Is BRCA1 p.Gly129= (c.387C>T) pathogenic?

BRCA1 p.Gly129= (c.387C>T) is classified Likely benign in BRCA1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-12). Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with BRCA1 p.Gly129= (c.387C>T)?

BRCA1 p.Gly129= (c.387C>T) is associated with hereditary neoplastic syndrome (ClinVar).

How common is BRCA1 p.Gly129= (c.387C>T) in the general population?

BRCA1 p.Gly129= (c.387C>T) is absent from gnomAD v4.1 (gnomAD).

BRCA1 p.Gly129=

c.387C>T · rs2552251263 · VCV2565369

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.118	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.7	GERP 1, phastCons 1
Overall
CADD	11.74	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: BRCA1
Protein: p.Gly129=
Coding: c.387C>T
MANE Select: NM_007294
dbSNP: rs2552251263
Type: single nucleotide variant
Location: chr17:43104176 (GRCh38)
Gene constraint: LOEUF 0.885 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 41.99 · 33 PDB

Full BRCA1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

BRCA1 p.Gly129Ala Uncertain significance ★★ ⚠ same residue
BRCA1 p.Gly129Val Uncertain significance ★★ ⚠ same residue
BRCA1 p.Gly129Asp Uncertain significance ★ ⚠ same residue
BRCA1 p.Gly129Cys Uncertain significance ★ ⚠ same residue
BRCA1 p.Gly129Ser Uncertain significance ★ ⚠ same residue
BRCA1 c.134+3A>T Likely pathogenic ★★★ same condition
BRCA1 c.135-1G>T Pathogenic ★★★ same condition
BRCA1 c.212+1G>A Pathogenic ★★★ 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/brca1-p-gly129 (accessed [today's date]).

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