SOX2 is a SOXB1 family transcription factor containing an HMG-box domain that binds the minor groove of DNA and functions as a pioneer factor. As a core pluripotency factor (one of the Yamanaka factors), SOX2 maintains embryonic stem cell self-renewal and neural stem cell identity. It cooperates with OCT4 on composite Sox/Oct DNA motifs to regulate thousands of enhancers controlling pluripotency and early neural fate specification. SOX2 is essential for maintaining neural progenitor cells in an undifferentiated state and preventing premature neuronal differentiation. Nuclear localization is regulated by NLS/NES sequences and post-translational modifications including methylation, acetylation, SUMOylation, and ubiquitination.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0000122 negative regulation of transcription by RNA polymerase II | IBA GO_REF:0000033 | ACCEPT | Summary: SOX2 functions as both a transcriptional activator and repressor depending on context. SUMOylation of SOX2 enables transcriptional repression of centrosome/centromere and cell-cycle genes in neural stem cells, providing proliferative restraint. Reason: This annotation accurately represents a documented function of SOX2. The deep research shows SUMOylation-dependent repression of cell-cycle genes in neural stem cells. While SOX2 is primarily an activator, its repressor function is well-established and represents a core regulatory mechanism for controlling neural stem cell proliferation. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md In neural stem cells, SUMOylation of SOX2 is required for transcriptional repression of centrosome/centromere and cell-cycle genes and for proliferative restraint |
| GO:0000122 negative regulation of transcription by RNA polymerase II | ISS GO_REF:0000024 | ACCEPT | Summary: ISS evidence from mouse orthologs supports the repressor function of SOX2. Reason: ISS annotation based on ortholog data is consistent with experimental evidence from human SOX2 showing transcriptional repression. This is a valid inference from sequence similarity given the highly conserved nature of SOX2 function across mammals. |
| GO:0045944 positive regulation of transcription by RNA polymerase II | IBA GO_REF:0000033 | ACCEPT | Summary: SOX2 is fundamentally a transcriptional activator that cooperates with OCT4 to activate thousands of enhancers controlling pluripotency and neural fate genes. This is the primary and core molecular function of SOX2. Reason: This annotation represents the core function of SOX2 as a transcriptional activator. Deep research shows SOX2 and OCT4 co-occupy thousands of OSN enhancers in pluripotent cells and activate genes essential for pluripotency and neural specification. Multiple IBA, IDA, and IEA annotations converge on this fundamental activity. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md SOX2 and OCT4 co-occupy thousands of OSN (OCT4/SOX2/NANOG) enhancers in pluripotent cells file:genes/human/SOX2/SOX2-deep-research-falcon.md 1,898 SOX2-dependent neural-associated enhancers among 8,531 OSN-bound enhancers |
| GO:0045944 positive regulation of transcription by RNA polymerase II | IEA GO_REF:0000107 | ACCEPT | Summary: Electronic annotation based on ortholog data from Ensembl. Reason: Consistent with IBA and IDA evidence for transcriptional activation. This electronic annotation accurately reflects SOX2's primary function. |
| GO:0045944 positive regulation of transcription by RNA polymerase II | IDA PMID:21245162 Pluripotency factors regulate definitive endoderm specificat... | ACCEPT | Summary: Direct experimental evidence for SOX2 transcriptional activation. Reason: IDA evidence provides direct experimental support for transcriptional activation function, consistent with the core role of SOX2. Supporting Evidence: PMID:21245162 Pluripotency factors regulate definitive endoderm specification through eomesodermin. |
| GO:0045944 positive regulation of transcription by RNA polymerase II | IDA PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveo... | ACCEPT | Summary: Independent IDA evidence for transcriptional activation. Reason: Multiple independent experimental studies confirm transcriptional activation as a core SOX2 function. Supporting Evidence: PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveolar mucin in mucinous cancers of the colorectum and related lesions. |
| GO:0045893 positive regulation of DNA-templated transcription | IDA PMID:29253717 Regulation of ADAM10 by miR-140-5p and potential relevance f... | ACCEPT | Summary: IDA evidence for positive regulation of transcription. Reason: This is a parent term of RNA pol II-specific transcriptional activation and accurately represents SOX2's core function. The term is at an appropriate level of specificity for general transcriptional activation function. Supporting Evidence: PMID:29253717 Regulation of ADAM10 by miR-140-5p and potential relevance for Alzheimer's disease. |
| GO:0045893 positive regulation of DNA-templated transcription | IDA PMID:18407919 Novel mutations in LHX3 are associated with hypopituitarism ... | ACCEPT | Summary: Additional IDA evidence for transcriptional activation. Reason: Multiple experimental studies support this fundamental function of SOX2 as a transcriptional activator. Supporting Evidence: PMID:18407919 Apr 10. Novel mutations in LHX3 are associated with hypopituitarism and sensorineural hearing loss. |
