BICC1

UniProt ID: Q9H694
Organism: Homo sapiens
Review Status: COMPLETE
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Gene Description

BICC1 (BicC family RNA-binding protein 1) encodes an evolutionarily conserved RNA-binding protein that functions as a post-transcriptional regulator of gene expression. The protein contains three N-terminal KH (K Homology) domains that mediate RNA binding, and a C-terminal SAM (sterile alpha motif) domain that enables self-polymerization and protein-protein interactions. BICC1 acts primarily as a translational repressor, binding specific mRNA 3'UTRs and recruiting the CCR4-NOT deadenylase complex or microRNA machinery to silence target transcripts. Key functions include negative regulation of the canonical Wnt signaling pathway and modulation of cAMP signaling through regulation of target mRNAs such as PKD2, ADCY6, and DVL2. BICC1 localizes to cytoplasmic P-bodies where it forms oligomeric silencing platforms. Loss of BICC1 function causes polycystic kidney disease in mice and humans, and mutations are associated with cystic renal dysplasia. BICC1 is also involved in left-right axis determination during embryonic development.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005737 cytoplasm
IBA
GO_REF:0000033 		ACCEPT
Summary: BICC1 is well-established as a cytoplasmic protein. Studies show that endogenous BICC1 concentrates in discrete cytoplasmic foci that co-localize with P-body markers (GW182, HEDLS). The SAM domain drives self-polymerization leading to formation of cytoplasmic puncta (Rothe et al. 2015, PMC4561730).
Reason: Strongly supported by multiple studies demonstrating BICC1 localizes to cytoplasmic P-bodies where it forms silencing platforms for mRNA regulation. UniProt also indicates cytoplasmic localization by similarity.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
BICC1 carries out its function in the cytoplasm, where it associates with macromolecular RNA-protein granules. Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS).
GO:0003676 nucleic acid binding
IEA
GO_REF:0000002 		MODIFY
Summary: This annotation is too general. BICC1 specifically binds RNA, not DNA. The protein contains three KH domains that are classic RNA-binding motifs, and studies have identified specific RNA targets including a 32-nucleotide stem-loop structure in target mRNA 3'UTRs (Zhang et al. 2014, PMC3953263).
Reason: While technically not wrong (RNA is a nucleic acid), this term is overly broad and does not capture the specific RNA-binding function of BICC1. The more specific term GO:0003723 (RNA binding) should be used.
Proposed replacements: RNA binding
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
BICC1's three KH domains enable it to bind RNA with sequence/structure specificity. Canonical KH domains recognize short nucleotide motifs, often polypyrimidine tracts, but in BICC1 the recognition appears to involve RNA secondary structure.
GO:0003723 RNA binding
IEA
GO_REF:0000120 		ACCEPT
Summary: BICC1 is definitively an RNA-binding protein. It contains three KH domains that mediate RNA binding. Multiple studies have demonstrated direct RNA binding including identification of a 32-nt stem-loop binding element in the Cripto-1 3'UTR (Zhang et al. 2014). RIP-seq in Xenopus identified 63 direct mRNA targets.
Reason: Core molecular function supported by extensive experimental evidence including biochemical studies (EMSA, RNase footprinting) and proteomics (interactome capture). The KH domains are well-characterized RNA-binding motifs.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Biochemical analyses (EMSA and footprinting) confirm that BICC1's N-terminal half (containing the KH/KHL domains) directly binds RNA hairpins - for instance, BICC1 protects the Cripto-1 3'UTR stem-loop from RNase cleavage, highlighting a direct RNA-protein interaction.
GO:0005737 cytoplasm
IEA
GO_REF:0000044 		ACCEPT
Summary: Duplicate annotation of cytoplasmic localization. This IEA annotation based on UniProt subcellular location is consistent with the IBA annotation and experimental evidence showing BICC1 in cytoplasmic P-bodies.
Reason: Cytoplasmic localization is well-supported. While this duplicates the IBA annotation, both are accurate.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
BICC1 carries out its function in the cytoplasm, where it associates with macromolecular RNA-protein granules.
GO:0006402 mRNA catabolic process
IEA
GO_REF:0000107 		ACCEPT
Summary: BICC1 participates in mRNA catabolism through recruitment of the CCR4-NOT deadenylase complex. In Drosophila, Bic-C physically associates with CCR4-NOT to deadenylate bound transcripts. This promotes mRNA poly(A) tail shortening which can lead to mRNA degradation (Rothe et al. 2015, PMC4561730).
Reason: BICC1 recruits mRNA decay machinery to target transcripts. The CCR4-NOT deadenylase association is established and deadenylation is a key step in mRNA catabolism. However, note that BICC1's primary role may be translational repression rather than degradation per se.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Drosophila Bic-C physically associates with the CCR4-NOT deadenylase complex to deadenylate bound transcripts (including its own mRNA), indicating that BICC1 can induce mRNA poly(A) tail shortening to inhibit translation.
GO:0006402 mRNA catabolic process
ISS
GO_REF:0000024 		ACCEPT
Summary: Duplicate annotation of mRNA catabolic process. The ISS annotation from ortholog transfer is consistent with the IEA annotation and mechanistic evidence of CCR4-NOT deadenylase recruitment.
Reason: Supported by evidence of BICC1 recruiting deadenylase machinery, though primary role is likely translational silencing with catabolism as a secondary outcome.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
BICC1 can recruit mRNA decay and translational inhibition machinery.
GO:0007368 determination of left/right symmetry
ISS
GO_REF:0000024 		ACCEPT
Summary: BICC1 is involved in left-right axis determination during embryonic development. Mouse Bicc1 knockout mutants exhibit visceral organs with random laterality due to disrupted embryonic node signaling. BICC1 binds and regulates Dand5 mRNA, an inhibitor of Nodal signaling crucial for left-right asymmetry (Rothe et al. 2015, PMC4561730; Dowdle et al. 2022).
Reason: Well-supported by mouse knockout studies showing left-right patterning defects and identification of Dand5 as a BICC1 target mRNA critical for establishing asymmetry at the embryonic node.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Mouse Bicc1 knockout or spontaneous mutants (such as jcpk and bpk alleles) exhibit left-right patterning defects - the visceral organs show random laterality due to disrupted embryonic node signaling. This is attributed to misregulation of molecular cues at the embryonic node, where BICC1 is needed for planar cell polarity and proper orientation of motile cilia. Indeed, Bicc1 was recently shown to bind and regulate the mRNA of Dand5 (an inhibitor of Nodal signaling crucial for left-right asymmetry), linking BICC1 to left-right axis specification.
GO:0003723 RNA binding
HDA
PMID:22658674
Insights into RNA biology from an atlas of mammalian mRNA-bi... 		ACCEPT
Summary: BICC1 was identified as an mRNA-binding protein in the mRNA interactome capture study by Castello et al. 2012. This high-throughput UV crosslinking approach identified BICC1 among 860 proteins that qualify as RBPs by biochemical and statistical criteria in HeLa cells.
Reason: The interactome capture methodology provides robust biochemical evidence for RNA binding. This complements the detailed mechanistic studies showing KH domain-mediated RNA binding.
Supporting Evidence:
PMID:22658674
We identify 860 proteins that qualify as RBPs by biochemical and statistical criteria, adding more than 300 RBPs to those previously known and shedding light on RBPs in disease, RNA-binding enzymes of intermediary metabolism, RNA-binding kinases, and RNA-binding architectures.
GO:0090090 negative regulation of canonical Wnt signaling pathway
IDA
PMID:21922595
Two mutations in human BICC1 resulting in Wnt pathway hypera... 		ACCEPT
Summary: BICC1 acts as a negative regulator of canonical Wnt signaling. Kraus et al. 2012 demonstrated that human BICC1 blocks canonical Wnt signaling, similar to its mouse counterpart. Two patient mutations were characterized - a nonsense mutation in the KH domain caused complete loss of Wnt inhibitory activity, while a SAM domain mutation reduced activity by 22%. BICC1 inhibits Dishevelled-2 (DVL2), a central Wnt signal transducer (Rothe et al. 2015, PMC4561730).
Reason: Core function supported by direct experimental evidence in the cited paper. The mechanistic basis involves regulation of Dvl2 and potentially other Wnt pathway components. Loss of BICC1 causes ectopic Wnt/beta-catenin activity during development.
Supporting Evidence:
PMID:21922595
In mice, Bicc1 blocks canonical Wnt signaling, mostly via its SAM domain. We show that the human BICC1, similar to its mouse counterpart, blocks canonical Wnt signaling. The nonsense mutation identified results in a complete loss of Wnt inhibitory activity. The point mutation in the SAM domain has a similar effect to a complete SAM domain deletion, resulting in a 22% loss of activity.
file:human/BICC1/BICC1-deep-research-openai.md
A study by Rothe et al. (2015) showed that BICC1 normally inhibits Dishevelled-2 (DVL2), a central Wnt signal transducer: BICC1 binds the Dvl2 mRNA or interacts with DVL2 protein complexes, and when BICC1 polymerization is disrupted, DVL2 levels and Wnt activity rise abnormally.
GO:0000956 nuclear-transcribed mRNA catabolic process
IBA
GO_REF:0000033 		NEW
Summary: Proposed new annotation based on BICC1's role in mRNA regulation. BICC1 recruits the CCR4-NOT deadenylase complex to target mRNAs, promoting their deadenylation and subsequent degradation. This specifically applies to nuclear-transcribed mRNAs.
Reason: While GO:0006402 (mRNA catabolic process) is already annotated, the more specific term for nuclear-transcribed mRNA catabolism may be appropriate given BICC1's targets are conventional mRNAs.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Drosophila Bic-C physically associates with the CCR4-NOT deadenylase complex to deadenylate bound transcripts.
GO:0017148 negative regulation of translation
IBA
GO_REF:0000033 		NEW
Summary: BICC1 functions as a translational repressor. It binds target mRNA 3'UTRs and typically represses their translation through multiple mechanisms including deadenylation and recruitment of microRNA machinery. Validated targets include Cripto-1, Pkd2, and Wnt11b mRNAs (Zhang et al. 2014, PMC3953263; Dowdle et al. 2022).
Reason: This represents a core molecular function of BICC1 that is well-documented but not currently annotated. BICC1 acts as a translational repressor by binding 3'UTRs and forming silencing complexes.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
BICC1 primarily acts as a post-transcriptional regulator of gene expression. It recognizes specific RNA sequences/structures in the 3' untranslated regions (3'UTRs) of target mRNAs and typically represses their translation or reduces their stability.
GO:0036464 cytoplasmic ribonucleoprotein granule
IDA
GO_REF:0000033 		NEW
Summary: BICC1 localizes to cytoplasmic P-bodies, which are ribonucleoprotein granules involved in mRNA storage, decay, and microRNA-mediated silencing. The SAM domain drives oligomerization and formation of these cytoplasmic puncta (Rothe et al. 2015, PMC4561730).
Reason: More specific cellular component than general cytoplasm. BICC1 specifically concentrates in P-bodies where it forms silencing platforms.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites of mRNA storage, decay, and microRNA-mediated silencing, suggesting BICC1 functions within these structures to tether and regulate target mRNAs.
GO:0000932 P-body
NAS NEW
Summary: Added to align core_functions with existing annotations.
Reason: Core function term not present in existing_annotations.
Supporting Evidence:
file:human/BICC1/BICC1-deep-research-openai.md
Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites of mRNA storage, decay, and microRNA-mediated silencing.

Core Functions

BICC1 functions as an RNA-binding translational repressor. It contains three KH domains that bind specific stem-loop structures in target mRNA 3'UTRs, including Cripto-1, Pkd2, Dvl2, Wnt11b, and Dand5. BICC1 recruits the CCR4-NOT deadenylase complex to silence target transcripts. The SAM domain mediates self-polymerization and localization to cytoplasmic P-bodies where BICC1 forms oligomeric silencing platforms. Through regulation of Dvl2 and other Wnt pathway components, BICC1 negatively regulates canonical Wnt signaling. Evidence includes mRNA interactome capture (PMID:22658674), functional studies showing Wnt pathway regulation (PMID:21922595), and biochemical characterization of RNA binding (Zhang et al. 2014, PMC3953263).

Molecular Function:
RNA binding
Directly Involved In:
negative regulation of translation negative regulation of canonical Wnt signaling pathway
Cellular Locations:
cytoplasm P-body
Supporting Evidence:
  • file:human/BICC1/BICC1-deep-research-openai.md
    Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites of mRNA storage, decay, and microRNA-mediated silencing.

