Chaparral Labs
back to search

protein

Catenin beta-1

CTNNB1
protein:P35222ad:direction:downdisease:addisease:asdsfari:1sfari:syndromic

Gene

CTNNB1

Organism

Homo sapiens(9606)

Length

781 aa

Mass

85,497 Da

AI summarysource-grounded · cited inline
claude-haiku-4-5-20251001

Catenin beta-1 (CTNNB1) is a key downstream component of the canonical Wnt signaling pathway that functions as a transcriptional coactivator (UniProt: P35222). In the absence of Wnt ligands, CTNNB1 is phosphorylated and ubiquitinated by a complex including AXIN1, APC, and GSK3B, leading to proteasomal degradation. When Wnt signaling is active, CTNNB1 accumulates in the nucleus and acts as a coactivator for TCF/LEF transcription factors to activate Wnt-responsive genes. The protein also participates in cell adhesion, epithelial-mesenchymal transition, and neurogenesis.

CTNNB1 is involved in multiple cellular and developmental contexts, including centrosome regulation, insulin internalization, and chondrocyte and odontoblast differentiation. Disease associations include colorectal cancer, medulloblastoma, ovarian cancer, and pilomatrixoma, reflecting its role in cell proliferation and cancer pathways.

CTNNB1 carries SFARI classification tags indicating a curated association with autism spectrum disorder (SFARI Cat 1), specifically as a syndromic autism gene. Mutations in CTNNB1 have been linked to neurodevelopmental disorder with spastic diplegia and visual defects (NEDSDV), an autosomal dominant condition characterized by developmental delay, intellectual disability, microcephaly, and spasticity (UniProt: P35222).

Generated from the curated entity record below. May contain errors — verify against source links.

Proteomics Evidence · AD

↓ Down in AD

P3

not detected

P2

not detected

S2

-0.886

S3

not detected

Mean log₂FC across detected fractions: -0.8863 (1 of 4 fractions detected)

Human post-mortem AD brain vs age-matched controls, TMT-labeled, 4 subcellular fractions (P2, P3, S2, S3), DDA proteomics.

Genetic Evidence · ASD

SFARI 1Syndromic

High confidence — strong genetic evidence from multiple studies

Source: SFARI Gene database · gene.sfari.org

🔬

This protein is implicated in both ASD and Alzheimer's Disease. View all cross-disease proteins →

Related Publications

Browse all →

Function

Key downstream component of the canonical Wnt signaling pathway (PubMed:17524503, PubMed:18077326, PubMed:18086858, PubMed:18957423, PubMed:21262353, PubMed:22155184, PubMed:22647378, PubMed:22699938). In the absence of Wnt, forms a complex with AXIN1, AXIN2, APC, CSNK1A1 and GSK3B that promotes phosphorylation on N-terminal Ser and Thr residues and ubiquitination of CTNNB1 via BTRC and its subsequent degradation by the proteasome (PubMed:17524503, PubMed:18077326, PubMed:18086858, PubMed:18957423, PubMed:21262353, PubMed:22155184, PubMed:22647378, PubMed:22699938). In the presence of Wnt ligand, CTNNB1 is not ubiquitinated and accumulates in the nucleus, where it acts as a coactivator for transcription factors of the TCF/LEF family, leading to activate Wnt responsive genes (PubMed:17524503, PubMed:18077326, PubMed:18086858, PubMed:18957423, PubMed:21262353, PubMed:22155184, PubMed:22647378, PubMed:22699938). Also acts as a coactivator for other transcription factors, such as NR5A2 (PubMed:22187462). Promotes epithelial to mesenchymal transition/mesenchymal to epithelial transition (EMT/MET) via driving transcription of CTNNB1/TCF-target genes (PubMed:29910125). Involved in the regulation of cell adhesion, as component of an E-cadherin:catenin adhesion complex (By similarity). Acts as a negative regulator of centrosome cohesion (PubMed:18086858). Involved in the CDK2/PTPN6/CTNNB1/CEACAM1 pathway of insulin internalization (PubMed:21262353). Blocks anoikis of malignant kidney and intestinal epithelial cells and promotes their anchorage-independent growth by down-regulating DAPK2 (PubMed:18957423). Disrupts PML function and PML-NB formation by inhibiting RANBP2-mediated sumoylation of PML (PubMed:22155184). Promotes neurogenesis by maintaining sympathetic neuroblasts within the cell cycle (By similarity). Involved in chondrocyte differentiation via interaction with SOX9: SOX9-binding competes with the binding sites of TCF/LEF within CTNNB1, thereby inhibiting the Wnt signaling (By similarity). Acts as a positive regulator of odontoblast differentiation during mesenchymal tooth germ formation, via promoting the transcription of differentiation factors such as LEF1, BMP2 and BMP4 (By similarity). Activity is repressed in a MSX1-mediated manner at the bell stage of mesenchymal tooth germ formation which prevents premature differentiation of odontoblasts (By similarity)

Disease associations

  • Colorectal cancerCRC

    A complex disease characterized by malignant lesions arising from the inner wall of the large intestine (the colon) and the rectum. Genetic alterations are often associated with progression from premalignant lesion (adenoma) to invasive adenocarcinoma. Risk factors for cancer of the colon and rectum include colon polyps, long-standing ulcerative colitis, and genetic family history.

  • PilomatrixomaPTR

    Common benign skin tumor.

  • MedulloblastomaMDB

    Malignant, invasive embryonal tumor of the cerebellum with a preferential manifestation in children.

  • Ovarian cancerOC

    The term ovarian cancer defines malignancies originating from ovarian tissue. Although many histologic types of ovarian tumors have been described, epithelial ovarian carcinoma is the most common form. Ovarian cancers are often asymptomatic and the recognized signs and symptoms, even of late-stage disease, are vague. Consequently, most patients are diagnosed with advanced disease.

  • Mesothelioma, malignantMESOM

    An aggressive neoplasm of the serosal lining of the chest. It appears as broad sheets of cells, with some regions containing spindle-shaped, sarcoma-like cells and other regions showing adenomatous patterns. Pleural mesotheliomas have been linked to exposure to asbestos.

  • Neurodevelopmental disorder with spastic diplegia and visual defectsNEDSDV

    An autosomal dominant disorder characterized by global developmental delay, severe intellectual disability with absent or very limited speech, microcephaly, spasticity, and visual abnormalities.

  • Vitreoretinopathy, exudative 7EVR7

    An autosomal dominant form of exudative vitreoretinopathy, a disorder of the retinal vasculature characterized by an abrupt cessation of growth of peripheral capillaries, leading to an avascular peripheral retina. This may lead to compensatory retinal neovascularization, which is thought to be induced by hypoxia from the initial avascular insult. New vessels are prone to leakage and rupture causing exudates and bleeding, followed by scarring, retinal detachment and blindness. Clinical features can be highly variable, even within the same family. Patients with mild forms of the disease are asymptomatic, and their only disease related abnormality is an arc of avascular retina in the extreme temporal periphery.

Sources

Last updated 5/8/2026, 1:05:00 AM