| GO:0006355 regulation of DNA-templated transcription | IEA GO_REF:0000002 | ACCEPT | Summary: Electronic annotation based on InterPro domain IPR022097 (SOX family). Reason: This is a valid high-level annotation based on domain architecture. All SOX family transcription factors regulate transcription, and this annotation is appropriately general. While less specific than the positive/negative regulation terms, it is not incorrect. |
| GO:0006355 regulation of DNA-templated transcription | IDA PMID:16153702 Core transcriptional regulatory circuitry in human embryonic... | ACCEPT | Summary: IDA evidence for general transcriptional regulation. Reason: This parent term is supported by experimental evidence and is appropriately general for describing SOX2's overall transcriptional regulatory function. Supporting Evidence: PMID:16153702 Core transcriptional regulatory circuitry in human embryonic stem cells. |
| GO:0006355 regulation of DNA-templated transcription | NAS PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2... | ACCEPT | Summary: Non-traceable author statement from the original SOX2 cloning paper. Reason: Historical NAS annotation from the original characterization of SOX2 is appropriate for general transcriptional regulation function. Supporting Evidence: PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2 gene. |
| GO:0010468 regulation of gene expression | IMP PMID:18388306 Regulation of self-renewal and pluripotency by Sox2 in human... | ACCEPT | Summary: IMP evidence showing mutant phenotype affecting gene expression regulation. Reason: This is a valid high-level annotation demonstrating SOX2's role in gene expression control through mutant phenotype analysis. While very general, it is appropriate as a parent term encompassing transcriptional regulation. Supporting Evidence: PMID:18388306 Apr 3. Regulation of self-renewal and pluripotency by Sox2 in human embryonic stem cells. |
| GO:0030182 neuron differentiation | IBA GO_REF:0000033 | MODIFY | Summary: SOX2 plays a complex role in neuron differentiation by maintaining neural progenitors in an undifferentiated state and preventing premature neuronal differentiation. Reason: This term is ambiguous for SOX2's actual role. SOX2 does NOT promote neuron differentiation; rather, it prevents premature differentiation by maintaining neural progenitor identity. A more accurate term would be GO:0045665 (negative regulation of neuron differentiation), which is already present in the annotation set. The IBA annotation likely captures involvement in the process broadly, but this could be misleading about SOX2's actual function. Proposed replacements: negative regulation of neuron differentiation Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md Keeps neural cells undifferentiated by counteracting the activity of proneural proteins and suppresses neuronal differentiation UniProtKB:P48431 Keeps neural cells undifferentiated by counteracting the activity of proneural proteins and suppresses neuronal differentiation |
| GO:0045665 negative regulation of neuron differentiation | ISS GO_REF:0000024 | ACCEPT | Summary: SOX2 actively suppresses neuronal differentiation to maintain neural progenitor cells in an undifferentiated state. This is a core function in neural development. Reason: This annotation accurately captures SOX2's essential role in preventing premature neuronal differentiation. UniProt states that SOX2 "keeps neural cells undifferentiated by counteracting the activity of proneural proteins and suppresses neuronal differentiation." This is central to its function in neural stem cell maintenance and represents a core activity. Supporting Evidence: UniProtKB:P48431 Keeps neural cells undifferentiated by counteracting the activity of proneural proteins and suppresses neuronal differentiation |
| GO:0097150 neuronal stem cell population maintenance | ISS GO_REF:0000024 | ACCEPT | Summary: SOX2 is essential for maintaining neural stem cell identity and self-renewal. This is one of its core functions in the nervous system. Reason: This annotation represents a core function of SOX2 in neural biology. Deep research shows SOX2 is critical for neural stem cell maintenance and is described as a factor that "keeps neural cells undifferentiated." The term accurately captures SOX2's essential role in maintaining the neural stem cell pool. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md Downstream SRRT target that mediates the promotion of neural stem cell self-renewal |
| GO:0007420 brain development | IBA GO_REF:0000033 | KEEP AS NON CORE | Summary: SOX2 plays essential roles in brain development through maintaining neural progenitor populations and regulating neural fate specification. Reason: While SOX2 is indeed involved in brain development, this term is very broad and captures pleiotropy rather than core molecular function. The more specific neural stem cell maintenance and neural specification functions are better representations of SOX2's primary roles. This annotation is not incorrect but represents a higher-level developmental outcome rather than the core cellular function. |
| GO:0030900 forebrain development | IBA GO_REF:0000033 | KEEP AS NON CORE | Summary: SOX2 expression and function in forebrain development is well-documented. Reason: This is a more specific developmental process than general brain development, but still represents a regional/developmental outcome rather than core molecular function. SOX2 functions the same way (maintaining neural progenitors) across brain regions. The forebrain-specific annotation reflects where SOX2 is expressed and important, but the core function is neural progenitor maintenance regardless of brain region. |