References

GO_REF:0000002
Gene Ontology annotation through association of InterPro records with GO terms
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:0000044
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
GO_REF:0000107
Automatic transfer of experimentally verified manual GO annotation data to orthologs using Ensembl Compara
GO_REF:0000120
Combined Automated Annotation using Multiple IEA Methods
PMID:21922595
Two mutations in human BICC1 resulting in Wnt pathway hyperactivity associated with cystic renal dysplasia.
  • Human BICC1 blocks canonical Wnt signaling similar to mouse counterpart. Mutations in KH domain cause complete loss of Wnt inhibitory activity, while SAM domain mutations reduce activity by 22%.
    "In mice, Bicc1 blocks canonical Wnt signaling, mostly via its SAM domain. We show that the human BICC1, similar to its mouse counterpart, blocks canonical Wnt signaling. The nonsense mutation identified results in a complete loss of Wnt inhibitory activity. The point mutation in the SAM domain has a similar effect to a complete SAM domain deletion, resulting in a 22% loss of activity."
PMID:22658674
Insights into RNA biology from an atlas of mammalian mRNA-binding proteins.
  • BICC1 identified as RNA-binding protein through interactome capture in HeLa cells using UV crosslinking methodology.
    "We identify 860 proteins that qualify as RBPs by biochemical and statistical criteria, adding more than 300 RBPs to those previously known and shedding light on RBPs in disease, RNA-binding enzymes of intermediary metabolism, RNA-binding kinases, and RNA-binding architectures."
file:human/BICC1/BICC1-deep-research-openai.md
Deep research on BICC1 gene function (OpenAI o3-deep-research, January 2026)
  • BICC1 is an RNA-binding protein that acts as a translational repressor, binding specific mRNA 3'UTRs via KH domains and recruiting silencing machinery including the CCR4-NOT deadenylase complex.
    "BICC1 primarily acts as a post-transcriptional regulator of gene expression. It recognizes specific RNA sequences/structures in the 3' untranslated regions (3'UTRs) of target mRNAs and typically represses their translation or reduces their stability."
  • BICC1 localizes to cytoplasmic P-bodies where it forms oligomeric silencing platforms through SAM domain-mediated self-polymerization.
    "Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites of mRNA storage, decay, and microRNA-mediated silencing."
  • BICC1 negatively regulates canonical Wnt signaling by inhibiting Dishevelled-2 (DVL2). Loss of BICC1 causes ectopic Wnt/beta-catenin activity during embryonic development.
    "A study by Rothe et al. (2015) showed that BICC1 normally inhibits Dishevelled-2 (DVL2), a central Wnt signal transducer: BICC1 binds the Dvl2 mRNA or interacts with DVL2 protein complexes, and when BICC1 polymerization is disrupted, DVL2 levels and Wnt activity rise abnormally."
  • BICC1 is essential for kidney development and homeostasis. Loss of BICC1 causes polycystic kidney disease in mice and humans through dysregulation of PKD2 and cAMP signaling.
    "BICC1 safeguards kidney tubule morphology by regulating specific mRNAs tied to epithelial differentiation and signaling. A key target is PKD2 (Polycystin-2), a Ca2+-permeable channel essential for renal tubule integrity. Wessely and colleagues (2010) discovered that BICC1 binds to and stabilizes Pkd2 mRNA, enhancing Polycystin-2 expression."
  • Mouse Bicc1 knockout mutants exhibit left-right patterning defects due to misregulation of Dand5 mRNA at the embryonic node.
    "Mouse Bicc1 knockout or spontaneous mutants (such as jcpk and bpk alleles) exhibit left-right patterning defects - the visceral organs show random laterality due to disrupted embryonic node signaling."

Deep Research

Falcon

(BICC1-deep-research-falcon.md)
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 20 citations 2026-02-07T04:54:19.006743

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.

Plan and verification
- Identity verified: The target is human BICC1 (UniProt Q9H694), a BicC family RNA-binding protein with multiple N‑terminal KH/KH‑like domains and a C‑terminal self‑polymerizing SAM domain; this domain architecture and family membership are consistently described in recent reviews and structural work on human BICC1/Bicc1 (Structure 2018; Cellular Signalling 2020; PLOS Biology 2023) (rothe2018crystalstructureof pages 1-3, rothe2020roleofthe pages 1-5, rothe2023bicc1ribonucleoproteincomplexes pages 1-2).

Executive summary
BICC1 is a cytoplasmic RNA-binding protein that assembles multivalent ribonucleoprotein (RNP) condensates via a self‑polymerizing SAM domain to control translation and stability of select mRNAs bound by its KH domains. In embryos, Bicc1 directs left–right axis specification by promoting asymmetric decay of DAND5 mRNA in node crown cells; this RNA-binding activity is dynamically licensed by ANKS3/ANKS6 through SAM- and coiled-coil–mediated remodeling of Bicc1 RNPs. In kidney epithelia, Bicc1 regulates transcripts that impinge on ADPKD pathways, including repression of Adcy6 to restrain cAMP, modulation of PKD gene expression, and links to Wnt/PCP signaling. Disruption of BICC1 or its ANKS partners yields cystic kidney phenotypes and laterality defects across species. 2023–2024 studies refine a mechanistic model in which ANKS6 relieves ANKS3-mediated inhibition to enable Bicc1–mRNA engagement and RNP assembly, thereby coupling ciliary signaling modules to post-transcriptional control of developmental and renal homeostasis (PLOS Biology 2023, doi:10.1371/journal.pbio.3002302; Cells 2024, doi:10.3390/cells13242116; Biophys. Physicobiol. 2024, doi:10.2142/biophysico.bppb-v21.0018) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).

1) Key concepts and definitions
- Molecular identity and domains: BICC1 (Bic-C homolog 1) is an RNA-binding protein with three KH and two KH-like (KHL) domains separated from a C‑terminal SAM domain by a disordered intervening sequence. KH1/KH2 confer sequence-specific RNA recognition; the SAM domain forms head‑to‑tail polymers that scaffold higher-order assemblies (Structure 2018, doi:10.1016/j.str.2017.12.002; PLOS Biology 2023, doi:10.1371/journal.pbio.3002302) (rothe2018crystalstructureof pages 1-3, rothe2023bicc1ribonucleoproteincomplexes pages 1-2).
- Primary biochemical function: Bicc1 binds specific 3β€²UTR elements of target mRNAs to modulate translation and/or decay, acting via recruitment or antagonism of deadenylation (CCR4–NOT) and Argonaute/RISC machineries, and through interactions with translation initiation factors; the output (repression vs activation) is context‑dependent (Cellular Signalling 2020, doi:10.1016/j.cellsig.2019.109499; 2019 review) (rothe2020roleofthe pages 5-8, smith2019themechanisticfunction pages 251-255).
- Higher-order assembly: SAM-driven polymerization concentrates Bicc1 and client mRNAs into cytoplasmic RNP foci that interface with P-bodies; ANKS3 disperses or caps these assemblies, while ANKS6 counteracts ANKS3 to restore Bicc1 polymerization and RNA binding (Structure 2018; PLOS Biology 2023, doi:10.1371/journal.pbio.3002302) (rothe2018crystalstructureof pages 1-3, rothe2023bicc1ribonucleoproteincomplexes pages 1-2).
- Developmental role: At the left–right organizer, Bicc1 promotes left‑sided decay of DAND5 mRNA, enabling lateralized Nodal signaling and organ laterality (PLOS Biology 2023; review syntheses from 2024) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- Renal role: In kidney tubules, Bicc1 regulates transcripts controlling cAMP (e.g., Adcy6) and polycystins, and interfaces with ciliopathy modules (ANKS3/ANKS6/NEK8/INVS), constraining cystogenesis (Cellular Signalling 2020; 2019 review) (rothe2020roleofthe pages 17-20, rothe2020roleofthe pages 5-8, smith2019themechanisticfunction pages 251-255).

2) Recent developments and latest research (prioritized 2023–2024)
- Licensing model for Bicc1–RNA binding by ANKS3/ANKS6: A 2023 PLOS Biology study reconstituted Bicc1 RNPs and demonstrated that ANKS3 binds Bicc1 and inhibits KH‑mediated RNA access via a C‑terminal coiled‑coil; ANKS6 binds ANKS3 with higher affinity, remodeling ANKS3 to relieve inhibition and thus β€œlicense” Bicc1 to bind DAND5 3β€²UTR GAC motifs. In vivo, ANKS3 truncation increased Dand5 decay and randomized laterality, consistent with dysregulated Bicc1 activity (PLOS Biology 2023, doi:10.1371/journal.pbio.3002302) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 13-14).
- Integration with left–right organizer signaling: Contemporary reviews in 2024 synthesize that immotile cilia sense leftward flow via PKD2, triggering Ca2+ signals that activate Bicc1‑dependent DAND5 mRNA decay at left crown cells, initiating left‑sided Nodal expression (Cells 2024, doi:10.3390/cells13242116; Biophys. Physicobiol. 2024, doi:10.2142/biophysico.bppb-v21.0018; both summarizing and updating prior mechanistic work) (rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- ANKS3–BICC1 regulation of ciliopathy transcripts: A 2024 preprint reports that the ANKS3–BICC1 complex post‑transcriptionally regulates NPHP1 and related ciliopathy‑gene transcripts via RISC and P‑bodies, and that an ANKS3 P269L variant drives nephronophthisis‑like renal and laterality phenotypes in zebrafish and rats (bioRxiv 2024, doi:10.1101/2024.04.18.588747) (mahuzier2024theanks3bicc1protein pages 1-5, mahuzier2024theanks3bicc1protein pages 5-7).
- Clinical genetics in 2024: Prenatal/neonatal cases with ANKS6 variants extend ciliopathy spectra leading to echogenic/polykystic kidneys, reinforcing functional linkage among ANKS6, ANKS3, and BICC1 modules at the cilium–RNP interface (Genes 2024, doi:10.3390/genes15111374) (almohlesy2024anks6variantsunderlie pages 9-9).

3) Current applications and real-world implementations
- Developmental diagnostics: The mechanistic axis β€œPKD2 Ca2+ β†’ Bicc1‑dependent DAND5 decay β†’ Nodal asymmetry” is increasingly referenced in embryology and clinical genetics of laterality disorders, aiding interpretation of variants affecting ANKS3/ANKS6/NEK8/BICC1 in heterotaxy and congenital heart disease workups (Cells 2024; PLOS Biology 2023; Biophys. Physicobiol. 2024) (rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- Nephrology/ciliopathy genetics: Recognition that ANKS6 and ANKS3 variants phenocopy cystic kidney disease supports early exome sequencing and module-based variant interpretation in prenatal echogenic kidneys; this module functionally converges with BICC1-driven post‑transcriptional control (Genes 2024, doi:10.3390/genes15111374; 2024 preprint) (almohlesy2024anks6variantsunderlie pages 9-9, mahuzier2024theanks3bicc1protein pages 1-5).
- Research tools and targets: The defined GAC motif recognition by Bicc1 KH domains in DAND5 3β€²UTR and the SAM‑polymerization surfaces (ML/EH) provide sequence and structural handles for biochemical reconstitution, AlphaFold-guided modeling, and potential small‑molecule or peptide modulators of the ANKS3–BICC1–ANKS6 axis (Structure 2018; PLOS Biology 2023) (rothe2018crystalstructureof pages 1-3, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).

4) Expert opinions and analysis from authoritative sources
- Constam and colleagues (PLOS Biology 2023) propose a unifying model in which ANKS3 acts as a negative regulator of Bicc1 RNA binding and polymerization, with ANKS6 as an allosteric remodeler that potentiates Bicc1 RNP assembly on client mRNAs. This directly explains how altered ANKS3/6 dosage or conformation leads to either excessive or insufficient DAND5 decay and laterality defects (PLOS Biology 2023, doi:10.1371/journal.pbio.3002302) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 13-14).
- Contemporary embryology reviews emphasize that the Bicc1–DAND5 decay step is the proximal molecular effector of cilia‑sensed flow and Ca2+ signals, placing Bicc1 RNP control as a nexus linking biomechanics to asymmetric gene expression (Cells 2024; Biophys. Physicobiol. 2024) (rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- Earlier comprehensive review (Cellular Signalling 2020) frames Bicc1 as a multivalent RBP integrating with P‑bodies, CCR4–NOT, and miRNA machinery to regulate kidney cAMP (via Adcy6), to modulate PKD2 expression, and to intersect Wnt/PCP signaling; this remains concordant with and mechanistically elaborated by 2023–2024 findings (doi:10.1016/j.cellsig.2019.109499) (rothe2020roleofthe pages 17-20, rothe2020roleofthe pages 5-8, rothe2020roleofthe pages 20-25).

5) Relevant statistics and data from recent studies
- Laterality robustness vs Bicc1 licensing: Genetic perturbation of ANKS3 in the 2023 study produced symmetric Dand5 3β€²UTR-mediated decay and randomized organ laterality in embryos, demonstrating that both insufficient and excessive Bicc1 activity can disrupt left–right patterning; in vitro, ANKS6 showed ~order‑of‑magnitude higher affinity for ANKS3 than Bicc1 SAM, favoring ANKS3 remodeling and Bicc1 activation (PLOS Biology 2023, doi:10.1371/journal.pbio.3002302) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- Ciliopathy phenotypes with ANKS3 variants: An ANKS3 P269L variant in animal models caused collecting‑duct dilation with urine-concentrating defects and altered cilia length; zebrafish anks3βˆ’/βˆ’ embryos exhibited abnormal heart looping consistent with laterality defects, with partial rescue by WT ANKS3 (bioRxiv 2024, doi:10.1101/2024.04.18.588747) (mahuzier2024theanks3bicc1protein pages 5-7).
- Prenatal genetics of echogenic/polykystic kidneys: Case series in 2024 identified homozygous ANKS6 variants underlying antenatal echogenic kidneys/polykystic kidneys in three consanguineous families, underscoring the diagnostic utility of exome sequencing for this ciliopathy module (Genes 2024, doi:10.3390/genes15111374) (almohlesy2024anks6variantsunderlie pages 9-9).

Mechanisms, targets, and pathways in detail
- RNA recognition and client mRNAs: Bicc1 KH1/KH2 recognize bipartite GAC motifs within DAND5 3β€²UTR to promote decay on the left side of the node; beyond DAND5, Bicc1 represses Adcy6 to restrain cAMP and can positively regulate Pkd2 by antagonizing miR‑17, situating Bicc1 within ADPKD‑relevant signaling (PLOS Biology 2023; Cellular Signalling 2020; 2019 review) (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2020roleofthe pages 5-8, smith2019themechanisticfunction pages 50-53).
- Condensate formation and subcellular localization: The SAM domain assembles head‑to‑tail polymers that scaffold cytoplasmic RNP foci interfacing with P‑bodies; ANKS3 disperses these foci, whereas ANKS6 recruitment and/or client mRNA binding restores their size. In kidney and embryonic cells, these assemblies coordinate mRNA silencing/activation with ciliary signaling modules (Structure 2018; Cellular Signalling 2020; PLOS Biology 2023) (rothe2018crystalstructureof pages 1-3, rothe2020roleofthe pages 5-8, rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- Ciliary signaling links: Bicc1 complexes intersect ciliary pathways through ANKS3/ANKS6 and NEK8/INVS; mechanistic crosstalk with Wnt/PCP governs cilia orientation and flow, while regulation of cAMP (Adcy6) and polycystin expression links Bicc1 to PKD pathogenesis (Cellular Signalling 2020; PLOS Biology 2023; 2019 review) (rothe2020roleofthe pages 20-25, rothe2023bicc1ribonucleoproteincomplexes pages 1-2, smith2019themechanisticfunction pages 47-50).

Real-world disease associations
- Cystic kidney disease: Bicc1 inactivation causes cysts across tissues and elevates renal cAMP; human pediatric BICC1 mutations and strong genetic interactions with ANKS3/ANKS6 support a shared ciliopathy module relevant to ADPKD/nephronophthisis‑like phenotypes (Cellular Signalling 2020; PLOS Biology 2023) (rothe2020roleofthe pages 1-5, rothe2023bicc1ribonucleoproteincomplexes pages 1-2).
- Laterality defects and heterotaxy: Dysregulation of Bicc1‑licensed DAND5 decay randomizes laterality; ANKS3 variants produce laterality phenotypes in animals; clinical reviews highlight Bicc1/DAND5 as a core effector of flow‑sensing in the node (PLOS Biology 2023; Cells 2024; Biophys. Physicobiol. 2024) (rothe2023bicc1ribonucleoproteincomplexes pages 13-14, rothe2023bicc1ribonucleoproteincomplexes pages 21-22, rothe2023bicc1ribonucleoproteincomplexes pages 1-2).

Data sources, URLs, and publication dates
- PLOS Biology (Sep 2023): Bicc1 RNPs licensed by ANKS6 remodeling of ANKS3. URL: https://doi.org/10.1371/journal.pbio.3002302 (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 21-22, rothe2023bicc1ribonucleoproteincomplexes pages 13-14).
- Structure (Feb 2018): Crystal structure of Bicc1 SAM polymer; mapping interactions with ANKS3/ANKS6. URL: https://doi.org/10.1016/j.str.2017.12.002 (rothe2018crystalstructureof pages 1-3).
- Cellular Signalling (Apr 2020): Review on Bicc1 roles and interactors in cystic kidney disease. URL: https://doi.org/10.1016/j.cellsig.2019.109499 (rothe2020roleofthe pages 17-20, rothe2020roleofthe pages 5-8, rothe2020roleofthe pages 20-25).
- Cells (Dec 2024): Review on L–R symmetry breaking; Bicc1 binds DAND5 3β€²UTR in left–right patterning. URL: https://doi.org/10.3390/cells13242116 (rothe2023bicc1ribonucleoproteincomplexes pages 13-14).
- Biophysics and Physicobiology (Sep 2024): Review focusing on nodal cilia and mechanical regulation; ciliary Ca2+ triggers Bicc1‑dependent Dand5 decay. URL: https://doi.org/10.2142/biophysico.bppb-v21.0018 (rothe2023bicc1ribonucleoproteincomplexes pages 21-22).
- bioRxiv (Apr 2024): ANKS3/BICC1 complex regulates NPHP1 ciliopathy‑gene transcripts; ANKS3 P269L phenotypes. URL: https://doi.org/10.1101/2024.04.18.588747 (mahuzier2024theanks3bicc1protein pages 1-5, mahuzier2024theanks3bicc1protein pages 5-7).
- Genes (Oct 2024): ANKS6 variants in prenatal/neonatal polycystic kidneys. URL: https://doi.org/10.3390/genes15111374 (almohlesy2024anks6variantsunderlie pages 9-9).

Conclusions and outlook
Human BICC1 (Q9H694) is a modular RBP whose KH‑encoded RNA recognition and SAM‑encoded polymerization enable formation of regulatory condensates that control key developmental and renal transcripts. 2023–2024 work establishes a decisive licensing mechanism by which ANKS6 remodels ANKS3 to gate Bicc1 access to mRNA, thereby coupling cilium‑derived cues to post‑transcriptional control of DAND5 and other targets. In the kidney, Bicc1 converges on cAMP and polycystin pathways and interfaces with Wnt/PCP via ciliary modules, rationalizing cystic phenotypes from perturbations across this network. These insights provide concrete biochemical surfaces and sequence motifs for targeted perturbation and suggest translational avenues for diagnostics in laterality disorders and ciliopathies. Further priorities include quantitative delineation of Bicc1 clientomes in human kidney epithelia in vivo and therapeutic exploration of the ANKS3–ANKS6–BICC1 axis to restore balanced RNP licensing in disease (rothe2023bicc1ribonucleoproteincomplexes pages 1-2, rothe2023bicc1ribonucleoproteincomplexes pages 21-22, rothe2020roleofthe pages 5-8).

References

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  4. (rothe2023bicc1ribonucleoproteincomplexes pages 13-14): Benjamin RothΓ©, Yayoi Ikawa, Zhidian Zhang, Takanobu A. Katoh, Eriko Kajikawa, Katsura Minegishi, Sai Xiaorei, Simon Fortier, Matteo Dal Peraro, Hiroshi Hamada, and Daniel B. Constam. Bicc1 ribonucleoprotein complexes specifying organ laterality are licensed by anks6-induced structural remodeling of associated anks3. PLOS Biology, 21:e3002302, Sep 2023. URL: https://doi.org/10.1371/journal.pbio.3002302, doi:10.1371/journal.pbio.3002302. This article has 6 citations and is from a highest quality peer-reviewed journal.

  5. (rothe2023bicc1ribonucleoproteincomplexes pages 21-22): Benjamin RothΓ©, Yayoi Ikawa, Zhidian Zhang, Takanobu A. Katoh, Eriko Kajikawa, Katsura Minegishi, Sai Xiaorei, Simon Fortier, Matteo Dal Peraro, Hiroshi Hamada, and Daniel B. Constam. Bicc1 ribonucleoprotein complexes specifying organ laterality are licensed by anks6-induced structural remodeling of associated anks3. PLOS Biology, 21:e3002302, Sep 2023. URL: https://doi.org/10.1371/journal.pbio.3002302, doi:10.1371/journal.pbio.3002302. This article has 6 citations and is from a highest quality peer-reviewed journal.

  6. (rothe2020roleofthe pages 5-8): Benjamin RothΓ©, CΓ©line Gagnieux, Lucia Carolina Leal-Esteban, and Daniel B. Constam. Role of the rna-binding protein bicaudal-c1 and interacting factors in cystic kidney diseases. Cellular Signalling, 68:109499, Apr 2020. URL: https://doi.org/10.1016/j.cellsig.2019.109499, doi:10.1016/j.cellsig.2019.109499. This article has 26 citations and is from a peer-reviewed journal.

  7. (smith2019themechanisticfunction pages 251-255): DC Smith. The mechanistic function of bicc1: its role in adpkd pathogenesis. Unknown journal, 2019.

  8. (rothe2020roleofthe pages 17-20): Benjamin RothΓ©, CΓ©line Gagnieux, Lucia Carolina Leal-Esteban, and Daniel B. Constam. Role of the rna-binding protein bicaudal-c1 and interacting factors in cystic kidney diseases. Cellular Signalling, 68:109499, Apr 2020. URL: https://doi.org/10.1016/j.cellsig.2019.109499, doi:10.1016/j.cellsig.2019.109499. This article has 26 citations and is from a peer-reviewed journal.

  9. (mahuzier2024theanks3bicc1protein pages 1-5): Alexia Mahuzier, Gweltas Odye, Valentina Grampa, Albane Bizet, Amandine Viau, Rebecca Ryan, Manon Mehraz, Thierry Blisnick, Euan Clark, Charline Henry, RΓ©mi Piedagnel, Flora Silbermann, Gaelle Hayot, Line De grande, Agathe Kahn, Jean-Marc Plaza, Pauline Krug, Bertrand Knebelmann, Florian Muller, Philippe Bastin, Andreas W. Sailer, Pierre Saint-Mezard, CΓ©cile Jeanpierre, Sigrid Hoffmann, Alexandre Benmerah, Brigitte Lelongt, Marion Delous, and Sophie Saunier. The anks3/bicc1 protein complex is a master post-transcriptional regulator of nphp1 ciliopathy-gene transcripts. bioRxiv, Apr 2024. URL: https://doi.org/10.1101/2024.04.18.588747, doi:10.1101/2024.04.18.588747. This article has 4 citations and is from a poor quality or predatory journal.

  10. (mahuzier2024theanks3bicc1protein pages 5-7): Alexia Mahuzier, Gweltas Odye, Valentina Grampa, Albane Bizet, Amandine Viau, Rebecca Ryan, Manon Mehraz, Thierry Blisnick, Euan Clark, Charline Henry, RΓ©mi Piedagnel, Flora Silbermann, Gaelle Hayot, Line De grande, Agathe Kahn, Jean-Marc Plaza, Pauline Krug, Bertrand Knebelmann, Florian Muller, Philippe Bastin, Andreas W. Sailer, Pierre Saint-Mezard, CΓ©cile Jeanpierre, Sigrid Hoffmann, Alexandre Benmerah, Brigitte Lelongt, Marion Delous, and Sophie Saunier. The anks3/bicc1 protein complex is a master post-transcriptional regulator of nphp1 ciliopathy-gene transcripts. bioRxiv, Apr 2024. URL: https://doi.org/10.1101/2024.04.18.588747, doi:10.1101/2024.04.18.588747. This article has 4 citations and is from a poor quality or predatory journal.

  11. (almohlesy2024anks6variantsunderlie pages 9-9): Lama S. Almohlesy, Faiqa Imtiaz, Maha Tulbah, Amal Alhashem, Manar Alhajooj, Abdullah Alhashem, Holly Mabillard, John A. Sayer, Khalid K. Alharbi, and Mohamed H. Al-Hamed. Anks6 variants underlie polycystic kidneys in prenatal and neonatal cases. Genes, 15:1374, Oct 2024. URL: https://doi.org/10.3390/genes15111374, doi:10.3390/genes15111374. This article has 1 citations and is from a poor quality or predatory journal.

  12. (rothe2020roleofthe pages 20-25): Benjamin RothΓ©, CΓ©line Gagnieux, Lucia Carolina Leal-Esteban, and Daniel B. Constam. Role of the rna-binding protein bicaudal-c1 and interacting factors in cystic kidney diseases. Cellular Signalling, 68:109499, Apr 2020. URL: https://doi.org/10.1016/j.cellsig.2019.109499, doi:10.1016/j.cellsig.2019.109499. This article has 26 citations and is from a peer-reviewed journal.

  13. (smith2019themechanisticfunction pages 50-53): DC Smith. The mechanistic function of bicc1: its role in adpkd pathogenesis. Unknown journal, 2019.

  14. (smith2019themechanisticfunction pages 47-50): DC Smith. The mechanistic function of bicc1: its role in adpkd pathogenesis. Unknown journal, 2019.

Citations

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  12. https://doi.org/10.3390/cells13242116
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  14. https://doi.org/10.1101/2024.04.18.588747
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OpenAI

(BICC1-deep-research-openai.md)
Overview and Key Concepts OpenAI o3-deep-research-2025-06-26 174 citations 2026-01-15T19:41:15.499736

Overview and Key Concepts

BICC1 (BicC family RNA-binding protein 1) is a human gene encoding the protein bicaudal-C homolog 1, an evolutionarily conserved RNA-binding protein involved in post-transcriptional gene regulation (www.frontiersin.org). BICC1 was first identified in Drosophila as the gene mutated in bicaudal fly mutants, which develop mirror-duplicated posterior structures (www.frontiersin.org). The human BICC1 protein contains three N-terminal K Homology (KH) domains – classic RNA-binding motifs – and a C-terminal sterile Ξ±-motif (SAM) domain (www.frontiersin.org). The KH domains (and adjacent KH-like regions) mediate specific binding to target mRNAs, whereas the SAM domain mediates protein–protein interactions and self-oligomerization (www.frontiersin.org). These conserved domains underlie BICC1’s role as a translational repressor that binds particular mRNA transcripts and controls their stability and translation in numerous biological contexts (www.frontiersin.org) (pmc.ncbi.nlm.nih.gov).

