Is GABRD p.Pro277= (c.831C>T) pathogenic?

GABRD p.Pro277= (c.831C>T) is classified Benign in GABRD (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-15). Rare (popmax 0.319%, afr); Associated with idiopathic generalized epilepsy.

What condition is associated with GABRD p.Pro277= (c.831C>T)?

GABRD p.Pro277= (c.831C>T) is associated with idiopathic generalized epilepsy (ClinVar).

How common is GABRD p.Pro277= (c.831C>T) in the general population?

GABRD p.Pro277= (c.831C>T) is rare (popmax 0.319%, afr) (gnomAD).

GABRD p.Pro277=

c.831C>T · rs148120771 · VCV460015

Benign Single submitter

Classification

Benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

rare (popmax 0.319%, afr)

Conditions

idiopathic generalized epilepsy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -14
Overall
CADD	2.011	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.319% African / African-American · 235/73,688 alleles

Filtering AF 0.285% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.273%

Overall 0.0167% 261/1,563,878 alleles · rare exomes 109/1,411,496 · genomes 152/152,382 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.319%	314
Remaining individualsnot grpmax-eligible	0.0148%	6,764
Admixed American	0.0114%	8,747
East Asian	0.00477%	20,984
South Asian	0.00117%	85,230
European (non-Finnish)	0.000692%	144,535

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: GABRD
Protein: p.Pro277=
Coding: c.831C>T
MANE Select: NM_000815
dbSNP: rs148120771
Type: single nucleotide variant
Location: chr1:2029250 (GRCh38)
Gene constraint: LOEUF 0.786 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.82 · 10 PDB
Residue 277: an α-helix

Full GABRD gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

idiopathic generalized epilepsy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

GABRD p.Pro257Leu Likely pathogenic ★★ same condition
GABRD p.Ala24Val Uncertain significance ★★ ⚠ same condition
GABRD p.Ala331Gly Uncertain significance ★★ ⚠ same condition
GABRD p.Ala437Val Uncertain significance ★★ ⚠ same condition
GABRD p.Arg23Gly Uncertain significance ★★ ⚠ same condition
GABRD p.Arg244Trp Uncertain significance ★★ ⚠ same condition
GABRD p.Arg378His Uncertain significance ★★ ⚠ same condition
GABRD p.Arg379Pro Uncertain significance ★★ ⚠ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/gabrd-p-pro277 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown