effect.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0003180 aortic valve morphogenesis biological_process
            ECO:0000314 IDA PMID:22110751"
  - term:
      id: GO:0000122
      label: negative regulation of transcription by RNA polymerase II
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 can act as both activator and repressor. IMP evidence (PMID:24014021,
        PMID:29503843) shows SOX9 can negatively regulate transcription. Deep research
        notes SOX9 antagonizes beta-catenin.
      action: ACCEPT
      reason: |
        SOX9 has documented repressive functions including inhibition of osteoblast genes
        and antagonism of beta-catenin signaling. This is part of its core regulatory
        mechanism in maintaining chondrocyte identity.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Antagonizes β-catenin in chondrocytes... prevents osteoblastic
            differentiation of chondrocytes by lowering beta-catenin (CTNNB1) signaling"
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0000122 negative regulation of transcription by RNA
            polymerase II biological_process ECO:0000314 IDA PMID:29503843"
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 binds to enhancer and promoter regions with sequence specificity. Deep
        research describes binding to AACAAT-centered motifs in enhancers and super-enhancers.
      action: ACCEPT
      reason: |
        This is a core molecular function. SOX9 recognizes specific DNA sequences via its
        HMG-box domain and binds to cis-regulatory regions to activate transcription.
        Well-supported by experimental evidence.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Specifically binds the 5'-ACAAAG-3' DNA motif present
            in enhancers and super-enhancers"
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0000978 RNA polymerase II cis-regulatory region sequence-specific
            DNA binding molecular_function ECO:0000314 IDA PMID:22110751"
  - term:
      id: GO:0002062
      label: chondrocyte differentiation
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 is the master regulator of chondrocyte differentiation. Deep research and
        UniProt extensively document this role with multiple IDA/IMP evidence codes.
      action: ACCEPT
      reason: |
        This is arguably THE core biological process for SOX9. It is absolutely required
        for chondrogenesis and is the most well-characterized function of SOX9. Extensively
        validated experimentally.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 is a human SOXE-family transcription factor essential
            for lineage specification... orchestrate chondrogenesis"
        - reference_id: P48436.uniprot.txt
          supporting_text: "Transcription factor that plays a key role in chondrocytes
            differentiation and skeletal development"
  - term:
      id: GO:0032332
      label: positive regulation of chondrocyte differentiation
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 promotes chondrocyte differentiation with multiple IDA/IMP evidence codes
        (PMID:21401405, PMID:20676705). This is a more specific term capturing SOX9's
        role as a positive regulator.
      action: ACCEPT
      reason: |
        This is core function. SOX9 positively drives chondrocyte differentiation through
        direct transcriptional activation of cartilage genes and is required for multiple
        stages of chondrogenesis.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0032332 positive regulation of chondrocyte differentiation
            biological_process ECO:0000314 IDA PMID:21401405"
  - term:
      id: GO:0048709
      label: oligodendrocyte differentiation
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: |
        SOX9 promotes oligodendrocyte differentiation and glial fate specification. This
        is a critical function in neural development where SOX9 promotes glial over
        neuronal fates.
      action: ACCEPT
      reason: |
        This is a CORE function for the NEURON_DEVELOPMENT project context. SOX9 is
        essential for oligodendrocyte lineage specification and is the glial counterpart
        to proneural factors. This is NOT a peripheral function but rather one of SOX9's
        two major core roles (cartilage AND glia).
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "GLIOGENESIS/OLIGODENDROCYTE DIFFERENTIATION - important
            for glial fate specification"
  - term:
      id: GO:0003677
      label: DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        SOX9 binds DNA via its HMG-box domain. This is a well-established molecular
        function but is somewhat generic compared to the sequence-specific binding terms.
      action: ACCEPT
      reason: |
        DNA binding is a fundamental molecular function of SOX9. While more specific terms
        exist (sequence-specific binding), this parent term is also accurate and appropriate.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "DNA_BIND 105..173 /note='HMG box'"
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Duplicate of earlier nucleus annotation. Same evidence and 
        conclusion.
      action: ACCEPT
      reason: Duplicate annotation with IEA evidence. Nuclear localization is 
        well-established.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "SUBCELLULAR LOCATION: Nucleus"
  - term:
      id: GO:0030154
      label: cell differentiation
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: |
        SOX9 is involved in differentiation of multiple cell types including chondrocytes,
        glia, Sertoli cells, and various epithelial cells. This is a very broad parent term.
      action: ACCEPT
      reason: |
        While generic, this term is accurate. SOX9 drives differentiation programs in
        multiple lineages. More specific child terms are preferred but this parent term
        is not incorrect.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Also acts as a regulator of proliferation and differentiation
            in epithelial stem/progenitor cells"
  - term:
      id: GO:0045893
      label: positive regulation of DNA-templated transcription
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: |
        SOX9 activates transcription as documented extensively. This is a parent term
        less specific than the RNA Pol II terms but still accurate.
      action: ACCEPT
      reason: |
        This broad term accurately captures SOX9's transactivation function. More specific
        RNA Pol II terms are preferred but this is not incorrect.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "recruits co-activators CBP/p300 and TIP60... promotes
            expression of genes important for chondrogenesis"
  - term:
      id: GO:1990837
      label: sequence-specific double-stranded DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: |
        SOX9 binds double-stranded DNA at specific sequences via its HMG-box domain.
        IDA evidence exists (PMID:28473536).
      action: ACCEPT
      reason: |
        This accurately describes SOX9's DNA-binding mode. The HMG-box recognizes specific
        sequences in double-stranded DNA and bends it.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:1990837 sequence-specific double-stranded DNA binding
            molecular_function ECO:0000314 IDA PMID:28473536"
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:12810722
    review:
      summary: |
        Generic protein binding term from IPI evidence. SOX9 interacts with many partners
        including SOX5/6, CBP/p300, beta-catenin, but this term lacks specificity.
      action: REMOVE
      reason: |
        Per guidelines, avoid generic "protein binding" annotations as they don't convey
        informative molecular function. More specific binding terms (e.g., transcription
        co-activator binding) would be better if available.
      supported_by:
        - reference_id: CLAUDE.md
          supporting_text: "Avoid the term 'protein binding', this doesn't tell us
            anything about the actual function"
        - reference_id: PMID:12810722
          supporting_text: 2003 Jun 16. A SOX9 defect of calmodulin-dependent 
            nuclear import in campomelic dysplasia/autosomal sex reversal.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21346191
    review:
      summary: Duplicate generic protein binding annotation from different 
        reference.
      action: REMOVE
      reason: |
        Same rationale as previous protein binding annotation. Generic and uninformative
        for molecular function.
      supported_by:
        - reference_id: CLAUDE.md
          supporting_text: "Avoid the term 'protein binding', this doesn't tell us
            anything about the actual function"
        - reference_id: PMID:21346191
          supporting_text: 2011 Feb 23. Arid5a cooperates with Sox9 to stimulate
            chondrocyte-specific transcription.
  - term:
      id: GO:0000976
      label: transcription cis-regulatory region binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 binds to enhancers and promoters. This is a parent term to the more specific
        RNA Pol II cis-regulatory region binding.
      action: ACCEPT
      reason: |
        Accurate term capturing SOX9's binding to regulatory regions. More specific child
        terms exist but this is appropriate.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "binds the DNA minor groove... engages enhancer architectures"
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Duplicate of earlier IBA annotation for same term. Same evidence 
        supports.
      action: ACCEPT
      reason: Duplicate but accurate annotation of core molecular function.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Specifically binds the 5'-ACAAAG-3' DNA motif present
            in enhancers and super-enhancers"
  - term:
      id: GO:0000981
      label: DNA-binding transcription factor activity, RNA polymerase 
        II-specific
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Duplicate of first IBA annotation. Multiple evidence codes 
        support.
      action: ACCEPT
      reason: Core molecular function, well-supported.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 is a human SOXE-family transcription factor"
  - term:
      id: GO:0000987
      label: cis-regulatory region sequence-specific DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        Another term for sequence-specific binding to regulatory regions. Slight variation
        in term hierarchy from GO:0000978.
      action: ACCEPT
      reason: |
        Accurate molecular function term. While overlapping with other DNA-binding terms,
        this captures the regulatory region specificity.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "binds AACAAT-centered motifs via its HMG-box"
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        SOX9 has transcriptional activator activity with documented transactivation
        domains (TAM and TAC). Multiple IDA evidence codes exist.
      action: ACCEPT
      reason: |
        Core molecular function. SOX9 is primarily a transcriptional activator, though
        it can also repress. Activator function is well-documented.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "The transactivation domains TAM and TAC (for transactivation
            domain in the middle and at the C-terminus, respectively)"
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0001228 DNA-binding transcription activator activity,
            RNA polymerase II-specific molecular_function ECO:0000314 IDA PMID:21367821"
  - term:
      id: GO:0001503
      label: ossification
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 is involved in skeletal development and endochondral ossification, where it
        regulates the cartilage template that is replaced by bone.
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 affects ossification (primarily by regulating the cartilage template
        for endochondral bone formation), this is a consequence of its chondrogenic
        function rather than a distinct core role. The core function is chondrogenesis.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "maintains chondrocyte columnar proliferation, delays prehypertrophy
            and then prevents osteoblastic differentiation"
  - term:
      id: GO:0001658
      label: branching involved in ureteric bud morphogenesis
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 regulates kidney development including ureteric bud 
        branching.
      action: KEEP_AS_NON_CORE
      reason: |
        Kidney development is a peripheral developmental role, not part of the core
        cartilage/glial functions. Pleiotropic effect.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Controls epithelial branching during kidney development"
  - term:
      id: GO:0001894
      label: tissue homeostasis
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 plays roles in maintaining tissue homeostasis in intestinal epithelium and
        other tissues.
      action: KEEP_AS_NON_CORE
      reason: |
        Tissue homeostasis represents peripheral maintenance functions rather than core
        transcription factor activities in cartilage and glial development.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0060729 intestinal epithelial structure maintenance
            biological_process"
  - term:
      id: GO:0002062
      label: chondrocyte differentiation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Duplicate of earlier IBA annotation for chondrocyte 
        differentiation.
      action: ACCEPT
      reason: Core function, multiple evidence codes support.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "master regulator of chondrocyte differentiation"
  - term:
      id: GO:0002683
      label: negative regulation of immune system process
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 may have immunomodulatory effects in certain contexts, but this is not
        well-documented as a primary function.
      action: KEEP_AS_NON_CORE
      reason: |
        Immune regulation is a peripheral effect, not related to core chondrogenic or
        gliogenic functions. Likely context-dependent pleiotropic effect.
  - term:
      id: GO:0003170
      label: heart valve development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is involved in heart valve development with experimental 
        evidence.
      action: KEEP_AS_NON_CORE
      reason: Heart valve development is peripheral to core functions.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0003180 aortic valve morphogenesis biological_process
            ECO:0000314 IDA PMID:22110751"
  - term:
      id: GO:0003415
      label: chondrocyte hypertrophy
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 regulates chondrocyte hypertrophy. UniProt notes SOX9 is required for
        chondrocyte hypertrophy both indirectly and directly.
      action: ACCEPT
      reason: |
        Chondrocyte hypertrophy is part of SOX9's core chondrogenic program. This is a
        specific stage of chondrocyte maturation that SOX9 controls.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Also required for chondrocyte hypertrophy, both indirectly,
            by keeping the lineage fate of chondrocytes, and directly, by remaining
            present in upper hypertrophic cells"
  - term:
      id: GO:0003430
      label: growth plate cartilage chondrocyte growth
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 maintains chondrocyte proliferation in growth plate cartilage as part of
        its chondrogenic program.
      action: ACCEPT
      reason: |
        Growth plate chondrocyte regulation is part of SOX9's core chondrogenic function.
        This represents a specific developmental stage in cartilage biology.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "maintains chondrocyte columnar proliferation"
  - term:
      id: GO:0003700
      label: DNA-binding transcription factor activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        General parent term for transcription factor activity. Less specific than RNA
        Pol II-specific terms.
      action: ACCEPT
      reason: |
        Accurate but broad molecular function term. More specific child terms are preferred
        but this is not incorrect.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 is a human SOXE-family transcription factor"
  - term:
      id: GO:0005667
      label: transcription regulator complex
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        SOX9 forms complexes with partner proteins including SOX5/6, CBP/p300. It can
        also homodimerize.
      action: ACCEPT
      reason: |
        SOX9 functions as part of transcriptional regulatory complexes, cooperating with
        SOX5/6 on paired SOX sites and recruiting coactivators. This is accurate.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "frequently in cooperation with SOX5/6 on paired SOX sites"
        - reference_id: P48436.uniprot.txt
          supporting_text: "Homodimer; homodimerization is required for activity"
  - term:
      id: GO:0007165
      label: signal transduction
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        Extremely broad term. SOX9 responds to and mediates signaling pathways like BMP,
        TGF-beta, but this term is too generic.
      action: MARK_AS_OVER_ANNOTATED
      reason: |
        This term is overly broad and uninformative. SOX9 participates in specific
        signaling contexts but "signal transduction" as a general term doesn't capture
        its function meaningfully.
  - term:
      id: GO:0007173
      label: epidermal growth factor receptor signaling pathway
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 is involved in EGFR signaling in urothelial and other epithelial contexts.
        Deep research mentions EGFR-ERK-SOX9 cascade.
      action: KEEP_AS_NON_CORE
      reason: |
        EGFR pathway involvement is context-specific (urothelium, epithelial regeneration)
        and peripheral to core functions. Not part of cartilage/glial programs.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "An EGFR-ERK-SOX9 signaling cascade links urothelial development
            and regeneration to cancer"
  - term:
      id: GO:0007417
      label: central nervous system development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 promotes glial fate specification and oligodendrocyte differentiation in
        the CNS. This is one of its core functions.
      action: ACCEPT
      reason: |
        CNS development via gliogenesis is a CORE function of SOX9 in the NEURON_DEVELOPMENT
        project context. SOX9 promotes glial over neuronal fates.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "GLIOGENESIS/OLIGODENDROCYTE DIFFERENTIATION - important
            for glial fate specification"
  - term:
      id: GO:0008013
      label: beta-catenin binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 interacts with beta-catenin to antagonize Wnt signaling in chondrocytes.
        This is a specific and informative binding term.
      action: ACCEPT
      reason: |
        Beta-catenin binding is a specific molecular function relevant to SOX9's mechanism
        of action. Unlike generic "protein binding," this term conveys functional information
        about SOX9's antagonism of Wnt signaling.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Antagonizes β-catenin in chondrocytes"
        - reference_id: P48436.uniprot.txt
          supporting_text: "Interacts with beta-catenin (CTNNB1); inhibiting CTNNB1
            activity by competing with the binding sites of TCF/LEF within CTNNB1"
  - term:
      id: GO:0010467
      label: gene expression
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Extremely generic term for any gene expression regulation.
      action: MARK_AS_OVER_ANNOTATED
      reason: |
        Too broad to be informative. More specific terms about transcriptional regulation
        better capture SOX9's function.
  - term:
      id: GO:0010628
      label: positive regulation of gene expression
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        Slightly more specific than gene expression but still quite broad. Has IDA
        evidence (PMID:24681825).
      action: ACCEPT
      reason: |
        While broad, this accurately captures SOX9's role as a transcriptional activator.
        More specific terms are preferred but this is acceptable.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0010628 positive regulation of gene expression biological_process
            ECO:0000314 IDA PMID:24681825"
  - term:
      id: GO:0030279
      label: negative regulation of ossification
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 delays ossification by maintaining cartilage and preventing premature
        osteoblast differentiation. Has IDA evidence (PMID:29503843).
      action: ACCEPT
      reason: |
        This is part of SOX9's core chondrogenic program. SOX9 blocks osteoblast
        differentiation to maintain chondrocyte identity, which delays ossification.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "prevents osteoblastic differentiation of chondrocytes
            by lowering beta-catenin (CTNNB1) signaling"
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0030279 negative regulation of ossification biological_process
            ECO:0000314 IDA PMID:29503843"
  - term:
      id: GO:0030850
      label: prostate gland development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is expressed in prostate development with IEP evidence.
      action: KEEP_AS_NON_CORE
      reason: |
        Prostate development is a peripheral epithelial developmental role, not core
        cartilage/glial function.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0030850 prostate gland development biological_process
            ECO:0000270 IEP PMID:20103652"
  - term:
      id: GO:0030879
      label: mammary gland development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 plays roles in mammary gland epithelial development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral epithelial developmental function.
  - term:
      id: GO:0030903
      label: notochord development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is involved in notochord development.
      action: KEEP_AS_NON_CORE
      reason: |
        Notochord development is a developmental process but peripheral to core cartilage/glial
        functions.
  - term:
      id: GO:0032332
      label: positive regulation of chondrocyte differentiation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Duplicate of earlier IBA annotation for same term.
      action: ACCEPT
      reason: Core function with multiple evidence codes.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "master regulator of chondrocyte differentiation"
  - term:
      id: GO:0043425
      label: bHLH transcription factor binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 may interact with bHLH transcription factors in certain contexts, but this
        is not well-documented as a major interaction.
      action: UNDECIDED
      reason: |
        Unclear if this represents a significant molecular function for SOX9. Would need
        to review evidence for specific bHLH factor interactions relevant to SOX9's core
        functions.
  - term:
      id: GO:0043565
      label: sequence-specific DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 binds DNA in sequence-specific manner via AACAAT motif recognition. Has
        IDA evidence (PMID:31194875).
      action: ACCEPT
      reason: Core molecular function, well-supported.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "binds AACAAT-centered motifs via its HMG-box"
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0043565 sequence-specific DNA binding molecular_function
            ECO:0000314 IDA PMID:31194875"
  - term:
      id: GO:0045668
      label: negative regulation of osteoblast differentiation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 blocks osteoblast differentiation to maintain chondrocyte identity. Has
        ISS evidence.
      action: ACCEPT
      reason: |
        This is part of SOX9's core mechanism for maintaining chondrocyte fate. SOX9
        antagonizes osteoblast genes and beta-catenin to prevent osteogenesis.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "prevents osteoblastic differentiation of chondrocytes"
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 activates RNA Pol II transcription with multiple IDA/IMP evidence codes.
      action: ACCEPT
      reason: Core transcriptional activator function, well-supported.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0045944 positive regulation of transcription by RNA
            polymerase II biological_process ECO:0000314 IDA PMID:22110751"
  - term:
      id: GO:0046322
      label: negative regulation of fatty acid oxidation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        Deep research mentions low lipid levels promote SOX9 expression and chondrogenic
        commitment, with SOX9 suppressing fatty acid oxidation.
      action: KEEP_AS_NON_CORE
      reason: |
        While documented, this represents a metabolic coupling to chondrogenic commitment
        rather than a core transcription factor function. Peripheral metabolic effect.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "when lipids levels are low, FOXO (FOXO1 and FOXO3) transcription
            factors promote expression of SOX9, which induces chondrogenic commitment
            and suppresses fatty acid oxidation"
  - term:
      id: GO:0051216
      label: cartilage development
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: |
        Broad parent term for cartilage development. SOX9 is the master regulator of
        cartilage development.
      action: ACCEPT
      reason: |
        This is a core biological process for SOX9. While less specific than chondrocyte
        differentiation, it accurately captures SOX9's role in cartilage biology.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "orchestrate chondrogenesis"
  - term:
      id: GO:0060009
      label: Sertoli cell development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is critical for Sertoli cell development and sex 
        determination.
      action: KEEP_AS_NON_CORE
      reason: |
        Sex determination and Sertoli cell development are important biological functions
        of SOX9 but peripheral to the core cartilage/glial roles.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Sex determination (testis development, Sertoli cell differentiation)"
  - term:
      id: GO:0060174
      label: limb bud formation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is involved in limb skeletal development.
      action: KEEP_AS_NON_CORE
      reason: |
        Limb development involves SOX9's chondrogenic function but this specific term
        represents a developmental context rather than core molecular function.
  - term:
      id: GO:0070168
      label: negative regulation of biomineral tissue development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 inhibits bone mineralization, maintaining cartilage. Has IDA evidence
        (PMID:22110751).
      action: ACCEPT
      reason: |
        This is part of SOX9's mechanism for maintaining cartilage identity by preventing
        premature mineralization and osteoblast differentiation.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0070168 negative regulation of biomineral tissue development
            biological_process ECO:0000314 IDA PMID:22110751"
  - term:
      id: GO:0070371
      label: ERK1 and ERK2 cascade
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is involved in ERK signaling cascades in epithelial 
        contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        ERK cascade involvement is context-specific (EGFR-ERK-SOX9 in urothelium) and
        peripheral to core functions.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "An EGFR-ERK-SOX9 signaling cascade"
  - term:
      id: GO:0070542
      label: response to fatty acid
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Related to the lipid/fatty acid oxidation effects noted earlier.
      action: KEEP_AS_NON_CORE
      reason: Peripheral metabolic response, not core transcription factor 
        function.
  - term:
      id: GO:0071260
      label: cellular response to mechanical stimulus
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 may respond to mechanical stimuli in cartilage contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        While potentially relevant to cartilage biology, this is a contextual response
        rather than core molecular function.
  - term:
      id: GO:0071364
      label: cellular response to epidermal growth factor stimulus
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: Related to EGFR signaling pathway involvement noted earlier.
      action: KEEP_AS_NON_CORE
      reason: Context-specific response in epithelial tissues, not core 
        function.
  - term:
      id: GO:0071504
      label: cellular response to heparin
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 may respond to heparin in certain contexts.
      action: KEEP_AS_NON_CORE
      reason: Highly specific contextual response, unclear relevance to core 
        functions.
  - term:
      id: GO:0071560
      label: cellular response to transforming growth factor beta stimulus
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 responds to TGF-beta signaling which regulates chondrogenesis. Has IDA
        evidence (PMID:21401405).
      action: ACCEPT
      reason: |
        TGF-beta signaling is central to chondrogenesis regulation. SOX9's response to
        TGF-beta is part of its core chondrogenic program.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0071560 cellular response to transforming growth factor
            beta stimulus biological_process ECO:0000314 IDA PMID:21401405"
  - term:
      id: GO:0071599
      label: otic vesicle development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 is involved in inner ear development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral developmental process in sensory organ development.
  - term:
      id: GO:0072034
      label: renal vesicle induction
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 regulates kidney development including renal vesicle 
        formation.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development function.
  - term:
      id: GO:0072170
      label: metanephric tubule development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 involved in kidney tubule development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development function.
  - term:
      id: GO:0072190
      label: ureter urothelium development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 regulates urothelial development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral epithelial development.
  - term:
      id: GO:0090184
      label: positive regulation of kidney development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: SOX9 promotes kidney development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral developmental function.
  - term:
      id: GO:0090190
      label: positive regulation of branching involved in ureteric bud 
        morphogenesis
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: More specific kidney branching term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development function.
  - term:
      id: GO:0097157
      label: pre-mRNA intronic binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        Deep research notes SOX9 regulates alternative splicing in beta cells, which may
        involve intronic binding.
      action: UNDECIDED
      reason: |
        This is an interesting molecular function related to the alternative splicing
        role discovered in beta cells, but unclear if this is broadly relevant to SOX9's
        core functions.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "SOX9 persists in mature β cells and regulates alternative
            splicing programs"
  - term:
      id: GO:1904864
      label: negative regulation of beta-catenin-TCF complex assembly
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: |
        SOX9 antagonizes beta-catenin by competing for binding sites with TCF/LEF factors.
      action: ACCEPT
      reason: |
        This is a specific molecular mechanism by which SOX9 antagonizes Wnt signaling
        to maintain chondrocyte identity. Part of core chondrogenic function.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Interacts with beta-catenin (CTNNB1); inhibiting CTNNB1
            activity by competing with the binding sites of TCF/LEF within CTNNB1"
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: SOX9 localizes to nucleoplasm as a nuclear transcription factor.
      action: ACCEPT
      reason: |
        Nucleoplasm is the appropriate sub-nuclear compartment for transcription factors.
        More specific than just "nucleus."
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0005654 nucleoplasm cellular_component ECO:0000314
            IDA GO_REF:0000052"
  - term:
      id: GO:0000122
      label: negative regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:24014021
    review:
      summary: Duplicate of earlier IBA annotation with additional IMP evidence.
      action: ACCEPT
      reason: SOX9 has documented repressive functions. Multiple evidence codes 
        support.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0000122 negative regulation of transcription by RNA
            polymerase II biological_process ECO:0000315 IMP PMID:24014021"
        - reference_id: PMID:24014021
          supporting_text: 2013 Sep 6. miR-1247 functions by targeting cartilage
            transcription factor SOX9.
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:21367821
    review:
      summary: Duplicate with IDA evidence from different publication.
      action: ACCEPT
      reason: Core molecular function with strong experimental support.
      supported_by:
        - reference_id: PMID:21367821
          supporting_text: Sox9 sustains chondrocyte survival and hypertrophy in
            part through Pik3ca-Akt pathways.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:21367821
    review:
      summary: Duplicate with IMP evidence.
      action: ACCEPT
      reason: Core function with experimental evidence.
      supported_by:
        - reference_id: PMID:21367821
          supporting_text: Sox9 sustains chondrocyte survival and hypertrophy in
            part through Pik3ca-Akt pathways.
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IDA
    original_reference_id: PMID:22110751
    review:
      summary: Duplicate with IDA evidence from heart valve study.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:22110751
          supporting_text: Inhibitory role of Notch1 in calcific aortic valve 
            disease.
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:22110751
    review:
      summary: Another duplicate with IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:22110751
          supporting_text: Inhibitory role of Notch1 in calcific aortic valve 
            disease.
