GABRG1
Chr 4gamma-aminobutyric acid type A receptor subunit gamma1
The gamma-1 subunit forms part of GABA(A) receptors, heteropentameric chloride channels that mediate inhibitory neurotransmission in the brain by allowing chloride influx when activated by GABA. Mutations cause autosomal recessive early infantile epileptic encephalopathy-89, characterized by severe seizures beginning in early infancy. This gene is not highly constrained against loss-of-function variants, which is consistent with the recessive inheritance pattern observed in affected patients.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
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
87 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 | 18 | 0 | 18 |
Likely Pathogenic | 0 | 0 | 1 | 0 | 1 |
VUS | 0 | 58 | 5 | 0 | 63 |
Likely Benign | 0 | 0 | 0 | 1 | 1 |
Benign | 0 | 0 | 0 | 0 | 0 |
| Total | 0 | 58 | 24 | 1 | 83 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
GABRG1 · 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