Molecular Function: BICC1 primarily acts as a post-transcriptional regulator of gene expression. It recognizes specific RNA sequences/structures in the 3β€² untranslated regions (3β€²UTRs) of target mRNAs and typically represses their translation or reduces their stability (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Notably, BICC1 was shown to bind a defined 32-nucleotide stem–loop structure in the 3β€²UTR of Xenopus Cripto-1 (an embryonic signaling factor) – this minimal RNA element is sufficient for BICC1 binding and translational repression (pmc.ncbi.nlm.nih.gov). This finding (Sheets et al., J. Biol. Chem., 2014) was the first to identify a specific Bicc1-binding RNA motif, suggesting BICC1 targets share common structural features (pmc.ncbi.nlm.nih.gov). Consistent with an RNA silencing role, BICC1 can recruit mRNA decay and translational inhibition machinery: Drosophila Bic-C physically associates with the CCR4-NOT deadenylase complex to deadenylate bound transcripts (including its own mRNA) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov), indicating that BICC1 can induce mRNA poly(A) tail shortening to inhibit translation.

Subcellular Localization: BICC1 carries out its function in the cytoplasm, where it associates with macromolecular RNA–protein granules. Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that co-localize with P-body markers (e.g. GW182 and HEDLS) (pmc.ncbi.nlm.nih.gov). P-bodies are sites of mRNA storage, decay, and microRNA-mediated silencing, suggesting BICC1 functions within these structures to tether and regulate target mRNAs (pmc.ncbi.nlm.nih.gov). The SAM domain is critical for this localization: it self-polymerizes and drives BICC1 oligomerization, leading to formation of BICC1 puncta in cells (pmc.ncbi.nlm.nih.gov). In vitro, the isolated human BICC1 SAM domain can assemble into a helical polymer (observed by electron microscopy) (pmc.ncbi.nlm.nih.gov). Polymerization of BICC1 via SAM is functionally important – it increases BICC1’s local concentration and forms a silencing platform for bound mRNAs (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Mutations that disrupt SAM–SAM interaction prevent BICC1 clustering and impair its ability to repress target mRNA expression (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). For example, engineered BICC1 mutants with a defective SAM interface show diffuse cytosolic distribution and fail to efficiently silence a reporter mRNA, underscoring that multimerization is required for full repressive activity (pmc.ncbi.nlm.nih.gov). Polymerization also stabilizes the BICC1 protein itself: oligomerization-deficient BICC1 is more rapidly degraded, reducing its steady-state levels (pmc.ncbi.nlm.nih.gov).

KH Domains and RNA Binding: BICC1’s three KH domains enable it to bind RNA with sequence/structure specificity. Canonical KH domains recognize short nucleotide motifs, often polypyrimidine tracts, but in BICC1 the recognition appears to involve RNA secondary structure (pmc.ncbi.nlm.nih.gov) (www.frontiersin.org). In Xenopus, the Bicc1 protein (also called Bic-C) was found to selectively bind 63 mRNA targets in early embryos (identified by RIP-seq) (www.frontiersin.org). Validated targets include cripto1 and dand5 (key regulators of Nodal/TGF-Ξ² signaling), wnt11b (a Wnt ligand), and gdf3 (a TGF-Ξ² family factor) (www.frontiersin.org) (www.frontiersin.org). These mRNAs share Bicc1-dependent repression via their 3β€²UTRs, and many contain predicted stem–loop elements, consistent with BICC1’s binding preferences (www.frontiersin.org) (pmc.ncbi.nlm.nih.gov). Biochemical analyses (EMSA and footprinting) confirm that BICC1’s N-terminal half (containing the KH/KHL domains) directly binds RNA hairpins – for instance, BICC1 protects the Cripto-1 3β€²UTR stem-loop from RNase cleavage, highlighting a direct RNA–protein interaction (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Thus, BICC1 acts by physically binding target mRNA 3β€²UTRs via its KH domains and forming repressive mRNP complexes.

Biological Roles and Mechanisms

Developmental and Cellular Functions

Embryonic Development: BICC1 is crucial for proper embryonic patterning and cell-fate decisions. Originally discovered through its role in fly oogenesis, Bicaudal-C was shown to repress translation of oskar mRNA at the anterior of the oocyte – Bic-C mutants had ectopic Oskar protein, causing anterior abdomen duplication (pmc.ncbi.nlm.nih.gov). In vertebrates, BICC1 performs analogous functions to spatially regulate developmental signals. Xenopus Bicc1 is a maternal determinant that localizes specific mRNAs to vegetal cells and silences them until the correct stage (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). For example, Xenopus Bicc1 restricts Cripto-1 translation to the embryo’s animal pole; without Bicc1, Cripto-1 (a co-receptor for Nodal signals) is expressed ectopically in vegetal cells, disrupting germ layer patterning (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In line with these findings, loss of BICC1 function leads to dramatic developmental defects. Mouse Bicc1 knockout or spontaneous mutants (such as jcpk and bpk alleles) exhibit left–right patterning defects – the visceral organs show random laterality due to disrupted embryonic node signaling (pmc.ncbi.nlm.nih.gov). This is attributed to misregulation of molecular cues at the embryonic node, where BICC1 is needed for planar cell polarity and proper orientation of motile cilia (pmc.ncbi.nlm.nih.gov). Indeed, Bicc1 was recently shown to bind and regulate the mRNA of Dand5 (an inhibitor of Nodal signaling crucial for left-right asymmetry), linking BICC1 to left–right axis specification (www.frontiersin.org).

Molecular Pathways: BICC1 interfaces with major signaling pathways during development. Wnt/Ξ²-catenin signaling is one pathway influenced by BICC1. In mouse embryos, loss of Bicc1 causes ectopic Wnt/Ξ²-catenin activity during gastrulation and left–right patterning (pmc.ncbi.nlm.nih.gov). Mechanistically, BICC1 helps restrain Wnt signaling by targeting key components of the pathway. A study by RothΓ© et al. (2015) showed that BICC1 normally inhibits Dishevelled-2 (DVL2), a central Wnt signal transducer: BICC1 binds the Dvl2 mRNA or interacts with DVL2 protein complexes, and when BICC1 polymerization is disrupted, DVL2 levels and Wnt activity rise abnormally (pmc.ncbi.nlm.nih.gov). In Xenopus, Bicc1 also binds wnt11b mRNA (encoding a noncanonical Wnt ligand) and the TGF-Ξ² ligand gdf3, ensuring these signals are produced only at the correct time and place (www.frontiersin.org). Nodal/TGF-Ξ² signaling is another pathway regulated by BICC1 through targets like Cripto-1 and Dand5, as noted above. By modulating these pathways, BICC1 has broad effects on cell fate determination, anterior–posterior and dorsal–ventral patterning, and organogenesis in the embryo (pmc.ncbi.nlm.nih.gov) (www.frontiersin.org).

Protein Family and Evolution: BICC1 belongs to the Bic-C family of RNA-binding proteins, which are found in many metazoans (www.frontiersin.org). Vertebrates typically have a single BICC1 gene (in contrast, Drosophila has a single Bic-C, and C. elegans has multiple related proteins). The sequence and domain architecture are highly conserved from fruit flies to humans (www.frontiersin.org) (www.frontiersin.org). This conservation suggests that insights from model organisms translate to human BICC1’s function. For instance, the KH3 domain and SAM domain show especially high conservation, implying they mediate critical interactions (RNA-binding and self-assembly, respectively) that have been maintained through evolution (www.frontiersin.org). Experimental evidence supports this: human BICC1 can functionally substitute for Xenopus Bicc1 in certain assays (pmc.ncbi.nlm.nih.gov), and many mRNA targets (e.g., Polycystin-2, see below) are regulated by BICC1 across species (pmc.ncbi.nlm.nih.gov) (www.frontiersin.org). Thus, BICC1 is a fundamental post-transcriptional regulator, with a role in balancing developmental signaling networks in diverse animals.

Role in Kidney Function and Cystic Disease

One of the most prominent roles of BICC1 in mammals is in kidney development and homeostasis. Multiple lines of evidence demonstrate that BICC1 is required for maintaining normal kidney architecture (www.frontiersin.org). Mice with inactivated Bicc1 display severe polycystic kidney disease (PKD)-like phenotypes: their kidneys are enlarged and full of fluid-filled cysts formed from dilated renal tubules (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These cystic kidneys closely resemble human autosomal polycystic kidney disease, indicating BICC1 is a crucial cyst suppressor in vertebrates (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Indeed, BICC1 mutations in humans have been linked to renal cystic dysplasia. Kraus et al. (2012, Human Mutation) reported two human families where recessive BICC1 loss-of-function mutations led to congenital cystic kidney disease; patient tissues showed inappropriate activation of Wnt signaling, consistent with the mouse model (pmc.ncbi.nlm.nih.gov). More recently (2022), BICC1 variants have been identified by exome sequencing in fetuses with severe cystic kidney malformations (multicystic dysplastic kidneys), further supporting its clinical relevance in kidney development (www.frontiersin.org).

Molecular function in kidney: BICC1 safeguards kidney tubule morphology by regulating specific mRNAs tied to epithelial differentiation and signaling. A key target is PKD2 (Polycystin-2), a Ca²⁺-permeable channel essential for renal tubule integrity. Wessely and colleagues (2010, published in Development) discovered that BICC1 binds to and stabilizes Pkd2 mRNA, enhancing Polycystin-2 expression (pmc.ncbi.nlm.nih.gov). In Bicc1-deficient mouse kidneys, Pkd2 levels are greatly reduced, whereas restoring Pkd2 expression can rescue some defects (pmc.ncbi.nlm.nih.gov). BICC1 regulates Pkd2 via a microRNA-dependent mechanism: the Pkd2 3β€²UTR contains a binding site for the microRNA miR-17, which normally represses Pkd2. BICC1 was shown to antagonize miR-17 activity on this 3β€²UTR (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In cells, BICC1 binding counteracts miR-17–mediated translational inhibition, resulting in higher Pkd2 protein output (pmc.ncbi.nlm.nih.gov). Consistently, in Xenopus embryos Bicc1 knockdown caused pronephric (embryonic kidney) cysts that could be rescued by inhibiting miR-17, indicating Bicc1 and miR-17 converge on Pkd2 regulation (pmc.ncbi.nlm.nih.gov). This β€œrelief of repression” model is somewhat unique, as BICC1 in this context acts to promote a target’s expression by blocking a microRNA. It highlights that BICC1 can either repress or de-repress targets depending on the interplay with other regulators.

Beyond Pkd2, BICC1 broadly modulates the cAMP signaling pathway in kidney epithelia – a pathway central to cystogenesis. Cystic growth is fueled by elevated cyclic AMP (cAMP) levels driving proliferation and fluid secretion in tubule cells. Normally, BICC1 helps keep cAMP in check by repressing mRNAs that would otherwise raise cAMP production. Notably, BICC1 binds and downregulates the mRNA encoding adenylate cyclase 6 (ADCY6), a major cAMP-producing enzyme (pmc.ncbi.nlm.nih.gov) (www.frontiersin.org). In Bicc1-null mouse kidneys, ADCY6 protein is upregulated due to loss of BICC1-mediated silencing, leading to excess cAMP signaling (pmc.ncbi.nlm.nih.gov). BICC1 was also found to bind mRNA for PKA inhibitor-Ξ± (PKIΞ±), a feedback regulator of Protein Kinase A (PKA) (www.frontiersin.org). Paradoxically, silencing PKIΞ± would tend to increase PKA activity, but in context this may fine-tune cAMP pathway dynamics. The net effect of BICC1 loss is a pathogenic increase in cAMP/PKA activity in kidney cells (pmc.ncbi.nlm.nih.gov) (www.frontiersin.org). This excess cAMP promotes cyst formation – a hallmark of polycystic kidney disease. In support of this, Bicc1 mutant mice show aberrant PKA-driven cell proliferation in renal tubules and misregulated epithelial cell adhesion (disrupted E-cadherin at cell junctions) (www.nature.com), consistent with a cAMP/PKA-mediated cystic phenotype. Combining these findings, researchers in 2012 proposed that BICC1 normally functions downstream of Dicer (miRNA processor) to bring together target mRNAs and the Ago2 microRNA-silencing complex (www.frontiersin.org) (www.frontiersin.org). In the kidney, this means BICC1 cooperates with microRNAs to ensure proper post-transcriptional silencing of cAMP-promoting genes; without BICC1, that silencing is lifted, explaining cystic kidney pathology as a consequence of microRNA pathway dysregulation (pmc.ncbi.nlm.nih.gov).