  - term:
      id: GO:0003180
      label: aortic valve morphogenesis
    evidence_type: IDA
    original_reference_id: PMID:22110751
    review:
      summary: Specific heart valve development term with experimental evidence.
      action: KEEP_AS_NON_CORE
      reason: Heart valve morphogenesis is peripheral to core cartilage/glial 
        functions.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0003180 aortic valve morphogenesis biological_process
            ECO:0000314 IDA PMID:22110751"
        - reference_id: PMID:22110751
          supporting_text: Inhibitory role of Notch1 in calcific aortic valve 
            disease.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:22110751
    review:
      summary: Another duplicate from heart valve study.
      action: ACCEPT
      reason: Core function.
      supported_by:
        - reference_id: PMID:22110751
          supporting_text: Inhibitory role of Notch1 in calcific aortic valve 
            disease.
  - term:
      id: GO:0070168
      label: negative regulation of biomineral tissue development
    evidence_type: IDA
    original_reference_id: PMID:22110751
    review:
      summary: Duplicate of earlier annotation with IDA evidence from heart 
        valve study.
      action: ACCEPT
      reason: Part of core mechanism for maintaining cartilage over bone.
      supported_by:
        - reference_id: PMID:22110751
          supporting_text: Inhibitory role of Notch1 in calcific aortic valve 
            disease.
  - term:
      id: GO:0000981
      label: DNA-binding transcription factor activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:20484372
    review:
      summary: Multiple IDA evidence codes from different publications.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:20484372
          supporting_text: May 19. The dimerization domain of SOX9 is required 
            for transcription activation of a chondrocyte-specific chromatin DNA
            template.
  - term:
      id: GO:0000981
      label: DNA-binding transcription factor activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:21412441
    review:
      summary: Another IDA evidence from sex determination study.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:21412441
          supporting_text: Failure of SOX9 regulation in 46XY disorders of sex 
            development with SRY, SOX9 and SF1 mutations.
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:20484372
    review:
      summary: Duplicate IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:20484372
          supporting_text: May 19. The dimerization domain of SOX9 is required 
            for transcription activation of a chondrocyte-specific chromatin DNA
            template.
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:20530484
    review:
      summary: Another IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:1902894
      label: negative regulation of miRNA transcription
    evidence_type: IDA
    original_reference_id: PMID:26687115
    review:
      summary: SOX9 regulates miRNA expression in cartilage contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        While experimentally validated, miRNA regulation is a secondary regulatory
        mechanism rather than core transcription factor function.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:1902894 negative regulation of miRNA transcription
            biological_process ECO:0000314 IDA PMID:26687115"
        - reference_id: PMID:26687115
          supporting_text: 2015 Dec 19. The microRNA-29 family in cartilage 
            homeostasis and osteoarthritis.
  - term:
      id: GO:1990837
      label: sequence-specific double-stranded DNA binding
    evidence_type: IDA
    original_reference_id: PMID:28473536
    review:
      summary: Duplicate of earlier IEA annotation with IDA evidence.
      action: ACCEPT
      reason: Core molecular function with experimental support.
      supported_by:
        - reference_id: PMID:28473536
          supporting_text: Impact of cytosine methylation on DNA binding 
            specificities of human transcription factors.
  - term:
      id: GO:0001228
      label: DNA-binding transcription activator activity, RNA polymerase 
        II-specific
    evidence_type: IDA
    original_reference_id: PMID:31194875
    review:
      summary: More IDA evidence from transactivation domain study.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:31194875
          supporting_text: The SOXE transcription factors-SOX8, SOX9 and 
            SOX10-share a bi-partite transactivation mechanism.
  - term:
      id: GO:0043565
      label: sequence-specific DNA binding
    evidence_type: IDA
    original_reference_id: PMID:31194875
    review:
      summary: Duplicate with IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:31194875
          supporting_text: The SOXE transcription factors-SOX8, SOX9 and 
            SOX10-share a bi-partite transactivation mechanism.
  - term:
      id: GO:0002062
      label: chondrocyte differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Multiple evidence codes for this core function.
      action: ACCEPT
      reason: Core function with ISS evidence.
  - term:
      id: GO:0003430
      label: growth plate cartilage chondrocyte growth
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: ACCEPT
      reason: Part of core chondrogenic program.
  - term:
      id: GO:0045668
      label: negative regulation of osteoblast differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: ACCEPT
      reason: Core mechanism for maintaining chondrocyte identity.
  - term:
      id: GO:0046322
      label: negative regulation of fatty acid oxidation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Peripheral metabolic effect.
  - term:
      id: GO:0070542
      label: response to fatty acid
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Peripheral metabolic response.
  - term:
      id: GO:0000785
      label: chromatin
    evidence_type: ISA
    original_reference_id: GO_REF:0000113
    review:
      summary: |
        SOX9 binds chromatin as a transcription factor. Deep research notes it can act
        as a pioneer factor at super-enhancers.
      action: ACCEPT
      reason: |
        Chromatin localization is appropriate for a transcription factor that engages
        enhancers and promoters.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Can act as a pioneer factor at super-enhancers"
  - term:
      id: GO:0000981
      label: DNA-binding transcription factor activity, RNA polymerase 
        II-specific
    evidence_type: ISA
    original_reference_id: GO_REF:0000113
    review:
      summary: ISA evidence from TFClass database.
      action: ACCEPT
      reason: Core molecular function supported by database annotation.
  - term:
      id: GO:0010628
      label: positive regulation of gene expression
    evidence_type: IDA
    original_reference_id: PMID:24681825
    review:
      summary: Duplicate with IDA evidence.
      action: ACCEPT
      reason: Core transcriptional activator function.
      supported_by:
        - reference_id: PMID:24681825
          supporting_text: The NLR-related protein NWD1 is associated with 
            prostate cancer and modulates androgen receptor signaling.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:28263186
    review:
      summary: Another generic protein binding annotation (DDRGK1 interaction).
      action: REMOVE
      reason: |
        Generic protein binding term. While DDRGK1 interaction affects SOX9 ubiquitination,
        the generic term doesn't convey functional information.
      supported_by:
        - reference_id: PMID:28263186
          supporting_text: Mar 6. Loss of DDRGK1 modulates SOX9 ubiquitination 
            in spondyloepimetaphyseal dysplasia.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Multiple evidence codes for nuclear localization.
      action: ACCEPT
      reason: Well-established cellular component.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:26634652
    review:
      summary: IDA evidence for nuclear localization.
      action: ACCEPT
      reason: Well-established with experimental evidence.
      supported_by:
        - reference_id: PMID:26634652
          supporting_text: Valve Endothelial Cell-Derived Tgfβ1 Signaling 
            Promotes Nuclear Localization of Sox9 in Interstitial Cells 
            Associated With Attenuated Calcification.
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IDA
    original_reference_id: PMID:20530484
    review:
      summary: Another IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:0061036
      label: positive regulation of cartilage development
    evidence_type: IDA
    original_reference_id: PMID:29503843
    review:
      summary: SOX9 promotes cartilage development with IDA evidence.
      action: ACCEPT
      reason: |
        This is essentially a parent term encompassing SOX9's chondrogenic functions.
        Core function.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0061036 positive regulation of cartilage development
            biological_process ECO:0000314 IDA PMID:29503843"
        - reference_id: PMID:29503843
          supporting_text: Nov 2. Sox9 augments BMP2-induced chondrogenic 
            differentiation by downregulating Smad7 in mesenchymal stem cells 
            (MSCs).
  - term:
      id: GO:1902732
      label: positive regulation of chondrocyte proliferation
    evidence_type: IDA
    original_reference_id: PMID:29503843
    review:
      summary: SOX9 promotes chondrocyte proliferation in growth plate.
      action: ACCEPT
      reason: Part of core chondrogenic program maintaining columnar 
        proliferation.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "maintains chondrocyte columnar proliferation"
        - reference_id: PMID:29503843
          supporting_text: Nov 2. Sox9 augments BMP2-induced chondrogenic 
            differentiation by downregulating Smad7 in mesenchymal stem cells 
            (MSCs).
  - term:
      id: GO:0030279
      label: negative regulation of ossification
    evidence_type: IDA
    original_reference_id: PMID:29503843
    review:
      summary: Duplicate with IDA evidence.
      action: ACCEPT
      reason: Part of core mechanism.
      supported_by:
        - reference_id: PMID:29503843
          supporting_text: Nov 2. Sox9 augments BMP2-induced chondrogenic 
            differentiation by downregulating Smad7 in mesenchymal stem cells 
            (MSCs).
  - term:
      id: GO:0000122
      label: negative regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:29503843
    review:
      summary: More IDA evidence for repressive function.
      action: ACCEPT
      reason: Documented repressive capability.
      supported_by:
        - reference_id: PMID:29503843
          supporting_text: Nov 2. Sox9 augments BMP2-induced chondrogenic 
            differentiation by downregulating Smad7 in mesenchymal stem cells 
            (MSCs).
  - term:
      id: GO:0001502
      label: cartilage condensation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: |
        SOX9 is absolutely required for precartilaginous condensation, the first step
        in chondrogenesis.
      action: ACCEPT
      reason: |
        Cartilage condensation is the initial step in chondrogenesis where SOX9 is
        absolutely required. This is core chondrogenic function.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Absolutely required for precartilaginous condensation,
            the first step in chondrogenesis"
  - term:
      id: GO:0014036
      label: neural crest cell fate specification
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 is involved in neural crest development.
      action: KEEP_AS_NON_CORE
      reason: |
        Neural crest fate specification is peripheral to core cartilage/glial functions.
        While SOX9 may affect neural crest, this is not its primary role.
  - term:
      id: GO:0071773
      label: cellular response to BMP stimulus
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 responds to BMP signaling which regulates chondrogenesis.
      action: ACCEPT
      reason: |
        BMP signaling is central to chondrogenesis and SOX9 is a key effector of BMP
        responses in cartilage differentiation.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Acts in cooperation with the Hedgehog pathway-dependent
            GLI (GLI1 and GLI3) transcription factors"
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: TAS
    original_reference_id: Reactome:R-HSA-5626938
    review:
      summary: Duplicate nucleoplasm annotation from Reactome.
      action: ACCEPT
      reason: Appropriate sub-nuclear compartment.
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: TAS
    original_reference_id: Reactome:R-HSA-8985343
    review:
      summary: Another Reactome TAS annotation for nucleoplasm.
      action: ACCEPT
      reason: Appropriate sub-nuclear compartment.
  - term:
      id: GO:0032332
      label: positive regulation of chondrocyte differentiation
    evidence_type: IDA
    original_reference_id: PMID:21401405
    review:
      summary: More IDA evidence for core function.
      action: ACCEPT
      reason: Core chondrogenic function.
      supported_by:
        - reference_id: PMID:21401405
          supporting_text: Oct 21. Electroporation-mediated transfer of SOX trio
            genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of 
            mesenchymal stem cells.
  - term:
      id: GO:0061036
      label: positive regulation of cartilage development
    evidence_type: IDA
    original_reference_id: PMID:21401405
    review:
      summary: Duplicate with IDA evidence.
      action: ACCEPT
      reason: Core chondrogenic function.
      supported_by:
        - reference_id: PMID:21401405
          supporting_text: Oct 21. Electroporation-mediated transfer of SOX trio
            genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of 
            mesenchymal stem cells.
  - term:
      id: GO:0071560
      label: cellular response to transforming growth factor beta stimulus
    evidence_type: IDA
    original_reference_id: PMID:21401405
    review:
      summary: Duplicate with IDA evidence.
      action: ACCEPT
      reason: Part of core chondrogenic signaling response.
      supported_by:
        - reference_id: PMID:21401405
          supporting_text: Oct 21. Electroporation-mediated transfer of SOX trio
            genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of 
            mesenchymal stem cells.
  - term:
      id: GO:0003415
      label: chondrocyte hypertrophy
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: ACCEPT
      reason: Core chondrogenic program.
  - term:
      id: GO:0003682
      label: chromatin binding
    evidence_type: IDA
    original_reference_id: PMID:20484372
    review:
      summary: SOX9 binds chromatin with IDA evidence.
      action: ACCEPT
      reason: |
        Chromatin binding is a specific molecular function relevant to SOX9's role as a
        transcription factor engaging chromatin.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0003682 chromatin binding molecular_function ECO:0000314
            IDA PMID:20484372"
        - reference_id: PMID:20484372
          supporting_text: May 19. The dimerization domain of SOX9 is required 
            for transcription activation of a chondrocyte-specific chromatin DNA
            template.
  - term:
      id: GO:0006334
      label: nucleosome assembly
    evidence_type: IDA
    original_reference_id: PMID:20484372
    review:
      summary: |
        PMID:20484372 shows SOX9 dimerization is required for nucleosome assembly during
        chondrocyte-specific transcription activation.
      action: KEEP_AS_NON_CORE
      reason: |
        While experimentally supported, nucleosome assembly is a chromatin remodeling
        mechanism rather than a core transcription factor function. It's part of the
        mechanistic process but peripheral to the primary role.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0006334 nucleosome assembly biological_process ECO:0000314
            IDA PMID:20484372"
        - reference_id: PMID:20484372
          supporting_text: May 19. The dimerization domain of SOX9 is required 
            for transcription activation of a chondrocyte-specific chromatin DNA
            template.
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IDA
    original_reference_id: PMID:20484372
    review:
      summary: SOX9 is involved in chromatin remodeling at target genes.
      action: KEEP_AS_NON_CORE
      reason: |
        Chromatin remodeling is a mechanistic process supporting transcription activation
        but not a core defining function of SOX9.
      supported_by:
        - reference_id: PMID:20484372
          supporting_text: May 19. The dimerization domain of SOX9 is required 
            for transcription activation of a chondrocyte-specific chromatin DNA
            template.
  - term:
      id: GO:0007173
      label: epidermal growth factor receptor signaling pathway
    evidence_type: ISS
    original_reference_id: PMID:21512138
    review:
      summary: Duplicate with ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific signaling in epithelial tissues.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:0008284
      label: positive regulation of cell population proliferation
    evidence_type: IMP
    original_reference_id: PMID:20651055
    review:
      summary: SOX9 promotes proliferation in certain contexts (lung 
        adenocarcinoma study).
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 does promote chondrocyte proliferation (core function), this generic
        proliferation term from a cancer study represents peripheral effects rather than
        the specific chondrocyte proliferation that is core.
      supported_by:
        - reference_id: PMID:20651055
          supporting_text: Upregulation of SOX9 in lung adenocarcinoma and its 
            involvement in the regulation of cell growth and tumorigenicity.
  - term:
      id: GO:0010634
      label: positive regulation of epithelial cell migration
    evidence_type: IMP
    original_reference_id: PMID:21512138
    review:
      summary: SOX9 promotes epithelial cell migration in urothelial contexts.
      action: KEEP_AS_NON_CORE
      reason: Context-specific epithelial function, not core cartilage/glial 
        role.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:0045892
      label: negative regulation of DNA-templated transcription
    evidence_type: IMP
    original_reference_id: PMID:20651055
    review:
      summary: General transcriptional repression term with IMP evidence.
      action: ACCEPT
      reason: |
        SOX9 has documented repressive functions. More specific RNA Pol II term is
        preferred but this is acceptable.
      supported_by:
        - reference_id: PMID:20651055
          supporting_text: Upregulation of SOX9 in lung adenocarcinoma and its 
            involvement in the regulation of cell growth and tumorigenicity.
  - term:
      id: GO:0045893
      label: positive regulation of DNA-templated transcription
    evidence_type: IMP
    original_reference_id: PMID:20651055
    review:
      summary: General transcriptional activation term with IMP evidence.
      action: ACCEPT
      reason: |
        SOX9 is primarily a transcriptional activator. More specific RNA Pol II term is
        preferred but this is acceptable.
      supported_by:
        - reference_id: PMID:20651055
          supporting_text: Upregulation of SOX9 in lung adenocarcinoma and its 
            involvement in the regulation of cell growth and tumorigenicity.
  - term:
      id: GO:0070371
      label: ERK1 and ERK2 cascade
    evidence_type: ISS
    original_reference_id: PMID:21512138
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific signaling.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:0071260
      label: cellular response to mechanical stimulus
    evidence_type: ISS
    original_reference_id: PMID:21512138
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific response.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:0071364
      label: cellular response to epidermal growth factor stimulus
    evidence_type: ISS
    original_reference_id: PMID:21512138
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific response.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:0071504
      label: cellular response to heparin
    evidence_type: ISS
    original_reference_id: PMID:21512138
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific response.
      supported_by:
        - reference_id: PMID:21512138
          supporting_text: Epub 2011 Apr 21. An EGFR-ERK-SOX9 signaling cascade 
            links urothelial development and regeneration to cancer.
  - term:
      id: GO:2000020
      label: positive regulation of male gonad development
    evidence_type: IDA
    original_reference_id: PMID:21412441
    review:
      summary: SOX9 promotes testis development with IDA evidence.
      action: KEEP_AS_NON_CORE
      reason: |
        Sex determination is an important SOX9 function but peripheral to core cartilage/glial
        roles.
      supported_by:
        - reference_id: PMID:21412441
          supporting_text: Failure of SOX9 regulation in 46XY disorders of sex 
            development with SRY, SOX9 and SF1 mutations.
  - term:
      id: GO:2000741
      label: positive regulation of mesenchymal stem cell differentiation
    evidence_type: IDA
    original_reference_id: PMID:21401405
    review:
      summary: SOX9 promotes MSC differentiation toward chondrocytes.
      action: ACCEPT
      reason: |
        MSC differentiation toward chondrocytes is part of the chondrogenic program.
