Is BRCA2 p.Arg645fs (c.1929del) pathogenic?

BRCA2 p.Arg645fs (c.1929del) is classified Pathogenic in BRCA2 (ClinVar, Expert panel, 28 submitters; last evaluated 2016-04-22). Very rare (popmax 0.00102%, nfe); Associated with breast-ovarian cancer, familial, susceptibility to, 2.

What condition is associated with BRCA2 p.Arg645fs (c.1929del)?

BRCA2 p.Arg645fs (c.1929del) is associated with breast-ovarian cancer, familial, susceptibility to, 2, hereditary breast ovarian cancer syndrome, breast cancer (ClinVar).

How common is BRCA2 p.Arg645fs (c.1929del) in the general population?

BRCA2 p.Arg645fs (c.1929del) is very rare (popmax 0.00102%, nfe) (gnomAD).

How is Hereditary breast and/or ovarian cancer syndrome inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

BRCA2 p.Arg645fs

c.1929del · rs80359316 · VCV37769

Pathogenic Expert panel

Classification

Pathogenic

ClinVar

Review

Expert panel ★★★☆

ClinVar · 28 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00102%, nfe)

Conditions

breast-ovarian cancer, familial, susceptibility to, 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 11 of 27
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 1.1	GERP -0.06, phastCons 0.002

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00102% European (non-Finnish) · 12/1,176,162 alleles

Filtering AF 0.000544% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00043%

Overall 0.000827% 12/1,451,066 alleles · very rare

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: BRCA2
Protein: p.Arg645fs
Coding: c.1929del
MANE Select: NM_000059
dbSNP: rs80359316
Type: Deletion
Location: chr13:32336284 (GRCh38)
Gene constraint: LOEUF 0.803 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 645: the 'interaction with npm1' region

Full BRCA2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

breast-ovarian cancer, familial, susceptibility to, 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary breast ovarian cancer syndrome breast cancer hereditary neoplastic syndrome hereditary breast carcinoma

For Hereditary breast and/or ovarian cancer syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult, Elderly

Similar variants

BRCA2 p.Arg645del Uncertain significance ★ same residue
BRCA2 p.Arg645Ile Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Arg645Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Arg645= Likely benign ★ same residue
BRCA2 c.316+4del Pathogenic ★★★ same condition
BRCA2 c.5217_5224del Pathogenic ★★★ same condition
BRCA2 c.68-?_316+?del Pathogenic ★★★ same condition
BRCA2 c.7008-?_7805+?del 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-arg645fs (accessed [today's date]).

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