| GO:0030900 forebrain development | IEP PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | KEEP AS NON CORE | Summary: Expression pattern evidence showing SOX2 expression during forebrain development. Reason: IEP evidence showing expression pattern during forebrain development is valid but does not demonstrate specific function. This is consistent with SOX2's role in maintaining neural progenitors throughout the developing brain including forebrain regions. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0021781 glial cell fate commitment | NAS PMID:17291498 Sox-2 is expressed by glial and progenitor cells and Pax-6 i... | KEEP AS NON CORE | Summary: NAS evidence for role in glial cell fate commitment. Reason: While SOX2 is expressed in glial progenitors and can influence glial fate, this represents one specific outcome of SOX2's more general role in maintaining progenitor identity. The core function is maintaining undifferentiated stem/progenitor states; glial fate commitment is one context-dependent outcome. This is valid but peripheral to core function. Supporting Evidence: PMID:17291498 2006 Dec 20. Sox-2 is expressed by glial and progenitor cells and Pax-6 is expressed by neuroblasts in the human subventricular zone. |
| GO:0035019 somatic stem cell population maintenance | IMP PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch fr... | ACCEPT | Summary: IMP evidence showing SOX2 is required for maintaining somatic stem cell populations, particularly neural stem cells. Reason: This annotation represents a core function of SOX2. Multiple independent IMP and IDA studies demonstrate SOX2's essential role in maintaining stem cell populations. This encompasses both embryonic and neural stem cell maintenance and represents a fundamental cellular function of SOX2. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md Critical for early embryogenesis and for embryonic stem cell pluripotency PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch from stem cell pluripotency to specifying a cardiac fate. |
| GO:0035019 somatic stem cell population maintenance | IDA PMID:19409607 MicroRNA-145 regulates OCT4, SOX2, and KLF4 and represses pl... | ACCEPT | Summary: Independent IDA evidence for stem cell maintenance. Reason: Multiple independent experimental studies support this core function. Supporting Evidence: PMID:19409607 Apr 30. MicroRNA-145 regulates OCT4, SOX2, and KLF4 and represses pluripotency in human embryonic stem cells. |
| GO:0035019 somatic stem cell population maintenance | IMP PMID:18388306 Regulation of self-renewal and pluripotency by Sox2 in human... | ACCEPT | Summary: Additional IMP evidence from mutant phenotype analysis. Reason: Mutant phenotype evidence provides strong support for essential role in stem cell maintenance. Supporting Evidence: PMID:18388306 Apr 3. Regulation of self-renewal and pluripotency by Sox2 in human embryonic stem cells. |
| GO:1902807 negative regulation of cell cycle G1/S phase transition | IDA PMID:18268498 SOX2 is frequently downregulated in gastric cancers and inhi... | ACCEPT | Summary: IDA evidence for SOX2 role in cell cycle regulation. Reason: This annotation is supported by direct experimental evidence and is consistent with SOX2's role in maintaining progenitor cells in a self-renewing state. Cell cycle regulation is an integral part of SOX2's function in controlling stem cell proliferation versus differentiation decisions. Supporting Evidence: PMID:18268498 Feb 12. SOX2 is frequently downregulated in gastric cancers and inhibits cell growth through cell-cycle arrest and apoptosis. |
| GO:0043410 positive regulation of MAPK cascade | IDA PMID:18187129 Forced expression of Sox2 or Nanog in human bone marrow deri... | KEEP AS NON CORE | Summary: IDA evidence for SOX2 involvement in MAPK signaling. Reason: While experimentally supported, MAPK cascade regulation represents a context-specific signaling outcome rather than a core molecular function. SOX2's primary function is as a transcription factor; MAPK regulation may be an indirect consequence or occur in specific cellular contexts (e.g., mesenchymal stem cells in this study). This is valid but peripheral to core transcriptional regulatory function. Supporting Evidence: PMID:18187129 Epub 2007 Dec 4. Forced expression of Sox2 or Nanog in human bone marrow derived mesenchymal stem cells maintains their expansion and differentiation capabilities. |
| GO:0048839 inner ear development | IBA GO_REF:0000033 | KEEP AS NON CORE | Summary: SOX2 expression and function in inner ear development. Reason: SOX2 plays roles in sensory organ development including inner ear, but this represents tissue-specific developmental pleiotropy rather than core function. The core function is maintaining progenitor populations; inner ear development is one of many developmental contexts where this occurs. |
| GO:0048839 inner ear development | IEP PMID:18407919 Novel mutations in LHX3 are associated with hypopituitarism ... | KEEP AS NON CORE | Summary: Expression pattern evidence during inner ear development. Reason: IEP evidence supports expression during inner ear development but does not demonstrate specific function. Consistent with SOX2's broader role in sensory progenitor maintenance. Supporting Evidence: PMID:18407919 Apr 10. Novel mutations in LHX3 are associated with hypopituitarism and sensorineural hearing loss. |