        This captures an earlier step in the lineage commitment.
      supported_by:
        - reference_id: PMID:21401405
          supporting_text: Oct 21. Electroporation-mediated transfer of SOX trio
            genes (SOX-5, SOX-6, and SOX-9) to enhance the chondrogenesis of 
            mesenchymal stem cells.
  - term:
      id: GO:0000987
      label: cis-regulatory region sequence-specific DNA binding
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate with ISS evidence.
      action: ACCEPT
      reason: Core molecular function.
  - term:
      id: GO:0001502
      label: cartilage condensation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: ACCEPT
      reason: Core first step in chondrogenesis.
  - term:
      id: GO:0001894
      label: tissue homeostasis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Peripheral maintenance function.
  - term:
      id: GO:0002683
      label: negative regulation of immune system process
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Peripheral immunomodulatory effect.
  - term:
      id: GO:0003170
      label: heart valve development
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Peripheral developmental function.
  - term:
      id: GO:0030279
      label: negative regulation of ossification
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: ACCEPT
      reason: Core mechanism for maintaining cartilage.
  - term:
      id: GO:0030850
      label: prostate gland development
    evidence_type: IEP
    original_reference_id: PMID:20103652
    review:
      summary: IEP evidence for prostate development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral epithelial development.
      supported_by:
        - reference_id: PMID:20103652
          supporting_text: 2010 Jan 26. SOX9 elevation in the prostate promotes 
            proliferation and cooperates with PTEN loss to drive tumor 
            formation.
  - term:
      id: GO:0050679
      label: positive regulation of epithelial cell proliferation
    evidence_type: IEP
    original_reference_id: PMID:20103652
    review:
      summary: IEP evidence from prostate study.
      action: KEEP_AS_NON_CORE
      reason: Context-specific epithelial proliferation, not core function.
      supported_by:
        - reference_id: PMID:20103652
          supporting_text: 2010 Jan 26. SOX9 elevation in the prostate promotes 
            proliferation and cooperates with PTEN loss to drive tumor 
            formation.
  - term:
      id: GO:0070168
      label: negative regulation of biomineral tissue development
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: ACCEPT
      reason: Core mechanism for maintaining cartilage.
  - term:
      id: GO:0071347
      label: cellular response to interleukin-1
    evidence_type: IEP
    original_reference_id: PMID:20079164
    review:
      summary: SOX9 responds to IL-1 in intervertebral disc cells.
      action: KEEP_AS_NON_CORE
      reason: Context-specific response in pathological conditions, not core 
        function.
      supported_by:
        - reference_id: PMID:20079164
          supporting_text: Interleukin-1 inhibits Sox9 and collagen type II 
            expression via nuclear factor-kappaB in the cultured human 
            intervertebral disc cells.
  - term:
      id: GO:0001708
      label: cell fate specification
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: |
        SOX9 specifies cell fates including chondrocyte, glial, and Sertoli cell fates.
      action: ACCEPT
      reason: |
        Cell fate specification is fundamental to SOX9's function as a lineage-determining
        transcription factor in chondrocytes and glia. This is core.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "essential for lineage specification... glial fate specification"
  - term:
      id: GO:0001837
      label: epithelial to mesenchymal transition
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 is involved in EMT in various developmental contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        EMT is a process that occurs in multiple developmental contexts but is not a
        core defining function of SOX9.
  - term:
      id: GO:0001942
      label: hair follicle development
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 plays roles in hair follicle development.
      action: KEEP_AS_NON_CORE
      reason: |
        Hair follicle development is peripheral epithelial function noted in deep research
        as one of multiple other programs.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Hair follicle morphogenesis"
  - term:
      id: GO:0002053
      label: positive regulation of mesenchymal cell proliferation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 promotes mesenchymal cell proliferation.
      action: KEEP_AS_NON_CORE
      reason: |
        While related to chondrogenesis (mesenchymal condensation), this generic
        proliferation term is broader than the specific chondrocyte proliferation that
        is core.
  - term:
      id: GO:0003179
      label: heart valve morphogenesis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence for heart valve.
      action: KEEP_AS_NON_CORE
      reason: Peripheral developmental function.
  - term:
      id: GO:0003203
      label: endocardial cushion morphogenesis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in heart cushion development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral cardiac development function.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:12420222
    review:
      summary: Multiple IDA evidence codes for nuclear localization.
      action: ACCEPT
      reason: Well-established with experimental evidence.
      supported_by:
        - reference_id: PMID:12420222
          supporting_text: 'RAR agonists stimulate SOX9 gene expression in breast
            cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.'
  - term:
      id: GO:0007283
      label: spermatogenesis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in spermatogenesis via Sertoli cell function.
      action: KEEP_AS_NON_CORE
      reason: Peripheral reproductive developmental function.
  - term:
      id: GO:0010564
      label: regulation of cell cycle process
    evidence_type: IMP
    original_reference_id: PMID:12420222
    review:
      summary: SOX9 can regulate cell cycle in certain contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 affects proliferation in chondrocytes, this generic cell cycle term
        is overly broad and not a core defining function.
      supported_by:
        - reference_id: PMID:12420222
          supporting_text: 'RAR agonists stimulate SOX9 gene expression in breast
            cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.'
  - term:
      id: GO:0019100
      label: male germ-line sex determination
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 is critical for male sex determination.
      action: KEEP_AS_NON_CORE
      reason: Important but peripheral to core cartilage/glial functions.
  - term:
      id: GO:0030858
      label: positive regulation of epithelial cell differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 promotes epithelial differentiation in multiple organs.
      action: KEEP_AS_NON_CORE
      reason: Generic epithelial differentiation is peripheral to core 
        functions.
  - term:
      id: GO:0030916
      label: otic vesicle formation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in inner ear development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sensory organ development.
  - term:
      id: GO:0032331
      label: negative regulation of chondrocyte differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: |
        SOX9 can negatively regulate chondrocyte differentiation at certain stages to
        maintain progenitor populations.
      action: ACCEPT
      reason: |
        This reflects SOX9's context-dependent role in maintaining chondrocyte progenitors
        versus promoting differentiation. Part of the nuanced chondrogenic program.
  - term:
      id: GO:0035019
      label: somatic stem cell population maintenance
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 maintains stem cell populations in various tissues.
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 can maintain stem/progenitor populations, this generic term doesn't
        capture the core cartilage/glial functions.
  - term:
      id: GO:0042127
      label: regulation of cell population proliferation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Very generic proliferation regulation term.
      action: MARK_AS_OVER_ANNOTATED
      reason: |
        Too generic to be informative. More specific terms about chondrocyte proliferation
        are preferred.
  - term:
      id: GO:0042981
      label: regulation of apoptotic process
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 may regulate apoptosis in certain contexts.
      action: KEEP_AS_NON_CORE
      reason: |
        Apoptosis regulation is a peripheral effect, not a core transcription factor
        function.
  - term:
      id: GO:0043066
      label: negative regulation of apoptotic process
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 may have anti-apoptotic effects.
      action: KEEP_AS_NON_CORE
      reason: Peripheral effect, not core function.
  - term:
      id: GO:0045662
      label: negative regulation of myoblast differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 inhibits myoblast differentiation.
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 promotes chondrocyte over other mesenchymal fates, myoblast inhibition
        is a peripheral effect.
  - term:
      id: GO:0046533
      label: negative regulation of photoreceptor cell differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in retinal development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral retinal development function.
  - term:
      id: GO:0050679
      label: positive regulation of epithelial cell proliferation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: KEEP_AS_NON_CORE
      reason: Context-specific epithelial proliferation.
  - term:
      id: GO:0050680
      label: negative regulation of epithelial cell proliferation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 can also negatively regulate epithelial proliferation 
        contextually.
      action: KEEP_AS_NON_CORE
      reason: Context-dependent epithelial regulation, peripheral function.
  - term:
      id: GO:0051216
      label: cartilage development
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate ISS evidence.
      action: ACCEPT
      reason: Core chondrogenic function.
  - term:
      id: GO:0060008
      label: Sertoli cell differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 promotes Sertoli cell differentiation.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sex determination function.
  - term:
      id: GO:0060041
      label: retina development in camera-type eye
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in retinal development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sensory organ development.
  - term:
      id: GO:0060221
      label: retinal rod cell differentiation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: More specific retinal development term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sensory cell differentiation.
  - term:
      id: GO:0060517
      label: epithelial cell proliferation involved in prostatic bud elongation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Highly specific prostate development term.
      action: KEEP_AS_NON_CORE
      reason: Very specific peripheral developmental process.
