Is BRCA2 p.Val1756= (c.5268A>G) pathogenic?

BRCA2 p.Val1756= (c.5268A>G) is classified Likely benign in BRCA2 (ClinVar, Expert panel, 19 submitters; last evaluated 2017-06-29). Very rare (popmax 0.000764%, nfe); Associated with breast-ovarian cancer, familial, susceptibility to, 2.

What condition is associated with BRCA2 p.Val1756= (c.5268A>G)?

BRCA2 p.Val1756= (c.5268A>G) is associated with breast-ovarian cancer, familial, susceptibility to, 2, hereditary breast ovarian cancer syndrome, Fanconi anemia complementation group D1 (ClinVar).

How common is BRCA2 p.Val1756= (c.5268A>G) in the general population?

BRCA2 p.Val1756= (c.5268A>G) is very rare (popmax 0.000764%, 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.Val1756=

c.5268A>G · rs199879914 · VCV135803

Likely benign Expert panel

Classification

Likely benign

ClinVar

Review

Expert panel ★★★☆

ClinVar · 19 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000764%, 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.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -0.018	GERP -4.9
Overall
CADD	0.429	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000764% European (non-Finnish) · 9/1,178,364 alleles

Filtering AF 0.000359% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00026%

Overall 0.00546% 88/1,611,942 alleles · very rare exomes 81/1,459,736 · genomes 7/152,206 · joint denominator

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.23%	435
Remaining individualsnot grpmax-eligible	0.0176%	5,674
European (non-Finnish)grpmax	0.000764%	130,929

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Val1756=
Coding: c.5268A>G
MANE Select: NM_000059
dbSNP: rs199879914
Type: single nucleotide variant
Location: chr13:32339623 (GRCh38)
Gene constraint: LOEUF 0.803 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 1756: the 'interaction with rad51' region; the 'interaction with polh' 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 Fanconi anemia complementation group D1 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.Val1756Glu Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Val1756Ile Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Val1756Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Val1756fs 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
BRCA2 c.316+5G>C 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-val1756 (accessed [today's date]).

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