Is BRCA2 p.Ala2780Pro (c.8338G>C) pathogenic?

BRCA2 p.Ala2780Pro (c.8338G>C) is classified Uncertain significance in BRCA2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-19). AlphaMissense: likely pathogenic (0.8843); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with BRCA2 p.Ala2780Pro (c.8338G>C)?

BRCA2 p.Ala2780Pro (c.8338G>C) is associated with hereditary neoplastic syndrome (ClinVar).

How common is BRCA2 p.Ala2780Pro (c.8338G>C) in the general population?

BRCA2 p.Ala2780Pro (c.8338G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about BRCA2 p.Ala2780Pro (c.8338G>C)?

AlphaMissense predicts likely pathogenic (score 0.8843) — an in-silico prediction, not a clinical call.

BRCA2 p.Ala2780Pro

c.8338G>C · VCV3261565

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.8843 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, REVEL · SaProt no call

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.8843	likely pathogenic · top 2% in BRCA2
REVEL	0.736	pathogenic-leaning
SaProt	—	not scored · why
⇒ AlphaMissense and REVEL both call this damaging; SaProt makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.2	GERP 0.21, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 35 kb · p 0.00024 · regional, not allelic
Overall
CADD	24.3	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL is an independent agreement signal.

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: BRCA2
Protein: p.Ala2780Pro
Coding: c.8338G>C
MANE Select: NM_000059
Type: single nucleotide variant
Location: chr13:32370408 (GRCh38)
Gene constraint: LOEUF 0.803 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 2780: the 'interaction with sem1' region

Full BRCA2 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

BRCA2 p.Ala2780= Likely benign ★★ same residue
BRCA2 p.Ala2780Asp Likely pathogenic ★ same residue
BRCA2 p.Ala2780Gly Uncertain significance ★ same residue
BRCA2 p.Ala2780Thr Conflicting classifications of pathogenicity ★ same residue
BRCA2 p.Ala2780fs Pathogenic/Likely pathogenic ★★ same residue
BRCA2 c.316+1G>T Pathogenic ★★★ same condition
BRCA2 c.316+2T>C Pathogenic ★★★ same condition
BRCA2 c.316+5G>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/brca2-p-ala2780pro (accessed [today's date]).

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