  - term:
      id: GO:0060729
      label: intestinal epithelial structure maintenance
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 maintains intestinal epithelium.
      action: KEEP_AS_NON_CORE
      reason: Peripheral tissue maintenance function.
  - term:
      id: GO:0060784
      label: regulation of cell proliferation involved in tissue homeostasis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Generic tissue homeostasis proliferation regulation.
      action: KEEP_AS_NON_CORE
      reason: Peripheral maintenance function.
  - term:
      id: GO:0061138
      label: morphogenesis of a branching epithelium
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate of earlier epithelial morphogenesis annotation.
      action: KEEP_AS_NON_CORE
      reason: Peripheral epithelial morphogenesis.
  - term:
      id: GO:0071300
      label: cellular response to retinoic acid
    evidence_type: IEP
    original_reference_id: PMID:12420222
    review:
      summary: SOX9 responds to retinoic acid.
      action: KEEP_AS_NON_CORE
      reason: Contextual signaling response, not core function.
      supported_by:
        - reference_id: PMID:12420222
          supporting_text: 'RAR agonists stimulate SOX9 gene expression in breast
            cancer cell lines: evidence for a role in retinoid-mediated growth inhibition.'
  - term:
      id: GO:0072289
      label: metanephric nephron tubule formation
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: More specific kidney development term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development.
  - term:
      id: GO:0090090
      label: negative regulation of canonical Wnt signaling pathway
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 antagonizes Wnt/beta-catenin signaling.
      action: ACCEPT
      reason: |
        Wnt/beta-catenin antagonism is a core mechanism by which SOX9 maintains chondrocyte
        identity and blocks osteoblast differentiation.
      supported_by:
        - reference_id: SOX9-deep-research-falcon.md
          supporting_text: "Antagonizes β-catenin in chondrocytes"
  - term:
      id: GO:0090103
      label: cochlea morphogenesis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: SOX9 involved in inner ear cochlea development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sensory organ development.
  - term:
      id: GO:0001501
      label: skeletal system development
    evidence_type: IMP
    original_reference_id: PMID:8640233
    review:
      summary: |
        Broad term for skeletal development with IMP evidence from foundational SOX9
        study.
      action: ACCEPT
      reason: |
        Skeletal system development encompasses SOX9's chondrogenic functions. While
        broad, this is a core developmental process for SOX9.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0001501 skeletal system development biological_process
            ECO:0000315 IMP PMID:8640233"
        - reference_id: PMID:8640233
          supporting_text: Sex reversal by loss of the C-terminal 
            transactivation domain of human SOX9.
  - term:
      id: GO:0003413
      label: chondrocyte differentiation involved in endochondral bone 
        morphogenesis
    evidence_type: IMP
    original_reference_id: PMID:20676705
    review:
      summary: |
        More specific term for chondrocyte differentiation in context of endochondral
        ossification.
      action: ACCEPT
      reason: |
        This captures the specific developmental context where SOX9-driven chondrogenesis
        creates the cartilage template for bone formation. Core function.
      supported_by:
        - reference_id: SOX9-goa.tsv
          supporting_text: "GO:0003413 chondrocyte differentiation involved in endochondral
            bone morphogenesis biological_process ECO:0000315 IMP PMID:20676705"
        - reference_id: PMID:20676705
          supporting_text: 2010 Jul 30. Generation of transgenic mice for 
            conditional overexpression of Sox9.
  - term:
      id: GO:0003700
      label: DNA-binding transcription factor activity
    evidence_type: IMP
    original_reference_id: PMID:8640233
    review:
      summary: IMP evidence from foundational study.
      action: ACCEPT
      reason: Core molecular function with experimental evidence.
      supported_by:
        - reference_id: PMID:8640233
          supporting_text: Sex reversal by loss of the C-terminal 
            transactivation domain of human SOX9.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:8640233
    review:
      summary: More IDA evidence for nuclear localization.
      action: ACCEPT
      reason: Well-established cellular component.
      supported_by:
        - reference_id: PMID:8640233
          supporting_text: Sex reversal by loss of the C-terminal 
            transactivation domain of human SOX9.
  - term:
      id: GO:0008584
      label: male gonad development
    evidence_type: IMP
    original_reference_id: PMID:8640233
    review:
      summary: IMP evidence for testis development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sex determination function.
      supported_by:
        - reference_id: PMID:8640233
          supporting_text: Sex reversal by loss of the C-terminal 
            transactivation domain of human SOX9.
  - term:
      id: GO:0032332
      label: positive regulation of chondrocyte differentiation
    evidence_type: IMP
    original_reference_id: PMID:20676705
    review:
      summary: More IMP evidence for core function.
      action: ACCEPT
      reason: Core chondrogenic function.
      supported_by:
        - reference_id: PMID:20676705
          supporting_text: 2010 Jul 30. Generation of transgenic mice for 
            conditional overexpression of Sox9.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:8640233
    review:
      summary: IDA evidence from foundational study.
      action: ACCEPT
      reason: Core transcriptional activator function.
      supported_by:
        - reference_id: PMID:8640233
          supporting_text: Sex reversal by loss of the C-terminal 
            transactivation domain of human SOX9.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:18512230
    review:
      summary: More IDA evidence for nucleus.
      action: ACCEPT
      reason: Well-established.
      supported_by:
        - reference_id: PMID:18512230
          supporting_text: Quantitative assessment of glial cells in the human 
            and guinea pig enteric nervous system with an anti-Sox8/9/10 
            antibody.
  - term:
      id: GO:0000987
      label: cis-regulatory region sequence-specific DNA binding
    evidence_type: IDA
    original_reference_id: PMID:10805756
    review:
      summary: IDA evidence for sequence-specific binding.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:10805756
          supporting_text: Phosphorylation of SOX9 by cyclic AMP-dependent 
            protein kinase A enhances SOX9's ability to transactivate a Col2a1 
            chondrocyte-specific enhancer.
  - term:
      id: GO:0003700
      label: DNA-binding transcription factor activity
    evidence_type: IDA
    original_reference_id: PMID:10805756
    review:
      summary: More IDA evidence.
      action: ACCEPT
      reason: Core molecular function.
      supported_by:
        - reference_id: PMID:10805756
          supporting_text: Phosphorylation of SOX9 by cyclic AMP-dependent 
            protein kinase A enhances SOX9's ability to transactivate a Col2a1 
            chondrocyte-specific enhancer.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:20530484
    review:
      summary: Another generic protein binding (MITF/OTX2 interactions).
      action: REMOVE
      reason: Generic protein binding term, uninformative.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:10805756
    review:
      summary: More IDA evidence.
      action: ACCEPT
      reason: Well-established.
      supported_by:
        - reference_id: PMID:10805756
          supporting_text: Phosphorylation of SOX9 by cyclic AMP-dependent 
            protein kinase A enhances SOX9's ability to transactivate a Col2a1 
            chondrocyte-specific enhancer.
  - term:
      id: GO:0032991
      label: protein-containing complex
    evidence_type: IDA
    original_reference_id: PMID:20530484
    review:
      summary: |
        SOX9 forms complexes with partners. This is a very generic cellular component
        term.
      action: MARK_AS_OVER_ANNOTATED
      reason: |
        Too generic. More specific terms like "transcription regulator complex" better
        capture SOX9's complex formation.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:0034236
      label: protein kinase A catalytic subunit binding
    evidence_type: IPI
    original_reference_id: PMID:10805756
    review:
      summary: |
        SOX9 interacts with PKA which phosphorylates it to enhance activity. This is
        a specific binding term.
      action: ACCEPT
      reason: |
        PKA binding and phosphorylation is a specific regulatory mechanism for SOX9
        activity. Unlike generic protein binding, this conveys functional information.
      supported_by:
        - reference_id: P48436.uniprot.txt
          supporting_text: "Phosphorylation at Ser-64 and Ser-211 by PKA increases
            transcriptional activity"
        - reference_id: PMID:10805756
          supporting_text: Phosphorylation of SOX9 by cyclic AMP-dependent 
            protein kinase A enhances SOX9's ability to transactivate a Col2a1 
            chondrocyte-specific enhancer.
  - term:
      id: GO:0045893
      label: positive regulation of DNA-templated transcription
    evidence_type: IDA
    original_reference_id: PMID:10805756
    review:
      summary: IDA evidence for transcriptional activation.
      action: ACCEPT
      reason: Core activator function.
      supported_by:
        - reference_id: PMID:10805756
          supporting_text: Phosphorylation of SOX9 by cyclic AMP-dependent 
            protein kinase A enhances SOX9's ability to transactivate a Col2a1 
            chondrocyte-specific enhancer.
