GJB5
Chr 1gap junction protein beta 5
Also known as: CX31.1
The protein is a gap junction connexin that forms intercellular channels allowing diffusion of small molecules between neighboring cells, particularly important for epidermal differentiation and environmental sensing. Mutations in this gene cause erythrokeratodermia variabilis et progressiva, a rare autosomal dominant skin disorder characterized by transient patches of redness and progressive hyperkeratotic plaques. The gene shows low constraint against loss-of-function variants (pLI near 0, LOEUF 1.83), consistent with its role in a non-lethal dermatologic condition.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Highly tolerant — LoF variants common in population
Mild missense constraint
This gene has evidence for multiple mechanisms of pathogenicity (gain-of-function and dominant-negative). Both the Badonyi & Marsh prediction and the broader genomic evidence point to gain-of-function 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
0 submitted variants in ClinVar
Protein Context — Lollipop Plot
GJB5 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
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