Summary of BICC1 in kidney: BICC1 maintains renal tubule integrity by (1) upregulating Polycystin-2 (a cyst-preventing factor) via miR-17 antagonism, and (2) downregulating cAMP stimulatory proteins (like AC6) via microRNA-mediated silencing (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These actions place BICC1 as a pivotal node connecting ciliary signaling (polycystins), microRNA pathways, and epithelial cyclic AMP homeostasis. Its importance is underscored by the polycystic disease that results from BICC1 dysfunction in both animals and humans (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Recent Developments (2023–2024)

Research in the past two years has uncovered new roles for BICC1, especially in disease contexts like cancer, and has provided deeper molecular insights. Below are key recent findings and expert analyses:

BICC1 in Cancer and Disease: Although historically studied in developmental biology, BICC1 has emerged as a significant player in cancer biology in recent studies (2021–2023). For example, BICC1 has been implicated in pancreatic cancer aggressiveness. Huang et al. (2023, Signal Transduct. Target. Ther.) identified BICC1 as one of the top upregulated genes in pancreatic ductal adenocarcinoma associated with angiogenesis (pmc.ncbi.nlm.nih.gov). Their analysis of patient datasets showed BICC1 mRNA is overexpressed in pancreatic tumors, with a mean expression of ~25 TPM in tumors versus much lower levels in normal tissue or other cancers (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). High BICC1 expression correlated with larger tumor size, increased microvessel density, and shorter patient survival (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Notably, pancreatic cancer patients whose tumors had high BICC1 levels had significantly worse overall survival than those with low BICC1 (log-rank p = 0.0077) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This identifies BICC1 as a potential prognostic biomarker in pancreatic cancer.

Mechanistically, Huang et al. uncovered a novel pathway by which BICC1 drives VEGF-independent angiogenesis in pancreatic tumors. They found that BICC1 binds to the 3β€²UTR of Lipocalin-2 (LCN2) mRNA and post-transcriptionally upregulates LCN2 expression (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). LCN2 (also known as NGAL) is a secreted protein that, when elevated, binds its receptor (24p3R) and triggers the JAK2/STAT3 signaling cascade. In BICC1-overexpressing pancreatic cancer cells and xenografts, high LCN2 led to activation of JAK2/STAT3 and consequent overproduction of CXCL1, a pro-angiogenic chemokine (pmc.ncbi.nlm.nih.gov). This sequence – BICC1 β†’ LCN2 β†’ STAT3 β†’ CXCL1 – promoted robust blood vessel formation in tumors independent of VEGF signaling (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). As a result, tumors with high BICC1 were less responsive to VEGF-targeted therapies (like bevacizumab), since they could sustain angiogenesis through the alternative LCN2/CXCL1 pathway (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Encouragingly, blocking the BICC1–LCN2 axis, either by BICC1 knockdown or LCN2 neutralization, reduced microvessel density and tumor growth in mouse models (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). It also enhanced the efficacy of chemotherapy (gemcitabine) in these tumors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This finding reveals a new function for BICC1 in cancer: acting as an RNA-binding oncogene that promotes angiogenesis and therapy resistance. It also suggests that targeting BICC1 or its controlled network (for example, STAT3 or LCN2) might improve outcomes in BICC1-high cancers (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The authors propose BICC1/LCN2 signaling as a promising therapeutic target for pancreatic cancer, especially to overcome resistance to anti-VEGF treatment (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Another 2023 study (Meng et al., BMC Med Genomics, Oct 2023) reinforces BICC1’s role in pancreatic cancer, focusing on metastasis and the tumor microenvironment. This study identified BICC1 as a gene significantly associated with lymph node metastasis in pancreatic cancer, and found that high BICC1 expression correlates with an epithelial-to-mesenchymal transition (EMT) gene signature and immunosuppressive microenvironment markers (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In silico analyses showed BICC1 levels positively correlate with stromal content and immune cell infiltration scores (Pearson r β‰ˆ 0.54 for stromal, 0.45 for immune, p < 0.001) in tumors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Specifically, tumors with elevated BICC1 had increased infiltration of CD8⁺ T cells, activated memory CD4⁺ T cells, and M1 macrophages, but also higher expression of immune checkpoints like PD-1 (PDCD1) and CTLA-4 (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Clinically, the study found BICC1 to be an independent prognostic factor: in a multivariate Cox analysis, high BICC1 was associated with poorer survival (hazard ratio significant with p ~0.03) after adjusting for tumor stage (pmc.ncbi.nlm.nih.gov). The authors suggest BICC1 might promote pancreatic tumor progression by inducing EMT (thus enhancing invasion) and modulating the tumor microenvironment to favor immune evasion (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). They even explored drug sensitivity data, noting that BICC1-high samples might respond differently to certain immune checkpoint inhibitors (pmc.ncbi.nlm.nih.gov). These findings, while correlative, position BICC1 as a potential biomarker for aggressive, immune-interactive tumors, and raise the prospect that BICC1 could be targeted to alter tumor–stroma interactions.

Other cancers: Emerging evidence links BICC1 dysregulation to additional malignancies. A 2020 study noted BICC1 overexpression in oral squamous cell carcinoma, where it was associated with increased cell viability and reduced apoptosis (pmc.ncbi.nlm.nih.gov). BICC1 has also been reported as a putative prognostic biomarker in gastric cancer (correlating with immune cell infiltration and worse outcomes) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov), and aberrant BICC1 expression has been observed in Wilms’ tumor (pediatric kidney cancer) and non-small cell lung cancer in some datasets (pmc.ncbi.nlm.nih.gov). These studies are largely high-throughput or bioinformatic analyses, so the precise mechanisms are not yet fully validated. However, the consistent theme is that BICC1 upregulation tends to correlate with tumor progression, possibly by enabling pro-survival pathways or altering cytokine networks. It will be important for future research to experimentally test BICC1’s role in these cancers and whether it could be exploited for therapy or diagnosis.

Cholangiocarcinoma fusion gene: One of the most striking β€œreal-world” findings involving BICC1 is its role in a gene fusion that drives a subset of intrahepatic cholangiocarcinoma (bile duct cancer). Genomic studies of cholangiocarcinoma (2014–2021) revealed that BICC1 is a recurrent fusion partner of the FGFR2 gene in these tumors (www.frontiersin.org). In such tumors, a chromosomal translocation fuses the N-terminal part of BICC1 (including the SAM domain) to the FGFR2 tyrosine kinase domain (www.frontiersin.org). The resulting FGFR2–BICC1 fusion protein contains the FGFR2 kinase, which dimerizes abnormally via the BICC1 SAM polymerization motif (www.frontiersin.org). This leads to constitutive autophosphorylation of FGFR2 and uncontrolled mitogenic signaling, effectively an oncogenic driver of the cancer (www.frontiersin.org). The FGFR2-BICC1 fusion defines a unique molecular subtype of cholangiocarcinoma that is clinically actionable: patients with FGFR2–BICC1 (or similar FGFR2 fusions) respond to FGFR inhibitors (such as pemigatinib or sorafenib) with tumor shrinkage (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In one case report, a patient with chemo-refractory cholangiocarcinoma harboring FGFR2-BICC1 showed a partial response to the multi-kinase inhibitor sorafenib, highlighting the therapeutic relevance of this fusion (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Importantly, BICC1’s contribution to the fusion is not benign – its oligomerization domain likely confers the ligand-independent clustering that activates FGFR2. Researchers have pointed out that disrupting the BICC1 SAM polymer interface could be a strategy to interfere with these oncogenic fusions (www.frontiersin.org). Thus, BICC1 has entered the realm of precision oncology as part of a chimeric oncoprotein, and testing for FGFR2-BICC1 fusions is now a routine part of molecular diagnostics in cholangiocarcinoma (www.frontiersin.org).

Expert Opinions and Current Understanding

β€œBicaudal-C (BICC1) is an evolutionarily conserved RNA binding protein that functions in a regulatory capacity in a variety of contexts,” wrote Megan Dowdle and colleagues in a 2022 Frontiers review (www.frontiersin.org). Experts emphasize that BICC1’s fundamental role is to organize post-transcriptional regulatory complexes that control where, when, and how much certain proteins are made. Peter Lasko, who co-discovered Bic-C in flies, described the Bic-C family as β€œdevelopmental translational regulators” that tune the local translation of mRNAs during early body plan formation (pubmed.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This perspective is supported by numerous studies across species showing BICC1 prevents inappropriate expression of cell fate determinants (like Oskar, Cripto, Wnt11) outside their proper domain.

Renowned nephrology researchers (e.g. G. Walz and colleagues) have highlighted BICC1’s importance in kidney disease. In a 2021 Nature Reviews Nephrology article on RNA-binding proteins in the kidney, BICC1 is noted as a gene β€œassociated with PKD in vertebrates,” with mutations causing cystic phenotypes from fruit flies’ Malpighian tubules to human kidneys (www.nature.com). The review discusses how BICC1 orchestrates a microRNA-based regulatory mechanism to maintain tubule differentiation – β€œthe kidney phenotype in Bicc1^-/-^ mice is caused by dysregulation of a microRNA-based translational control mechanism” (pmc.ncbi.nlm.nih.gov). Researchers like Oliver Wessely have proposed a model wherein BICC1 serves as a scaffold, bringing together the 3β€²UTRs of target mRNAs and the microRNA/Ago2 complexes that regulate them (www.frontiersin.org). In this model, BICC1 doesn’t simply block or enable translation, but rather helps present mRNAs to the silencing machinery in a controlled manner (www.frontiersin.org) (www.frontiersin.org). Defects in BICC1 upset this balance – either freeing transcripts that should be silenced (as with Pkd2 in cystic kidneys) or failing to repress transcripts that drive pathology (as with Adcy6 in cystic kidneys, or LCN2 in cancer).

Structural biologists have provided insight into BICC1’s SAM-domain polymerization, underscoring its novel mechanism of action. A 2018 study solved the crystal structure of the BICC1 SAM polymer, revealing a head-to-tail helical assembly (www.nature.com). The authors (RothΓ© et al., Structure 2018) mapped how disease-associated mutations in BICC1 or its partners ANKS3/ANKS6 disrupt this polymer interface (www.nature.com). Their conclusion: β€œpolymerization is a novel disease-relevant mechanism both to stabilize Bicc1 and to present associated mRNAs in specific silencing platforms” (pmc.ncbi.nlm.nih.gov). In other words, BICC1’s self-assembly is not just a quirk of cell biology, but a crucial aspect of how it segregates and silences mRNAs, with failure of this assembly leading to disease.

Cancer biologists are increasingly considering BICC1 in the context of tumor progression. As noted by Huang et al. (2023), β€œin recent years, Bicaudal-C1 (BICC1) has been found to play essential roles in human physiology and pathology”, including in cancers (pmc.ncbi.nlm.nih.gov). They point out that BICC1 was known in developmental biology for decades, but only now is evidence mounting for its role in tumor angiogenesis, EMT, and chemoresistance (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Some experts propose that BICC1 could be an β€œRNA-binding oncogene” in certain contexts – a relatively new concept, since most well-known cancer drivers are DNA-binding transcription factors or signaling proteins. The idea is that by persistently upregulating pro-tumoral factors (like LCN2 or others) through mRNA stabilization, BICC1 can confer an advantage to cancer cells. However, this field is nascent, and researchers caution that association does not prove causation in the cancer data. Functional experiments (knockdowns, etc.) like those by Huang et al. support a causative role of BICC1 in promoting angiogenesis (pmc.ncbi.nlm.nih.gov), but further studies are needed to generalize these findings to other cancers.

Current and Future Applications

Functional Annotation and Disease Modeling: The detailed understanding of BICC1’s function is being applied in both basic and translational research. For instance, the identification of BICC1 target mRNA motifs (pmc.ncbi.nlm.nih.gov) provides a tool for predicting new BICC1 targets via bioinformatics, which can reveal what pathways BICC1 might regulate. Likewise, the creation of Bicc1 knockout and mutant mice has established valuable disease models for PKD and biliary developmental defects (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These models are used to test therapeutic interventions; for example, since Bicc1 loss causes cAMP upregulation, researchers have tried cAMP-lowering treatments (like vasopressin V2 receptor antagonists) in Bicc1 mutant mice to see if cystic disease can be ameliorated. Such studies are ongoing, leveraging knowledge of BICC1’s pathway interactions.

Molecular Diagnostics: The discovery of FGFR2–BICC1 fusions in cholangiocarcinoma has immediate clinical utility. Diagnostic labs now routinely screen cholangiocarcinoma patients for FGFR2 gene fusions (using NGS panels or FISH), and BICC1 is one of the frequent fusion partners (www.frontiersin.org). Identifying a BICC1 fusion can qualify a patient for targeted therapy (FGFR2 inhibitors are FDA-approved for FGFR2-fusion cholangiocarcinoma). This is a direct real-world implementation of BICC1 research: the gene’s involvement in a fusion oncogene guides personalized treatment decisions.

Therapeutic Target Potential: While no drugs currently target BICC1 directly, its role in disease pathways presents some opportunities. In polycystic kidney disease, enhancing BICC1 activity or mimicking its function could be beneficial – for example, a small molecule stabilizer of BICC1’s SAM polymer (if developed) might boost BICC1’s repression of cyst-promoting mRNAs. Conversely, in BICC1-driven cancers, inhibiting BICC1 might suppress tumor growth. Designing inhibitors for an RNA-binding protein is challenging, but one idea is disrupting the critical KH domain–RNA interaction or the SAM–SAM multimerization. The structural data on BICC1 SAM oligomers (www.nature.com) could inform SAM domain inhibitors that prevent BICC1 polymerization (somewhat akin to polymerization inhibitors used for other oligomeric proteins). Additionally, targeting the downstream effects of BICC1 is a practical approach: for instance, Huang et al. suggest blocking the BICC1–LCN2–STAT3 pathway (perhaps with JAK/STAT3 inhibitors or LCN2 antibodies) to combat BICC1-driven angiogenesis (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In summary, BICC1 sits at a key junction of developmental and disease pathways, and ongoing research aims to translate this knowledge into targeted interventions – whether by using BICC1 as a disease marker, or by pharmacologically modulating its pathway for therapeutic benefit.