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:20530484
    review:
      summary: More IDA evidence.
      action: ACCEPT
      reason: Core function.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:0065003
      label: protein-containing complex assembly
    evidence_type: IDA
    original_reference_id: PMID:20530484
    review:
      summary: SOX9 assembles into protein complexes.
      action: KEEP_AS_NON_CORE
      reason: |
        While SOX9 does form complexes, this generic assembly term doesn't capture the
        core transcription factor function.
      supported_by:
        - reference_id: PMID:20530484
          supporting_text: Epub 2010 Jun 8. SOX9, through interaction with 
            microphthalmia-associated transcription factor (MITF) and OTX2, 
            regulates BEST1 expression in the retinal pigment epithelium.
  - term:
      id: GO:0007165
      label: signal transduction
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate of earlier very generic signal transduction term.
      action: MARK_AS_OVER_ANNOTATED
      reason: Too generic to be informative.
  - term:
      id: GO:0072034
      label: renal vesicle induction
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate kidney development term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development.
  - term:
      id: GO:0090184
      label: positive regulation of kidney development
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate kidney development term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development.
  - term:
      id: GO:0090190
      label: positive regulation of branching involved in ureteric bud 
        morphogenesis
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate kidney branching term.
      action: KEEP_AS_NON_CORE
      reason: Peripheral kidney development.
  - term:
      id: GO:0008584
      label: male gonad development
    evidence_type: IEP
    original_reference_id: PMID:17848411
    review:
      summary: IEP evidence for testis development.
      action: KEEP_AS_NON_CORE
      reason: Peripheral sex determination function.
      supported_by:
        - reference_id: PMID:17848411
          supporting_text: Epub 2007 Sep 11. Developmental changes in human 
            fetal testicular cell numbers and messenger ribonucleic acid levels 
            during the second trimester.
references:
  - id: GO_REF:0000024
    title: Manual transfer of experimentally-verified manual GO annotation data 
      to orthologs by curator judgment of sequence similarity
    findings: []
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings: []
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings: []
  - id: GO_REF:0000052
    title: Gene Ontology annotation based on curation of immunofluorescence data
    findings: []
  - id: GO_REF:0000107
    title: Automatic transfer of experimentally verified manual GO annotation 
      data to orthologs using Ensembl Compara
    findings: []
  - id: GO_REF:0000113
    title: Gene Ontology annotation of human sequence-specific DNA binding 
      transcription factors (DbTFs) based on the TFClass database
    findings: []
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning
      models
    findings: []
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: SOX9-deep-research-falcon.md
    title: Deep research report on SOX9 molecular function and pathways
    findings:
      - statement: SOX9 is a SOXE-family transcription factor that binds AACAAT 
          motifs
      - statement: Functions in nucleus with nuclear localization signals
      - statement: Cooperates with SOX5/6 on paired SOX sites for cartilage 
          genes
      - statement: Recruits co-activators CBP/p300 and TIP60
      - statement: Antagonizes beta-catenin in chondrocytes
      - statement: Core functions are chondrogenesis and 
          gliogenesis/oligodendrocyte differentiation
  - id: P48436.uniprot.txt
    title: UniProt entry for human SOX9
    findings:
      - statement: Contains HMG-box DNA-binding domain (residues 105-173)
      - statement: Transcription factor that plays key role in chondrocyte 
          differentiation
      - statement: Binds 5'-ACAAAG-3' DNA motif in enhancers
      - statement: Nuclear localization
      - statement: Homodimerization required for activity
      - statement: Has transactivation domains TAM and TAC
      - statement: Phosphorylation by PKA increases transcriptional activity
      - statement: Antagonizes beta-catenin signaling
  - id: SOX9-goa.tsv
    title: GO annotations for SOX9 from GOA file
    findings:
      - statement: Multiple IDA/IMP/ISS evidence codes for chondrocyte 
          differentiation
      - statement: IDA evidence for transcription factor activity
      - statement: Nuclear localization validated
      - statement: Multiple experimental evidence codes for transcriptional 
          activation
  - id: CLAUDE.md
    title: Project curation guidelines
    findings:
      - statement: Avoid generic 'protein binding' terms
      - statement: Focus on core molecular functions
      - statement: Distinguish core vs peripheral developmental processes
  - id: PMID:8640233
    title: 'Sex reversal by loss of the C-terminal transactivation domain of human
      SOX9.'
    findings: []
  - id: PMID:10805756
    title: "Phosphorylation of SOX9 by cyclic AMP-dependent protein kinase A enhances
      SOX9's ability to transactivate a Col2a1 chondrocyte-specific enhancer."
    findings: []
  - id: PMID:12420222
    title: 'RAR agonists stimulate SOX9 gene expression in breast cancer cell lines:
      evidence for a role in retinoid-mediated growth inhibition.'
    findings: []
  - id: PMID:12810722
    title: 'A SOX9 defect of calmodulin-dependent nuclear import in campomelic dysplasia/autosomal
      sex reversal.'
    findings: []
  - id: PMID:17848411
    title: 'Developmental changes in human fetal testicular cell numbers and messenger
      ribonucleic acid levels during the second trimester.'
    findings: []
  - id: PMID:18512230
    title: 'Quantitative assessment of glial cells in the human and guinea pig enteric
      nervous system with an anti-Sox8/9/10 antibody.'
    findings: []
  - id: PMID:20079164
    title: 'Interleukin-1 inhibits Sox9 and collagen type II expression via nuclear
      factor-kappaB in the cultured human intervertebral disc cells.'
    findings: []
  - id: PMID:20103652
    title: 'SOX9 elevation in the prostate promotes proliferation and cooperates with
      PTEN loss to drive tumor formation.'
    findings: []
  - id: PMID:20484372
    title: 'The dimerization domain of SOX9 is required for transcription activation
      of a chondrocyte-specific chromatin DNA template.'
    findings: []
  - id: PMID:20530484
    title: 'SOX9, through interaction with microphthalmia-associated transcription
      factor (MITF) and OTX2, regulates BEST1 expression in the retinal pigment epithelium.'
    findings: []
  - id: PMID:20651055
    title: 'Upregulation of SOX9 in lung adenocarcinoma and its involvement in the
      regulation of cell growth and tumorigenicity.'
    findings: []
  - id: PMID:20676705
    title: 'Generation of transgenic mice for conditional overexpression of Sox9.'
    findings: []
  - id: PMID:21346191
    title: 'Arid5a cooperates with Sox9 to stimulate chondrocyte-specific transcription.'
    findings: []
  - id: PMID:21367821
    title: 'Sox9 sustains chondrocyte survival and hypertrophy in part through Pik3ca-Akt
      pathways.'
    findings: []
  - id: PMID:21401405
    title: 'Electroporation-mediated transfer of SOX trio genes (SOX-5, SOX-6, and
      SOX-9) to enhance the chondrogenesis of mesenchymal stem cells.'
    findings: []
  - id: PMID:21412441
    title: 'Failure of SOX9 regulation in 46XY disorders of sex development with SRY,
      SOX9 and SF1 mutations.'
    findings: []
  - id: PMID:21512138
    title: 'An EGFR-ERK-SOX9 signaling cascade links urothelial development and regeneration
      to cancer.'
    findings: []
  - id: PMID:22110751
    title: 'Inhibitory role of Notch1 in calcific aortic valve disease.'
    findings: []
  - id: PMID:24014021
    title: 'miR-1247 functions by targeting cartilage transcription factor SOX9.'
    findings: []
  - id: PMID:24681825
    title: 'The NLR-related protein NWD1 is associated with prostate cancer and modulates
      androgen receptor signaling.'
    findings: []
  - id: PMID:26634652
    title: 'Valve Endothelial Cell-Derived Tgfβ1 Signaling Promotes Nuclear Localization
      of Sox9 in Interstitial Cells Associated With Attenuated Calcification.'
    findings: []
  - id: PMID:26687115
    title: 'The microRNA-29 family in cartilage homeostasis and osteoarthritis.'
    findings: []
  - id: PMID:28263186
    title: 'Loss of DDRGK1 modulates SOX9 ubiquitination in spondyloepimetaphyseal
      dysplasia.'
    findings: []
  - id: PMID:28473536
    title: 'Impact of cytosine methylation on DNA binding specificities of human transcription
      factors.'
    findings: []
  - id: PMID:29503843
    title: 'Sox9 augments BMP2-induced chondrogenic differentiation by downregulating
      Smad7 in mesenchymal stem cells (MSCs).'
    findings: []
  - id: PMID:31194875
    title: 'The SOXE transcription factors-SOX8, SOX9 and SOX10-share a bi-partite
      transactivation mechanism.'
    findings: []
  - id: Reactome:R-HSA-5626938
    title: Reactome pathway reference
    findings: []
  - id: Reactome:R-HSA-8985343
    title: Reactome pathway reference
    findings: []
  - id: file:human/SOX9/SOX9-deep-research-falcon.md
    title: Deep research report on SOX9
    findings: []
core_functions: []