| GO:0001654 eye development | IEP PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | KEEP AS NON CORE | Summary: Expression pattern during eye development. Reason: SOX2 mutations cause anophthalmia/microphthalmia, demonstrating clear importance in eye development. However, this represents tissue-specific developmental outcome rather than core molecular function. Like inner ear development, eye development is one context where SOX2's progenitor-maintaining function is critical. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0021983 pituitary gland development | IEP PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | KEEP AS NON CORE | Summary: Expression pattern during pituitary development. Reason: Another tissue-specific developmental context where SOX2 maintains progenitor populations. Valid annotation but represents developmental pleiotropy rather than core cellular function. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0001714 endodermal cell fate specification | IDA PMID:21245162 Pluripotency factors regulate definitive endoderm specificat... | KEEP AS NON CORE | Summary: IDA evidence for role in endoderm specification. Reason: SOX2 with OCT4 regulates germ layer specification including endoderm fate. While experimentally supported, this represents one developmental context among many. SOX2's core function is maintaining pluripotency and regulating lineage choice; endoderm specification is one specific outcome. Supporting Evidence: PMID:21245162 Pluripotency factors regulate definitive endoderm specification through eomesodermin. |
| GO:0001649 osteoblast differentiation | IDA PMID:18187129 Forced expression of Sox2 or Nanog in human bone marrow deri... | KEEP AS NON CORE | Summary: IDA evidence for SOX2 role in osteoblast differentiation when ectopically expressed in mesenchymal stem cells. Reason: This represents an experimental manipulation (forced SOX2 expression in mesenchymal stem cells) rather than SOX2's endogenous core function. While experimentally valid, osteoblast differentiation is not a physiological context where SOX2 normally functions and represents experimental pleiotropy. Supporting Evidence: PMID:18187129 Epub 2007 Dec 4. Forced expression of Sox2 or Nanog in human bone marrow derived mesenchymal stem cells maintains their expansion and differentiation capabilities. |
| GO:0090090 negative regulation of canonical Wnt signaling pathway | IDA PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | KEEP AS NON CORE | Summary: IDA evidence for SOX2 regulation of Wnt signaling. Reason: While experimentally supported, Wnt pathway regulation represents cross-talk between SOX2's transcriptional program and developmental signaling rather than a core molecular function. This is a valid regulatory connection but peripheral to SOX2's primary role as a transcriptional regulator of pluripotency and neural fate. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0070848 response to growth factor | IDA PMID:18187129 Forced expression of Sox2 or Nanog in human bone marrow deri... | KEEP AS NON CORE | Summary: IDA evidence for SOX2 response to growth factor stimulation. Reason: This represents an upstream regulatory input rather than SOX2's core function. Growth factors can regulate SOX2 expression or activity, but this does not define what SOX2 itself does. This is valid annotation but describes regulation of SOX2 rather than SOX2's function. Supporting Evidence: PMID:18187129 Epub 2007 Dec 4. Forced expression of Sox2 or Nanog in human bone marrow derived mesenchymal stem cells maintains their expansion and differentiation capabilities. |
| GO:0009611 response to wounding | IEP PMID:17982423 Stem cell markers in the human posterior limbus and corneal ... | KEEP AS NON CORE | Summary: Expression pattern evidence in corneal stem cells after wounding. Reason: IEP evidence showing SOX2 expression in corneal stem cells during wound healing. This represents SOX2's role in maintaining stem cell populations in a regenerative context, which is consistent with core function but wound response itself is a specific physiological context rather than core cellular function. Supporting Evidence: PMID:17982423 Stem cell markers in the human posterior limbus and corneal endothelium of unwounded and wounded corneas. |
| GO:0006325 chromatin organization | NAS PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2... | ACCEPT | Summary: NAS evidence for chromatin organization, likely based on SOX2's ability to bend DNA and engage nucleosomes. Reason: This annotation accurately captures SOX2's pioneer factor function. Deep research shows SOX2 engages nucleosomal DNA, bends DNA, and maintains chromatin accessibility at key regulatory sites. This is integral to SOX2's mechanism of action as a pioneer transcription factor and represents a core molecular activity. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md SOX2 can bind nucleosomal DNA in a position- and sequence-dependent manner and maintain chromatin accessibility at key regulatory sites file:genes/human/SOX2/SOX2-deep-research-falcon.md thousands of ATAC-seq peaks are lost within ~1 hour of SOX2 degradation PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2 gene. |
| GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific | IBA GO_REF:0000033 | ACCEPT | Summary: SOX2 functions as a sequence-specific transcriptional activator binding to Sox motifs (WWCAAW consensus). Reason: This annotation accurately represents SOX2's core molecular function. The HMG-box domain binds sequence-specifically to Sox motifs and activates transcription. This is supported by IBA phylogenetic inference and extensive experimental evidence. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md SOX2 contains a ~79-aa HMG box that binds the minor groove of cognate sequences (consensus WWCAAW; commonly the core TTGT) |
| GO:0001228 DNA-binding transcription activator activity, RNA polymerase II-specific | IEA GO_REF:0000107 | ACCEPT | Summary: Electronic annotation based on Ensembl ortholog data. Reason: Electronic annotation is consistent with experimental and phylogenetic evidence for transcriptional activator function. |
| GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific | ISA GO_REF:0000113 | ACCEPT | Summary: ISA evidence from TFClass database classification of SOX2 as a sequence-specific DNA-binding transcription factor. Reason: This is a parent term of DNA-binding transcription activator activity and accurately describes SOX2's molecular function class. The ISA evidence from TFClass is appropriate for classifying SOX2 within the transcription factor family. |
| GO:0003700 DNA-binding transcription factor activity | IDA PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveo... | ACCEPT | Summary: IDA evidence for general transcription factor activity. Reason: This is a high-level parent term accurately describing SOX2's molecular function. Multiple IDA studies support this classification. Supporting Evidence: PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveolar mucin in mucinous cancers of the colorectum and related lesions. |
| GO:0003700 DNA-binding transcription factor activity | IDA PMID:16153702 Core transcriptional regulatory circuitry in human embryonic... | ACCEPT | Summary: Additional IDA evidence for transcription factor activity. Reason: Independent experimental support for transcription factor classification. Supporting Evidence: PMID:16153702 Core transcriptional regulatory circuitry in human embryonic stem cells. |
| GO:0003700 DNA-binding transcription factor activity | NAS PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2... | ACCEPT | Summary: NAS evidence from original SOX2 characterization. Reason: Historical NAS annotation from the original SOX2 cloning and characterization is appropriate. Supporting Evidence: PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2 gene. |
| GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding | IBA GO_REF:0000033 | ACCEPT | Summary: SOX2 binds to cis-regulatory enhancer regions through sequence-specific recognition of Sox motifs. Reason: This annotation accurately captures SOX2's binding to enhancer elements. Deep research shows SOX2 binds thousands of enhancers and recognizes specific DNA sequences. This represents a core molecular function of the HMG-box domain. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md SOX2 and OCT4 co-occupy thousands of OSN (OCT4/SOX2/NANOG) enhancers in pluripotent cells |
| GO:0000976 transcription cis-regulatory region binding | IEA GO_REF:0000107 | ACCEPT | Summary: Electronic annotation for cis-regulatory region binding. Reason: This is a parent term of sequence-specific cis-regulatory binding and is supported by extensive evidence of SOX2 binding to enhancers. |
| GO:0000976 transcription cis-regulatory region binding | IDA PMID:18407919 Novel mutations in LHX3 are associated with hypopituitarism ... | ACCEPT | Summary: IDA evidence for cis-regulatory binding. Reason: Direct experimental evidence supports SOX2's binding to regulatory regions. Supporting Evidence: PMID:18407919 Apr 10. Novel mutations in LHX3 are associated with hypopituitarism and sensorineural hearing loss. |
| GO:0043565 sequence-specific DNA binding | IDA PMID:20713518 Foxp1 coordinates cardiomyocyte proliferation through both c... | ACCEPT | Summary: IDA evidence for sequence-specific DNA binding. Reason: This annotation accurately describes the fundamental DNA-binding property of the SOX2 HMG-box domain, which recognizes specific Sox motif sequences. This is a core molecular function. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md HMG box that binds the minor groove of cognate sequences (consensus WWCAAW) PMID:20713518 Foxp1 coordinates cardiomyocyte proliferation through both cell-autonomous and nonautonomous mechanisms. |
| GO:0003677 DNA binding | IEA GO_REF:0000043 | ACCEPT | Summary: Electronic annotation based on UniProtKB keyword mapping. Reason: This high-level term is appropriate for describing SOX2's DNA-binding capacity. While very general, it is not incorrect and is supported by HMG-box domain annotation. |
| GO:0003677 DNA binding | IDA PMID:19427902 Purification of human transcription factors Nanog and Sox2, ... | ACCEPT | Summary: IDA evidence for DNA binding from biochemical study. Reason: Direct experimental evidence for DNA binding is appropriate. Supporting Evidence: PMID:19427902 2009 May 8. Purification of human transcription factors Nanog and Sox2, each in complex with Skp, an Escherichia coli periplasmic chaperone. |
| GO:0003677 DNA binding | IDA PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | ACCEPT | Summary: Additional IDA evidence for DNA binding. Reason: Multiple independent experimental confirmations of DNA-binding activity. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0003677 DNA binding | IDA PMID:18407919 Novel mutations in LHX3 are associated with hypopituitarism ... | ACCEPT | Summary: Further IDA evidence for DNA binding. Reason: Consistent experimental support for DNA-binding function. Supporting Evidence: PMID:18407919 Apr 10. Novel mutations in LHX3 are associated with hypopituitarism and sensorineural hearing loss. |
