CNTN3
Chr 3contactin 3
Also known as: BIG-1, PANG, PCS
The protein mediates cell surface interactions during nervous system development and promotes neurite outgrowth as a cell adhesion molecule located in the extracellular region and plasma membrane. Mutations cause autosomal recessive developmental and epileptic encephalopathy with cortical blindness, intellectual disability, and seizures typically beginning in infancy. The gene shows low constraint against loss-of-function variants.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
More LoF-intolerant than ~75% of genes
Mild missense constraint
This gene has evidence for multiple mechanisms of pathogenicity (dominant-negative and gain-of-function). Both the Badonyi & Marsh prediction and the broader genomic evidence point to dominant-negative as the predominant mechanism. Different variants in this gene may act through different mechanisms — interpret in context of the specific variant.
Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.
ClinVar Variant Classifications
191 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 0 | 0 | 10 | 0 | 10 |
Likely Pathogenic | 0 | 0 | 2 | 0 | 2 |
VUS | 0 | 119 | 9 | 0 | 128 |
Likely Benign | 0 | 10 | 3 | 7 | 20 |
Benign | 0 | 6 | 3 | 3 | 12 |
| Total | 0 | 135 | 27 | 10 | 172 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
CNTN3 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools