S100G
Chr XS100 calcium binding protein G
Also known as: CABP, CABP1, CABP9K, CALB3
Calbindin D9K is a vitamin D-dependent calcium-binding protein that buffers cytoplasmic calcium and facilitates ATP-dependent calcium transport, particularly in intestinal absorption. Mutations in S100G cause autosomal recessive congenital cataracts, facial dysmorphism, and neuropathy (CCFDN), a disorder affecting the eyes, nervous system, and facial development. This gene is not highly constrained against loss-of-function variants, and the condition follows autosomal recessive inheritance.
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
S100G · 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