Is BRCA1 p.Val122= (c.366T>G) pathogenic?

BRCA1 p.Val122= (c.366T>G) is classified Likely benign in BRCA1 (ClinVar, Expert panel, 8 submitters; last evaluated 2017-06-29). Ultra-rare (popmax 0.0133%, amr); Associated with breast-ovarian cancer, familial, susceptibility to, 1.

What condition is associated with BRCA1 p.Val122= (c.366T>G)?

BRCA1 p.Val122= (c.366T>G) is associated with breast-ovarian cancer, familial, susceptibility to, 1, hereditary breast ovarian cancer syndrome, hereditary neoplastic syndrome (ClinVar).

How common is BRCA1 p.Val122= (c.366T>G) in the general population?

BRCA1 p.Val122= (c.366T>G) is ultra-rare (popmax 0.0133%, amr) (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.

BRCA1 p.Val122=

c.366T>G · rs190900046 · VCV185214

Likely benign Expert panel

Classification

Likely benign

ClinVar

Review

Expert panel ★★★☆

ClinVar · 8 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0133%, amr)

Conditions

breast-ovarian cancer, familial, susceptibility to, 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.054	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1	GERP -2.3, phastCons 0.3
Overall
CADD	5.494	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0133% Admixed American · 8/60,016 alleles

Filtering AF 0.00661% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00482%

Overall 0.000682% 11/1,613,794 alleles · ultra-rare exomes 3/1,461,486 · genomes 8/152,308 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0133%	7,502
Remaining individualsnot grpmax-eligible	0.0048%	20,833

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: BRCA1
Protein: p.Val122=
Coding: c.366T>G
MANE Select: NM_007294
dbSNP: rs190900046
Type: single nucleotide variant
Location: chr17:43104197 (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

breast-ovarian cancer, familial, susceptibility to, 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary breast ovarian cancer syndrome hereditary neoplastic syndrome

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

Inheritance: Autosomal dominant
Onset: Adult, Elderly

Similar variants

BRCA1 p.Val122Ile Uncertain significance ★★ ⚠ same residue
BRCA1 p.Val122Leu Uncertain significance ★★ ⚠ same residue
BRCA1 p.Val122Phe 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
BRCA1 c.212+1G>T Pathogenic ★★★ same condition
BRCA1 c.212+3A>G 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-val122 (accessed [today's date]).

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