| GO:0003677 DNA binding | IDA PMID:16153702 Core transcriptional regulatory circuitry in human embryonic... | ACCEPT | Summary: IDA evidence from embryonic stem cell study. Reason: DNA binding is well-established core molecular function. Supporting Evidence: PMID:16153702 Core transcriptional regulatory circuitry in human embryonic stem cells. |
| GO:0003677 DNA binding | NAS PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2... | ACCEPT | Summary: NAS evidence from original SOX2 paper. Reason: Historical annotation appropriate for fundamental DNA-binding function. Supporting Evidence: PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2 gene. |
| GO:0005515 protein binding | IPI PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch fr... | REMOVE | Summary: IPI evidence for protein-protein interaction (OCT4). Reason: The term "protein binding" is uninformative and does not tell us about SOX2's actual function. While SOX2 does bind OCT4 and other proteins, a more specific term like GO:0046982 (protein heterodimerization activity) or annotation of the specific complex (OCT4-SOX2 complex) would be more informative. Per curation guidelines, we should avoid generic "protein binding" annotations in favor of more specific molecular function terms. Supporting Evidence: PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch from stem cell pluripotency to specifying a cardiac fate. |
| GO:0005515 protein binding | IPI PMID:23667531 The SOX2-interactome in brain cancer cells identifies the re... | REMOVE | Summary: IPI evidence for protein interaction (USP9X, MSI2). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:23667531 The SOX2-interactome in brain cancer cells identifies the requirement of MSI2 and USP9X for the growth of brain tumor cells. |
| GO:0005515 protein binding | IPI PMID:24048479 Deterministic direct reprogramming of somatic cells to pluri... | REMOVE | Summary: IPI evidence for protein interaction (MBD3). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:24048479 Deterministic direct reprogramming of somatic cells to pluripotency. |
| GO:0005515 protein binding | IPI PMID:24525231 The PRKCI and SOX2 oncogenes are coamplified and cooperate t... | REMOVE | Summary: IPI evidence for protein interaction (PRKCI). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:24525231 The PRKCI and SOX2 oncogenes are coamplified and cooperate to activate Hedgehog signaling in lung squamous cell carcinoma. |
| GO:0005515 protein binding | IPI PMID:25416956 A proteome-scale map of the human interactome network. | REMOVE | Summary: IPI evidence from interactome mapping (SUMO1). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:25416956 A proteome-scale map of the human interactome network. |
| GO:0005515 protein binding | IPI PMID:25702638 The L1TD1 protein interactome reveals the importance of post... | REMOVE | Summary: IPI evidence for protein interaction (L1TD1, OCT4). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:25702638 Epub 2015 Feb 19. The L1TD1 protein interactome reveals the importance of post-transcriptional regulation in human pluripotency. |
| GO:0005515 protein binding | IPI PMID:27334688 Oncogenic Sox2 regulates and cooperates with VRK1 in cell cy... | REMOVE | Summary: IPI evidence for protein interaction (VRK1). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:27334688 Oncogenic Sox2 regulates and cooperates with VRK1 in cell cycle progression and differentiation. |
| GO:0005515 protein binding | IPI PMID:31515488 Extensive disruption of protein interactions by genetic vari... | REMOVE | Summary: IPI evidence for protein interaction (SUMO1). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:31515488 Extensive disruption of protein interactions by genetic variants across the allele frequency spectrum in human populations. |
| GO:0005515 protein binding | IPI PMID:29358331 LSD1 demethylase and the methyl-binding protein PHF20L1 prev... | REMOVE | Summary: IPI evidence for protein interaction (PHF20L1). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:29358331 2018 Jan 22. LSD1 demethylase and the methyl-binding protein PHF20L1 prevent SET7 methyltransferase-dependent proteolysis of the stem-cell protein SOX2. |
| GO:0005515 protein binding | IPI PMID:30442713 Proteolysis of methylated SOX2 protein is regulated by L3MBT... | REMOVE | Summary: IPI evidence for protein interaction (L3MBTL3). Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:30442713 2018 Nov 15. Proteolysis of methylated SOX2 protein is regulated by L3MBTL3 and CRL4(DCAF5) ubiquitin ligase. |
| GO:0005515 protein binding | IPI PMID:18456656 The molecular mechanism governing the oncogenic potential of... | REMOVE | Summary: IPI evidence for protein interaction. Reason: Generic protein binding term is uninformative per curation guidelines. Supporting Evidence: PMID:18456656 2008 May 2. The molecular mechanism governing the oncogenic potential of SOX2 in breast cancer. |
| GO:0035198 miRNA binding | IDA PMID:18710938 Oct4/Sox2-regulated miR-302 targets cyclin D1 in human embry... | KEEP AS NON CORE | Summary: IDA evidence for SOX2 binding to miR-302. Reason: While experimentally validated, miRNA binding represents a non-canonical activity that is not part of SOX2's core transcription factor function. The primary function of SOX2 is sequence-specific DNA binding and transcriptional regulation. miRNA interaction may represent regulatory crosstalk but is peripheral to the core molecular function. Supporting Evidence: PMID:18710938 Aug 18. Oct4/Sox2-regulated miR-302 targets cyclin D1 in human embryonic stem cells. |
| GO:0005634 nucleus | IBA GO_REF:0000033 | ACCEPT | Summary: SOX2 is a nuclear transcription factor with NLS sequences directing nuclear localization. Reason: Nuclear localization is essential for SOX2 function as a transcription factor. This annotation accurately represents where SOX2 performs its core function. UniProt describes nuclear localization regulated by NLS/NES sequences, and deep research confirms SOX2 is "predominantly nuclear." Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md Subcellular localization: SOX2 is nuclear; its HMG region and flanking sequences include NLS/NES |
| GO:0005634 nucleus | IEA GO_REF:0000120 | ACCEPT | Summary: Electronic annotation based on sequence analysis and ortholog data. Reason: Electronic annotation is consistent with experimental evidence for nuclear localization. |
| GO:0005634 nucleus | IDA PMID:17291498 Sox-2 is expressed by glial and progenitor cells and Pax-6 i... | ACCEPT | Summary: Direct experimental evidence for nuclear localization. Reason: Multiple IDA studies confirm nuclear localization through microscopy or fractionation. Supporting Evidence: PMID:17291498 2006 Dec 20. Sox-2 is expressed by glial and progenitor cells and Pax-6 is expressed by neuroblasts in the human subventricular zone. |
| GO:0005634 nucleus | IDA PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveo... | ACCEPT | Summary: Additional IDA evidence for nuclear localization. Reason: Consistent experimental evidence across multiple studies. Supporting Evidence: PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveolar mucin in mucinous cancers of the colorectum and related lesions. |
| GO:0005634 nucleus | IDA PMID:18285410 SOX2 plays a critical role in the pituitary, forebrain, and ... | ACCEPT | Summary: Further IDA evidence for nuclear localization. Reason: Well-established nuclear localization. Supporting Evidence: PMID:18285410 Epub 2008 Feb 19. SOX2 plays a critical role in the pituitary, forebrain, and eye during human embryonic development. |
| GO:0005634 nucleus | IC PMID:16153702 Core transcriptional regulatory circuitry in human embryonic... | ACCEPT | Summary: Inferred from curator statement based on DNA binding activity. Reason: IC inference is appropriate - DNA-binding transcription factors must be nuclear to function. Supporting Evidence: PMID:16153702 Core transcriptional regulatory circuitry in human embryonic stem cells. |
| GO:0005634 nucleus | NAS PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2... | ACCEPT | Summary: NAS evidence from original SOX2 paper. Reason: Historical annotation appropriate for nuclear localization. Supporting Evidence: PMID:7849401 The cDNA sequence and chromosomal location of the human SOX2 gene. |
| GO:0005654 nucleoplasm | IDA GO_REF:0000052 | ACCEPT | Summary: IDA evidence based on immunofluorescence localization. Reason: Nucleoplasm is a more specific cellular component than nucleus, indicating SOX2 is soluble within the nuclear compartment rather than associated with nuclear envelope or other nuclear structures. This is appropriate for a transcription factor. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-1112609 | ACCEPT | Summary: TAS evidence from Reactome pathway annotation (multiple Reactome entries). Reason: Multiple Reactome pathway annotations place SOX2 in nucleoplasm, consistent with its function in transcriptional regulation. These TAS annotations are appropriate. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972948 | ACCEPT | Summary: TAS from Reactome (OCT4, SOX2, NANOG bind GSC promoter). Reason: Consistent with nucleoplasmic localization during transcriptional activity. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972949 | ACCEPT | Summary: TAS from Reactome (OCT4, SOX2, NANOG bind EOMES promoter). Reason: Multiple Reactome TAS annotations are consistent with nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972956 | ACCEPT | Summary: TAS from Reactome (STAT3 promoter binding). Reason: Consistent nucleoplasm localization across Reactome pathways. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972960 | ACCEPT | Summary: TAS from Reactome (FGF2 promoter binding). Reason: Multiple consistent Reactome annotations support nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972962 | ACCEPT | Summary: TAS from Reactome (TDGF1 promoter binding). Reason: Consistent Reactome pathway annotations. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972964 | ACCEPT | Summary: TAS from Reactome (FOXD3 promoter binding). Reason: Consistent with nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972965 | ACCEPT | Summary: TAS from Reactome (TSC22D1 promoter binding). Reason: Multiple Reactome TAS annotations are appropriate. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972966 | ACCEPT | Summary: TAS from Reactome (HHEX promoter binding). Reason: Consistent Reactome annotations. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972967 | ACCEPT | Summary: TAS from Reactome (EPHA1 promoter binding). Reason: Appropriate TAS annotation from Reactome. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972975 | ACCEPT | Summary: TAS from Reactome (SALL1 promoter binding). Reason: Consistent with nucleoplasm localization during transcriptional regulation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972977 | ACCEPT | Summary: TAS from Reactome (DKK1 promoter binding). Reason: Multiple consistent Reactome pathway annotations. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972978 | ACCEPT | Summary: TAS from Reactome (ZIC3 promoter binding). Reason: Appropriate Reactome TAS annotation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-2972979 | ACCEPT | Summary: TAS from Reactome (CDX2 promoter). Reason: Consistent with nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-452894 | ACCEPT | Summary: TAS from Reactome (Expression of SOX2). Reason: Appropriate Reactome annotation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-480204 | ACCEPT | Summary: TAS from Reactome (NANOG promoter binding). Reason: Consistent nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-480685 | ACCEPT | Summary: TAS from Reactome (SOX2 promoter autoregulation). Reason: Appropriate Reactome TAS annotation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-5626938 | ACCEPT | Summary: TAS from Reactome (Beta-catenin binds SOX proteins). Reason: Consistent with nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-6790036 | ACCEPT | Summary: TAS from Reactome (STAT3-upregulated nuclear proteins). Reason: Appropriate Reactome annotation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-6800120 | ACCEPT | Summary: TAS from Reactome (DPPA4 gene binding). Reason: Consistent nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-9732125 | ACCEPT | Summary: TAS from Reactome (MITF promoter binding). Reason: Appropriate Reactome TAS annotation. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-9833066 | ACCEPT | Summary: TAS from Reactome (ZEB2 gene binding). Reason: Consistent with nucleoplasm localization. |
| GO:0005654 nucleoplasm | TAS Reactome:R-HSA-9926523 | ACCEPT | Summary: TAS from Reactome (MITF-dependent SOX2 expression). Reason: Final Reactome TAS annotation, consistent with others. |
| GO:0016607 nuclear speck | IEA GO_REF:0000044 | ACCEPT | Summary: Electronic annotation suggesting SOX2 localizes to nuclear speckles. Reason: Nuclear speckles are subnuclear domains enriched in splicing factors and certain transcription factors. UniProt states SOX2 colocalizes in speckles with SOX6. While this is a more specialized localization than general nucleoplasm, it is consistent with SOX2's dynamic localization in active transcriptional regions. This annotation is appropriate. Supporting Evidence: UniProtKB:P48431 Colocalizes with SOX6 in speckles |
| GO:0000785 chromatin | ISA GO_REF:0000113 | ACCEPT | Summary: ISA evidence from TFClass database indicating SOX2 associates with chromatin. Reason: This annotation is highly appropriate for SOX2 as a pioneer factor. Deep research shows SOX2 engages nucleosomal DNA and maintains chromatin accessibility. Chromatin localization is essential for SOX2's function as a pioneer transcription factor that can bind DNA in chromatin context. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md As a pioneer factor, SOX2 can bind nucleosomal DNA in a position- and sequence-dependent manner |
| GO:0005667 transcription regulator complex | TAS PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch fr... | ACCEPT | Summary: TAS evidence for SOX2 participation in transcriptional regulatory complexes, particularly with OCT4. Reason: SOX2 forms complexes with OCT4 and other transcription factors to regulate gene expression. This is well-documented and represents an important aspect of SOX2 function - it does not act alone but cooperates with partner factors in multi-protein complexes. Supporting Evidence: file:genes/human/SOX2/SOX2-deep-research-falcon.md Structural biophysics and NMR show that SOX2's HMG domain binds nucleosomal DNA in a site- and sequence-dependent manner and forms synergistic complexes with full-length OCT4 PMID:19736317 Interplay of Oct4 with Sox2 and Sox17: a molecular switch from stem cell pluripotency to specifying a cardiac fate. |
| GO:0005737 cytoplasm | IEA GO_REF:0000044 | ACCEPT | Summary: Electronic annotation based on UniProtKB subcellular location vocabulary. Reason: While SOX2 is predominantly nuclear, UniProt documents cytoplasmic localization that is regulated by post-translational modifications. Acetylation at K75 promotes nuclear export leading to cytoplasmic localization and proteasomal degradation. This represents a regulatory mechanism for controlling SOX2 levels and activity. Supporting Evidence: UniProtKB:P48431 Acetylation contributes to its nuclear localization and deacetylation by HDAC3 induces a cytoplasmic delocalization file:genes/human/SOX2/SOX2-deep-research-falcon.md acetylation at K75 within the SOX2 NES, mediated by CBP/p300 and ACSS3/ACSS2, promotes nuclear export |
| GO:0005737 cytoplasm | IDA PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveo... | ACCEPT | Summary: IDA evidence showing cytoplasmic localization of SOX2. Reason: Direct experimental observation of cytoplasmic SOX2 is consistent with regulated nuclear-cytoplasmic shuttling. While not the primary site of function, cytoplasmic localization is physiologically relevant for regulation of SOX2 activity. Supporting Evidence: PMID:18027866 Aberrant expression of SOX2 upregulates MUC5AC gastric foveolar mucin in mucinous cancers of the colorectum and related lesions. |
| GO:0005829 cytosol | IDA PMID:18000303 Evidence for the presence of stem cell-like progenitor cells... | ACCEPT | Summary: IDA evidence for cytosolic localization. Reason: Cytosol is the aqueous component of cytoplasm. This annotation is consistent with cytoplasmic localization and represents SOX2 in the soluble cytoplasmic fraction, likely during nuclear-cytoplasmic transport or regulated export. Supporting Evidence: PMID:18000303 Evidence for the presence of stem cell-like progenitor cells in human adult pancreas. |
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