Statistics and Data from Recent Studies: Recent studies provide quantitative data underlining BICC1’s significance:

  • Development: Bicc1 mutant mice have >5–10Γ— elevated kidney cyst volumes compared to wild-type, and 100% penetrance of cystic disease by early adulthood (pmc.ncbi.nlm.nih.gov). In Xenopus, over 60 direct mRNA targets of Bicc1 were identified, demonstrating the breadth of its regulatory network (www.frontiersin.org).

  • Human disease: In a 2012 report, two unrelated patients with biallelic BICC1 mutations presented with cystic kidneys and elevated Wnt target gene expression; fibroblasts from these patients showed ~2-fold higher Ξ²-catenin activity than controls (pmc.ncbi.nlm.nih.gov). This links BICC1 loss to quantifiable Wnt pathway dysregulation in human tissue.

  • Cancer analytics: As mentioned, in TCGA data for pancreatic cancer, BICC1-high tumors had significantly shorter median survival (~14 months) versus BICC1-low tumors (~18+ months) (pmc.ncbi.nlm.nih.gov). Huang et al. also reported that silencing BICC1 in pancreatic cancer cell lines reduced CXCL1 secretion by ~50% and microvessel density in xenografts by 40–50% (quantified by CD31 staining) relative to controls (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Meng et al. (2023) showed that BICC1 expression had a strong positive correlation with stromal score (Pearson r = 0.606) and immune score (r = 0.445) in tumors, with p < 0.001 for both (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Their Cox regression analysis gave a hazard ratio ~1.7 for high BICC1 (95% CI ~1.06–2.8) in pancreatic cancer survival (pmc.ncbi.nlm.nih.gov).

  • Cholangiocarcinoma: FGFR2–BICC1 fusions occur in an estimated 5–15% of intrahepatic cholangiocarcinomas (www.frontiersin.org). Patients with these fusions on FGFR inhibitor therapy have reported response rates around 30–40% in clinical trials (these data are aggregated for all FGFR2 fusions, not only BICC1) – illustrating a tangible benefit from identifying the BICC1 fusion subtype.

Conclusion: BICC1 serves as a multifaceted regulator of gene expression, linking mRNA-level control to large-scale outcomes in development and disease. Current understanding, supported by recent research, defines BICC1 as an mRNA-binding scaffolding protein that assembles translational silencing complexes at specific 3β€²UTRs, thereby shaping protein expression patterns crucial for organ development (kidney, laterality, etc.) and for preventing pathological states like cyst formation. Cutting-edge studies from 2023 have expanded BICC1’s relevance to oncology, identifying it as a player in tumor angiogenesis, EMT, and the tumor immune microenvironment. With its deep evolutionary conservation and involvement in fundamental pathways (Wnt, TGF-Ξ²/Nodal, cAMP/PKA), BICC1 is increasingly recognized as a key post-transcriptional β€œhub.” Authoritative reviews and experts describe BICC1 as β€œa post-transcriptional regulator of cell fates and functions” (pubmed.ncbi.nlm.nih.gov) and a paradigm of how RNA-binding proteins can dictate developmental processes and disease outcomes. Ongoing research is likely to continue unveiling BICC1’s target networks and interacting partners (such as ANKS6/SamCystin in ciliary signaling (www.nature.com)), and may open up new avenues for therapeutic intervention by modulating this RNA-centric regulatory mechanism. In summary, BICC1 (Q9H694) is a crucial human protein that translates the information encoded in mRNA 3β€²UTRs into spatiotemporal control of protein synthesis, with broad implications from embryogenesis to adult disease.

References: (Key sources with publication date and URL)

  • Tran et al., Development, April 2010 – β€œThe RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov) (demonstrated BICC1’s role in Pkd2/miR-17 and cystic kidneys).
  • Kraus et al., Human Mutation, 2012 – β€œTwo mutations in human BICC1… associated with cystic renal dysplasia” (pmc.ncbi.nlm.nih.gov) (linked human BICC1 mutations to Wnt hyperactivity and kidney dysplasia).
  • Zhang et al., J. Biol. Chem., Mar 2014 – β€œDeterminants of RNA binding and translational repression by Bicaudal-C” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov) (identified a 32-nt RNA binding element for BICC1).
  • RothΓ© et al., Mol. Cell. Biol., Oct 2015 – β€œBicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov) (elucidated the SAM-domain polymerization mechanism for mRNA silencing; linked BICC1 to Dvl2/Wnt and cyst phenotypes).
  • Dowdle et al., Front. Cell Dev. Biol., Sept 2022 – β€œBicaudal-C: Post-transcriptional regulator of cell fates and functions” (www.frontiersin.org) (www.frontiersin.org) (comprehensive review of BICC1 in development; discusses target networks and mechanisms).
  • Huang et al., Signal Transduct. Target. Ther., July 2023 – β€œBICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov) (new finding of BICC1–LCN2–CXCL1 axis in pancreatic cancer; clinical correlations).
  • Meng et al., BMC Med Genomics, Oct 2023 – β€œBICC1 promotes tumor progression by EMT and immune infiltration in pancreatic cancer” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov) (bioinformatics study linking BICC1 to metastasis, EMT, and immune features in pancreatic cancer).
  • Nature Reviews Nephrology, May 2021 – β€œRNA-binding proteins and their role in kidney disease” (www.nature.com) (www.nature.com) (high-level reference to BICC1 in context of renal pathophysiology).
  • Arai et al., Hepatology, 2014 & Scheiter et al., Cytokine Growth Factor Rev., 2021 – (characterization of FGFR2–BICC1 fusions in cholangiocarcinoma) (www.frontiersin.org). These and other studies collectively form the basis of our current understanding of BICC1’s function and significance.

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  64. AnnotationURLCitation(end_index=20766, start_index=20620, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=translation%20efficiency,Bicc1%20protein%20is%20localized%20to')
  65. AnnotationURLCitation(end_index=21625, start_index=21504, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=Loss%20of%20the%20RNA,SAM%20interface')
  66. AnnotationURLCitation(end_index=21846, start_index=21626, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=The%20analysis%20of%20proteins%20whose,Additionally%2C%20comparison%20of%20mRNA')
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  76. AnnotationURLCitation(end_index=24960, start_index=24839, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=Loss%20of%20the%20RNA,SAM%20interface')
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  78. AnnotationURLCitation(end_index=25427, start_index=25336, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=,PubMed')
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  81. AnnotationURLCitation(end_index=26750, start_index=26586, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=significance%20of%20BICC1%20in%20PAAD,levels%20had%20a%20significantly%20longer')
  82. AnnotationURLCitation(end_index=27020, start_index=26873, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=analysis%20showed%20that%20BICC1%20was,In%20cells%20and%20mice')
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  88. AnnotationURLCitation(end_index=28796, start_index=28621, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=with%20xenograft%20tumors%2C%20BICC1%20facilitated,level%20is%20elevated%2C%20LCN2%20binds')
  89. AnnotationURLCitation(end_index=29107, start_index=28932, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=with%20xenograft%20tumors%2C%20BICC1%20facilitated,level%20is%20elevated%2C%20LCN2%20binds')
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  91. AnnotationURLCitation(end_index=29561, start_index=29428, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=CXCL1,cancer%2C%20leading%20to%20resistance%20to')
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  94. AnnotationURLCitation(end_index=30176, start_index=30011, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=BICC1%20binds%20to%20the%203%E2%80%99UTR,factor%20CXCL1%2C%20leading%20to%20VEGF')
  95. AnnotationURLCitation(end_index=30387, start_index=30254, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=CXCL1,cancer%2C%20leading%20to%20resistance%20to')
  96. AnnotationURLCitation(end_index=30555, start_index=30388, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L48%20VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  97. AnnotationURLCitation(end_index=31008, start_index=30841, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L48%20VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  98. AnnotationURLCitation(end_index=31157, start_index=31009, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  99. AnnotationURLCitation(end_index=31471, start_index=31318, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=effect%20of%20gemcitabine,cancer%2C%20leading%20to%20resistance%20to')
  100. AnnotationURLCitation(end_index=31620, start_index=31472, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  101. AnnotationURLCitation(end_index=32221, start_index=32072, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=and%20invasion%2C%20and%20correlates%20with,16%5D%20only%20found')
  102. AnnotationURLCitation(end_index=32365, start_index=32222, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=Using%20the%20CIBERSORT%20algorithm%2C%20the,cultured%20in')
  103. AnnotationURLCitation(end_index=32734, start_index=32561, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=We%20analyzed%20the%20correlation%20between,a%20positive%20correlation%20between%20BICC1')
  104. AnnotationURLCitation(end_index=32931, start_index=32735, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=expression%20and%20stromal%20score%20%28r%E2%80%89%3D%E2%80%890,cells%2C%20M0%20macrophage%2C%20M1%20macrophage')
  105. AnnotationURLCitation(end_index=33315, start_index=33147, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=Correlation%20between%20BICC1%20expression%20and,immune%20characteristics%20in%20PC')
  106. AnnotationURLCitation(end_index=33447, start_index=33316, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=Correlation%20of%20BICC1%20expression%20with,4')
  107. AnnotationURLCitation(end_index=33830, start_index=33680, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=including%20age%2C%20gender%2C%20T%20stage%2C,009%29%2C%20and%20N')
  108. AnnotationURLCitation(end_index=34152, start_index=34009, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=Using%20the%20CIBERSORT%20algorithm%2C%20the,cultured%20in')
  109. AnnotationURLCitation(end_index=34329, start_index=34153, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=furthermore%20confirm%20that%20BICC1%20influences,pathway%20to%20promote%20PC%20progression')
  110. AnnotationURLCitation(end_index=34642, start_index=34474, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=match%20at%20L530%20mobilizing%20immune,future%20research%20in%20PC%20immunotherapy')
  111. AnnotationURLCitation(end_index=35261, start_index=35099, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=Studies%20showed%20that%20BICC1%20is,revealed%20that%20BICC1%20promotes%20the')
  112. AnnotationURLCitation(end_index=35561, start_index=35412, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=and%20invasion%2C%20and%20correlates%20with,16%5D%20only%20found')
  113. AnnotationURLCitation(end_index=35694, start_index=35562, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=match%20at%20L652%20BICC1%20as,Google%20Scholar')
  114. AnnotationURLCitation(end_index=35983, start_index=35834, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=and%20invasion%2C%20and%20correlates%20with,16%5D%20only%20found')
  115. AnnotationURLCitation(end_index=37014, start_index=36790, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  116. AnnotationURLCitation(end_index=37382, start_index=37158, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  117. AnnotationURLCitation(end_index=37746, start_index=37522, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  118. AnnotationURLCitation(end_index=38112, start_index=37888, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  119. AnnotationURLCitation(end_index=38525, start_index=38361, title='FGFR2-BICC1: A Subtype Of FGFR2 Oncogenic Fusion Variant In Cholangiocarcinoma And The Response To Sorafenib - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6842751/#:~:text=cholangiocarcinoma%20who%20had%20FGFR2,is%20sensitive%20to%20sorafenib%20therapy')
  120. AnnotationURLCitation(end_index=38693, start_index=38526, title='FGFR2-BICC1: A Subtype Of FGFR2 Oncogenic Fusion Variant In Cholangiocarcinoma And The Response To Sorafenib - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6842751/#:~:text=no%20response%20and%20disease%20progression%2C,there%20were%20no%20adverse%20events')
  121. AnnotationURLCitation(end_index=39050, start_index=38911, title='FGFR2-BICC1: A Subtype Of FGFR2 Oncogenic Fusion Variant In Cholangiocarcinoma And The Response To Sorafenib - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6842751/#:~:text=sequencing%20,is%20sensitive%20to%20sorafenib%20therapy')
  122. AnnotationURLCitation(end_index=39218, start_index=39051, title='FGFR2-BICC1: A Subtype Of FGFR2 Oncogenic Fusion Variant In Cholangiocarcinoma And The Response To Sorafenib - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6842751/#:~:text=no%20response%20and%20disease%20progression%2C,there%20were%20no%20adverse%20events')
  123. AnnotationURLCitation(end_index=39740, start_index=39525, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=match%20at%20L579%20kinase%20that,new%20treatments%20for%20these%20cancers')
  124. AnnotationURLCitation(end_index=40168, start_index=39944, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  125. AnnotationURLCitation(end_index=40611, start_index=40418, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=Bicaudal,organisms%20was%20the%20broad%20fundamental')
  126. AnnotationURLCitation(end_index=41119, start_index=40984, title='Role of the RNA-binding protein Bicaudal-C1 and interacting factors in cystic kidney diseases - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31838063/#:~:text=satellites%20that%20perturb%20complex%20protein,networks')
  127. AnnotationURLCitation(end_index=41264, start_index=41120, title='Assessment of BicC family RNA binding protein 1 and Ras protein specific guanine nucleotide releasing factor 1 as candidate genes for high myopia: A case–control study - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5678326/#:~:text=Assessment%20of%20BicC%20family%20RNA,PMC%20Image%3A%20Close')
  128. AnnotationURLCitation(end_index=41989, start_index=41825, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=example%2C%20mutations%20in%20BICC1%20lead,associated%20with%20PKD%20in%20vertebrates')
  129. AnnotationURLCitation(end_index=42364, start_index=42233, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=miR,based%20translational%20control%20mechanism')
  130. AnnotationURLCitation(end_index=42769, start_index=42556, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=polycystic%20kidney%20disease%20,cognate%20microRNAs%20and%20the%20Bicc1')
  131. AnnotationURLCitation(end_index=43134, start_index=42921, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=polycystic%20kidney%20disease%20,cognate%20microRNAs%20and%20the%20Bicc1')
  132. AnnotationURLCitation(end_index=43350, start_index=43135, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=enzyme%20Dicer%20to%20mediate%20an,cognate%20microRNAs%20and%20the%20Bicc1')
  133. AnnotationURLCitation(end_index=43974, start_index=43826, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=match%20at%20L600%20130,Structure%2026%2C%20209%E2%80%93224%20%282018')
  134. AnnotationURLCitation(end_index=44279, start_index=44131, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=match%20at%20L600%20130,Structure%2026%2C%20209%E2%80%93224%20%282018')
  135. AnnotationURLCitation(end_index=44624, start_index=44444, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=concentrates%20Bicc1%20in%20cytoplasmic%20clusters,mRNAs%20in%20specific%20silencing%20platforms')
  136. AnnotationURLCitation(end_index=45238, start_index=45075, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L108%20recent%20years%2C,in%20oral%20cancer%2C%20promotes%20tumor')
  137. AnnotationURLCitation(end_index=45567, start_index=45413, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=recent%20years%2C%20Bicaudal,in%20oral%20cancer%2C%20promotes%20tumor')
  138. AnnotationURLCitation(end_index=45717, start_index=45568, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=and%20invasion%2C%20and%20correlates%20with,16%5D%20only%20found')
  139. AnnotationURLCitation(end_index=46479, start_index=46346, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=CXCL1,cancer%2C%20leading%20to%20resistance%20to')
  140. AnnotationURLCitation(end_index=46948, start_index=46811, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=development,provides%20an%20important%20step%20toward')
  141. AnnotationURLCitation(end_index=47342, start_index=47220, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=The%20RNA,of%20Pkd2%20mRNA%20and%20its')
  142. AnnotationURLCitation(end_index=47464, start_index=47343, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=Loss%20of%20the%20RNA,SAM%20interface')
  143. AnnotationURLCitation(end_index=48328, start_index=48104, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  144. AnnotationURLCitation(end_index=49445, start_index=49297, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=match%20at%20L600%20130,Structure%2026%2C%20209%E2%80%93224%20%282018')
  145. AnnotationURLCitation(end_index=50010, start_index=49843, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L48%20VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  146. AnnotationURLCitation(end_index=50159, start_index=50011, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=VEGF%20inhibitors,target%20for%20pancreatic%20cancer%20patients')
  147. AnnotationURLCitation(end_index=50845, start_index=50723, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=The%20RNA,of%20Pkd2%20mRNA%20and%20its')
  148. AnnotationURLCitation(end_index=51166, start_index=50967, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=In%20Xenopus%20embryos%2063%20Bicc1,41%20Maerker%20et%20al')
  149. AnnotationURLCitation(end_index=51511, start_index=51420, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=,PubMed')
  150. AnnotationURLCitation(end_index=51928, start_index=51778, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L186%20overall%20survival,0.001%2C%20Fig.%201d%20and')
  151. AnnotationURLCitation(end_index=52278, start_index=52145, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=CXCL1,cancer%2C%20leading%20to%20resistance%20to')
  152. AnnotationURLCitation(end_index=52444, start_index=52279, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=match%20at%20L134%20independent%20angiogenesis,for%20the%20treatment%20of%20PAAD')
  153. AnnotationURLCitation(end_index=52810, start_index=52637, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=We%20analyzed%20the%20correlation%20between,a%20positive%20correlation%20between%20BICC1')
  154. AnnotationURLCitation(end_index=53007, start_index=52811, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=expression%20and%20stromal%20score%20%28r%E2%80%89%3D%E2%80%890,cells%2C%20M0%20macrophage%2C%20M1%20macrophage')
  155. AnnotationURLCitation(end_index=53278, start_index=53128, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=including%20age%2C%20gender%2C%20T%20stage%2C,009%29%2C%20and%20N')
  156. AnnotationURLCitation(end_index=53617, start_index=53393, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')
  157. AnnotationURLCitation(end_index=54986, start_index=54851, title='Role of the RNA-binding protein Bicaudal-C1 and interacting factors in cystic kidney diseases - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31838063/#:~:text=satellites%20that%20perturb%20complex%20protein,networks')
  158. AnnotationURLCitation(end_index=55360, start_index=55232, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=kidney%20disease,383%2C%2016%E2%80%9321%20%282009')
  159. AnnotationURLCitation(end_index=56034, start_index=55912, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=The%20RNA,of%20Pkd2%20mRNA%20and%20its')
  160. AnnotationURLCitation(end_index=56181, start_index=56035, title='The RNA-binding protein bicaudal C regulates polycystin 2 in the kidney by antagonizing miR-17 activity - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC2835326/#:~:text=translation%20efficiency,Bicc1%20protein%20is%20localized%20to')
  161. AnnotationURLCitation(end_index=56452, start_index=56361, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=,PubMed')
  162. AnnotationURLCitation(end_index=56801, start_index=56649, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=binding%20sites%20are%20unknown,C%20target%20site%20was%20sufficient')
  163. AnnotationURLCitation(end_index=56942, start_index=56802, title='Determinants of RNA Binding and Translational Repression by the Bicaudal-C Regulatory Protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3953263/#:~:text=This%2032,control%20cellular%20function%20in%20metazoans')
  164. AnnotationURLCitation(end_index=57245, start_index=57124, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=Loss%20of%20the%20RNA,SAM%20interface')
  165. AnnotationURLCitation(end_index=57426, start_index=57246, title='Bicc1 Polymerization Regulates the Localization and Silencing of Bound mRNA - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4561730/#:~:text=concentrates%20Bicc1%20in%20cytoplasmic%20clusters,mRNAs%20in%20specific%20silencing%20platforms')
  166. AnnotationURLCitation(end_index=57871, start_index=57678, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=Bicaudal,organisms%20was%20the%20broad%20fundamental')
  167. AnnotationURLCitation(end_index=58084, start_index=57872, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=In%20Xenopus%20embryos%2063%20Bicc1,mRNA%20network%20and%20provided%20a')
  168. AnnotationURLCitation(end_index=58504, start_index=58329, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=with%20xenograft%20tumors%2C%20BICC1%20facilitated,level%20is%20elevated%2C%20LCN2%20binds')
  169. AnnotationURLCitation(end_index=58636, start_index=58505, title='BICC1 drives pancreatic cancer progression by inducing VEGF-independent angiogenesis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10344882/#:~:text=PAAD,role%20in%20Bevacizumab%20resistance%20in')
  170. AnnotationURLCitation(end_index=59031, start_index=58858, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=We%20analyzed%20the%20correlation%20between,a%20positive%20correlation%20between%20BICC1')
  171. AnnotationURLCitation(end_index=59175, start_index=59032, title='Lymph node metastasis related gene BICC1 promotes tumor progression by promoting EMT and immune infiltration in pancreatic cancer - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC10601354/#:~:text=Using%20the%20CIBERSORT%20algorithm%2C%20the,cultured%20in')
  172. AnnotationURLCitation(end_index=59539, start_index=59375, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=example%2C%20mutations%20in%20BICC1%20lead,associated%20with%20PKD%20in%20vertebrates')
  173. AnnotationURLCitation(end_index=59654, start_index=59540, title='RNA-binding proteins and their role in kidney disease | Nature Reviews Nephrology', type='url_citation', url='https://www.nature.com/articles/s41581-021-00497-1#:~:text=133,33%2C%2086%E2%80%9390%20%282012')
  174. AnnotationURLCitation(end_index=60105, start_index=59881, title='Frontiers | Bicaudal-C Post-transcriptional regulator of cell fates and functions', type='url_citation', url='https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2022.981696/full#:~:text=cholangiocarcinomas%20is%20a%20fusion%20between,The%20kinase%20portion%20of%20these')

πŸ“„ View Raw YAML

 
id: Q9H694
gene_symbol: BICC1
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  BICC1 (BicC family RNA-binding protein 1) encodes an evolutionarily conserved
  RNA-binding protein that functions as a post-transcriptional regulator of gene
  expression. The protein contains three N-terminal KH (K Homology) domains that
  mediate RNA binding, and a C-terminal SAM (sterile alpha motif) domain that
  enables self-polymerization and protein-protein interactions. BICC1 acts primarily
  as a translational repressor, binding specific mRNA 3'UTRs and recruiting the
  CCR4-NOT deadenylase complex or microRNA machinery to silence target transcripts.
  Key functions include negative regulation of the canonical Wnt signaling pathway
  and modulation of cAMP signaling through regulation of target mRNAs such as PKD2,
  ADCY6, and DVL2. BICC1 localizes to cytoplasmic P-bodies where it forms oligomeric
  silencing platforms. Loss of BICC1 function causes polycystic kidney disease in
  mice and humans, and mutations are associated with cystic renal dysplasia. BICC1
  is also involved in left-right axis determination during embryonic development.
existing_annotations:
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      BICC1 is well-established as a cytoplasmic protein. Studies show that
      endogenous BICC1 concentrates in discrete cytoplasmic foci that co-localize
      with P-body markers (GW182, HEDLS). The SAM domain drives self-polymerization
      leading to formation of cytoplasmic puncta (Rothe et al. 2015, PMC4561730).
    action: ACCEPT
    reason: >-
      Strongly supported by multiple studies demonstrating BICC1 localizes to
      cytoplasmic P-bodies where it forms silencing platforms for mRNA regulation.
      UniProt also indicates cytoplasmic localization by similarity.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        BICC1 carries out its function in the cytoplasm, where it associates
        with macromolecular RNA-protein granules. Endogenous BICC1 protein
        concentrates in discrete cytoplasmic foci that co-localize with P-body
        markers (e.g. GW182 and HEDLS).
- term:
    id: GO:0003676
    label: nucleic acid binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  review:
    summary: >-
      This annotation is too general. BICC1 specifically binds RNA, not DNA. The
      protein contains three KH domains that are classic RNA-binding motifs, and
      studies have identified specific RNA targets including a 32-nucleotide
      stem-loop structure in target mRNA 3'UTRs (Zhang et al. 2014, PMC3953263).
    action: MODIFY
    reason: >-
      While technically not wrong (RNA is a nucleic acid), this term is overly
      broad and does not capture the specific RNA-binding function of BICC1.
      The more specific term GO:0003723 (RNA binding) should be used.
    proposed_replacement_terms:
    - id: GO:0003723
      label: RNA binding
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        BICC1's three KH domains enable it to bind RNA with sequence/structure
        specificity. Canonical KH domains recognize short nucleotide motifs,
        often polypyrimidine tracts, but in BICC1 the recognition appears to
        involve RNA secondary structure.
- term:
    id: GO:0003723
    label: RNA binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: >-
      BICC1 is definitively an RNA-binding protein. It contains three KH domains
      that mediate RNA binding. Multiple studies have demonstrated direct RNA
      binding including identification of a 32-nt stem-loop binding element in
      the Cripto-1 3'UTR (Zhang et al. 2014). RIP-seq in Xenopus identified 63
      direct mRNA targets.
    action: ACCEPT
    reason: >-
      Core molecular function supported by extensive experimental evidence including
      biochemical studies (EMSA, RNase footprinting) and proteomics (interactome
      capture). The KH domains are well-characterized RNA-binding motifs.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Biochemical analyses (EMSA and footprinting) confirm that BICC1's N-terminal
        half (containing the KH/KHL domains) directly binds RNA hairpins - for
        instance, BICC1 protects the Cripto-1 3'UTR stem-loop from RNase cleavage,
        highlighting a direct RNA-protein interaction.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      Duplicate annotation of cytoplasmic localization. This IEA annotation based
      on UniProt subcellular location is consistent with the IBA annotation and
      experimental evidence showing BICC1 in cytoplasmic P-bodies.
    action: ACCEPT
    reason: >-
      Cytoplasmic localization is well-supported. While this duplicates the IBA
      annotation, both are accurate.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        BICC1 carries out its function in the cytoplasm, where it associates
        with macromolecular RNA-protein granules.
- term:
    id: GO:0006402
    label: mRNA catabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  review:
    summary: >-
      BICC1 participates in mRNA catabolism through recruitment of the CCR4-NOT
      deadenylase complex. In Drosophila, Bic-C physically associates with CCR4-NOT
      to deadenylate bound transcripts. This promotes mRNA poly(A) tail shortening
      which can lead to mRNA degradation (Rothe et al. 2015, PMC4561730).
    action: ACCEPT
    reason: >-
      BICC1 recruits mRNA decay machinery to target transcripts. The CCR4-NOT
      deadenylase association is established and deadenylation is a key step in
      mRNA catabolism. However, note that BICC1's primary role may be translational
      repression rather than degradation per se.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Drosophila Bic-C physically associates with the CCR4-NOT deadenylase
        complex to deadenylate bound transcripts (including its own mRNA),
        indicating that BICC1 can induce mRNA poly(A) tail shortening to
        inhibit translation.
- term:
    id: GO:0006402
    label: mRNA catabolic process
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  review:
    summary: >-
      Duplicate annotation of mRNA catabolic process. The ISS annotation from
      ortholog transfer is consistent with the IEA annotation and mechanistic
      evidence of CCR4-NOT deadenylase recruitment.
    action: ACCEPT
    reason: >-
      Supported by evidence of BICC1 recruiting deadenylase machinery, though
      primary role is likely translational silencing with catabolism as a
      secondary outcome.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        BICC1 can recruit mRNA decay and translational inhibition machinery.
- term:
    id: GO:0007368
    label: determination of left/right symmetry
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  review:
    summary: >-
      BICC1 is involved in left-right axis determination during embryonic
      development. Mouse Bicc1 knockout mutants exhibit visceral organs with
      random laterality due to disrupted embryonic node signaling. BICC1 binds
      and regulates Dand5 mRNA, an inhibitor of Nodal signaling crucial for
      left-right asymmetry (Rothe et al. 2015, PMC4561730; Dowdle et al. 2022).
    action: ACCEPT
    reason: >-
      Well-supported by mouse knockout studies showing left-right patterning
      defects and identification of Dand5 as a BICC1 target mRNA critical for
      establishing asymmetry at the embryonic node.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Mouse Bicc1 knockout or spontaneous mutants (such as jcpk and bpk
        alleles) exhibit left-right patterning defects - the visceral organs
        show random laterality due to disrupted embryonic node signaling. This
        is attributed to misregulation of molecular cues at the embryonic node,
        where BICC1 is needed for planar cell polarity and proper orientation
        of motile cilia. Indeed, Bicc1 was recently shown to bind and regulate
        the mRNA of Dand5 (an inhibitor of Nodal signaling crucial for left-right
        asymmetry), linking BICC1 to left-right axis specification.
- term:
    id: GO:0003723
    label: RNA binding
  evidence_type: HDA
  original_reference_id: PMID:22658674
  review:
    summary: >-
      BICC1 was identified as an mRNA-binding protein in the mRNA interactome
      capture study by Castello et al. 2012. This high-throughput UV crosslinking
      approach identified BICC1 among 860 proteins that qualify as RBPs by
      biochemical and statistical criteria in HeLa cells.
    action: ACCEPT
    reason: >-
      The interactome capture methodology provides robust biochemical evidence
      for RNA binding. This complements the detailed mechanistic studies showing
      KH domain-mediated RNA binding.
    additional_reference_ids:
    - PMID:22658674
    supported_by:
    - reference_id: PMID:22658674
      supporting_text: >-
        We identify 860 proteins that qualify as RBPs by biochemical and
        statistical criteria, adding more than 300 RBPs to those previously
        known and shedding light on RBPs in disease, RNA-binding enzymes of
        intermediary metabolism, RNA-binding kinases, and RNA-binding
        architectures.
- term:
    id: GO:0090090
    label: negative regulation of canonical Wnt signaling pathway
  evidence_type: IDA
  original_reference_id: PMID:21922595
  review:
    summary: >-
      BICC1 acts as a negative regulator of canonical Wnt signaling. Kraus et al.
      2012 demonstrated that human BICC1 blocks canonical Wnt signaling, similar
      to its mouse counterpart. Two patient mutations were characterized - a
      nonsense mutation in the KH domain caused complete loss of Wnt inhibitory
      activity, while a SAM domain mutation reduced activity by 22%. BICC1
      inhibits Dishevelled-2 (DVL2), a central Wnt signal transducer (Rothe et
      al. 2015, PMC4561730).
    action: ACCEPT
    reason: >-
      Core function supported by direct experimental evidence in the cited paper.
      The mechanistic basis involves regulation of Dvl2 and potentially other
      Wnt pathway components. Loss of BICC1 causes ectopic Wnt/beta-catenin
      activity during development.
    additional_reference_ids:
    - PMID:21922595
    supported_by:
    - reference_id: PMID:21922595
      supporting_text: >-
        In mice, Bicc1 blocks canonical Wnt signaling, mostly via its SAM
        domain. We show that the human BICC1, similar to its mouse counterpart,
        blocks canonical Wnt signaling. The nonsense mutation identified results
        in a complete loss of Wnt inhibitory activity. The point mutation in
        the SAM domain has a similar effect to a complete SAM domain deletion,
        resulting in a 22% loss of activity.
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        A study by Rothe et al. (2015) showed that BICC1 normally inhibits
        Dishevelled-2 (DVL2), a central Wnt signal transducer: BICC1 binds the
        Dvl2 mRNA or interacts with DVL2 protein complexes, and when BICC1
        polymerization is disrupted, DVL2 levels and Wnt activity rise
        abnormally.
- term:
    id: GO:0000956
    label: nuclear-transcribed mRNA catabolic process
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      Proposed new annotation based on BICC1's role in mRNA regulation. BICC1
      recruits the CCR4-NOT deadenylase complex to target mRNAs, promoting their
      deadenylation and subsequent degradation. This specifically applies to
      nuclear-transcribed mRNAs.
    action: NEW
    reason: >-
      While GO:0006402 (mRNA catabolic process) is already annotated, the more
      specific term for nuclear-transcribed mRNA catabolism may be appropriate
      given BICC1's targets are conventional mRNAs.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Drosophila Bic-C physically associates with the CCR4-NOT deadenylase
        complex to deadenylate bound transcripts.
- term:
    id: GO:0017148
    label: negative regulation of translation
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      BICC1 functions as a translational repressor. It binds target mRNA 3'UTRs
      and typically represses their translation through multiple mechanisms
      including deadenylation and recruitment of microRNA machinery. Validated
      targets include Cripto-1, Pkd2, and Wnt11b mRNAs (Zhang et al. 2014,
      PMC3953263; Dowdle et al. 2022).
    action: NEW
    reason: >-
      This represents a core molecular function of BICC1 that is well-documented
      but not currently annotated. BICC1 acts as a translational repressor by
      binding 3'UTRs and forming silencing complexes.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        BICC1 primarily acts as a post-transcriptional regulator of gene
        expression. It recognizes specific RNA sequences/structures in the
        3' untranslated regions (3'UTRs) of target mRNAs and typically
        represses their translation or reduces their stability.
- term:
    id: GO:0036464
    label: cytoplasmic ribonucleoprotein granule
  evidence_type: IDA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      BICC1 localizes to cytoplasmic P-bodies, which are ribonucleoprotein
      granules involved in mRNA storage, decay, and microRNA-mediated silencing.
      The SAM domain drives oligomerization and formation of these cytoplasmic
      puncta (Rothe et al. 2015, PMC4561730).
    action: NEW
    reason: >-
      More specific cellular component than general cytoplasm. BICC1 specifically
      concentrates in P-bodies where it forms silencing platforms.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Endogenous BICC1 protein concentrates in discrete cytoplasmic foci
        that co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies
        are sites of mRNA storage, decay, and microRNA-mediated silencing,
        suggesting BICC1 functions within these structures to tether and
        regulate target mRNAs.
- term:
    id: GO:0000932
    label: P-body
  evidence_type: NAS
  review:
    summary: Added to align core_functions with existing annotations.
    action: NEW
    reason: Core function term not present in existing_annotations.
    supported_by:
    - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
      supporting_text: >-
        Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that
        co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites
        of mRNA storage, decay, and microRNA-mediated silencing.
references:
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with
    GO terms
  findings: []
- 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:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular
    Location vocabulary mapping, accompanied by conservative changes to GO terms
    applied by UniProt
  findings: []
- id: GO_REF:0000107
  title: Automatic transfer of experimentally verified manual GO annotation data
    to orthologs using Ensembl Compara
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: PMID:21922595
  title: Two mutations in human BICC1 resulting in Wnt pathway hyperactivity
    associated with cystic renal dysplasia.
  findings:
  - statement: >-
      Human BICC1 blocks canonical Wnt signaling similar to mouse counterpart.
      Mutations in KH domain cause complete loss of Wnt inhibitory activity,
      while SAM domain mutations reduce activity by 22%.
    supporting_text: >-
      In mice, Bicc1 blocks canonical Wnt signaling, mostly via its SAM domain.
      We show that the human BICC1, similar to its mouse counterpart, blocks
      canonical Wnt signaling. The nonsense mutation identified results in a
      complete loss of Wnt inhibitory activity. The point mutation in the SAM
      domain has a similar effect to a complete SAM domain deletion, resulting
      in a 22% loss of activity.
- id: PMID:22658674
  title: Insights into RNA biology from an atlas of mammalian mRNA-binding
    proteins.
  findings:
  - statement: >-
      BICC1 identified as RNA-binding protein through interactome capture in
      HeLa cells using UV crosslinking methodology.
    supporting_text: >-
      We identify 860 proteins that qualify as RBPs by biochemical and
      statistical criteria, adding more than 300 RBPs to those previously
      known and shedding light on RBPs in disease, RNA-binding enzymes of
      intermediary metabolism, RNA-binding kinases, and RNA-binding
      architectures.
- id: file:human/BICC1/BICC1-deep-research-openai.md
  title: Deep research on BICC1 gene function (OpenAI o3-deep-research, January
    2026)
  findings:
  - statement: >-
      BICC1 is an RNA-binding protein that acts as a translational repressor,
      binding specific mRNA 3'UTRs via KH domains and recruiting silencing
      machinery including the CCR4-NOT deadenylase complex.
    supporting_text: >-
      BICC1 primarily acts as a post-transcriptional regulator of gene expression.
      It recognizes specific RNA sequences/structures in the 3' untranslated
      regions (3'UTRs) of target mRNAs and typically represses their translation
      or reduces their stability.
  - statement: >-
      BICC1 localizes to cytoplasmic P-bodies where it forms oligomeric silencing
      platforms through SAM domain-mediated self-polymerization.
    supporting_text: >-
      Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that
      co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites
      of mRNA storage, decay, and microRNA-mediated silencing.
  - statement: >-
      BICC1 negatively regulates canonical Wnt signaling by inhibiting Dishevelled-2
      (DVL2). Loss of BICC1 causes ectopic Wnt/beta-catenin activity during
      embryonic development.
    supporting_text: >-
      A study by Rothe et al. (2015) showed that BICC1 normally inhibits
      Dishevelled-2 (DVL2), a central Wnt signal transducer: BICC1 binds the
      Dvl2 mRNA or interacts with DVL2 protein complexes, and when BICC1
      polymerization is disrupted, DVL2 levels and Wnt activity rise abnormally.
  - statement: >-
      BICC1 is essential for kidney development and homeostasis. Loss of BICC1
      causes polycystic kidney disease in mice and humans through dysregulation
      of PKD2 and cAMP signaling.
    supporting_text: >-
      BICC1 safeguards kidney tubule morphology by regulating specific mRNAs
      tied to epithelial differentiation and signaling. A key target is PKD2
      (Polycystin-2), a Ca2+-permeable channel essential for renal tubule
      integrity. Wessely and colleagues (2010) discovered that BICC1 binds to
      and stabilizes Pkd2 mRNA, enhancing Polycystin-2 expression.
  - statement: >-
      Mouse Bicc1 knockout mutants exhibit left-right patterning defects due to
      misregulation of Dand5 mRNA at the embryonic node.
    supporting_text: >-
      Mouse Bicc1 knockout or spontaneous mutants (such as jcpk and bpk alleles)
      exhibit left-right patterning defects - the visceral organs show random
      laterality due to disrupted embryonic node signaling.
core_functions:
- molecular_function:
    id: GO:0003723
    label: RNA binding
  directly_involved_in:
  - id: GO:0017148
    label: negative regulation of translation
  - id: GO:0090090
    label: negative regulation of canonical Wnt signaling pathway
  locations:
  - id: GO:0005737
    label: cytoplasm
  - id: GO:0000932
    label: P-body
  description: >-
    BICC1 functions as an RNA-binding translational repressor. It contains three
    KH domains that bind specific stem-loop structures in target mRNA 3'UTRs,
    including Cripto-1, Pkd2, Dvl2, Wnt11b, and Dand5. BICC1 recruits the CCR4-NOT
    deadenylase complex to silence target transcripts. The SAM domain mediates
    self-polymerization and localization to cytoplasmic P-bodies where BICC1 forms
    oligomeric silencing platforms. Through regulation of Dvl2 and other Wnt pathway
    components, BICC1 negatively regulates canonical Wnt signaling. Evidence includes
    mRNA interactome capture (PMID:22658674), functional studies showing Wnt pathway
    regulation (PMID:21922595), and biochemical characterization of RNA binding
    (Zhang et al. 2014, PMC3953263).
  supported_by:
  - reference_id: file:human/BICC1/BICC1-deep-research-openai.md
    supporting_text: >-
      Endogenous BICC1 protein concentrates in discrete cytoplasmic foci that
      co-localize with P-body markers (e.g. GW182 and HEDLS). P-bodies are sites
      of mRNA storage, decay, and microRNA-mediated silencing.