Is BRCA2 p.Glu45Ter (c.133G>T) pathogenic?

BRCA2 p.Glu45Ter (c.133G>T) is classified Pathogenic in BRCA2 (ClinVar, Expert panel, 2 submitters; last evaluated 2017-12-15). Very rare (popmax 0.00167%, amr); Associated with breast-ovarian cancer, familial, susceptibility to, 2.

How common is BRCA2 p.Glu45Ter (c.133G>T) in the general population?

BRCA2 p.Glu45Ter (c.133G>T) is very rare (popmax 0.00167%, 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.

BRCA2 p.Glu45Ter

Q: What condition is associated with BRCA2 p.Glu45Ter (c.133G>T)?

BRCA2 p.Glu45Ter (c.133G>T) is associated with breast-ovarian cancer, familial, susceptibility to, 2, hereditary breast carcinoma (ClinVar).

c.133G>T · rs397507581 · VCV51104

Pathogenic Expert panel

Classification

Pathogenic

ClinVar

Review

Expert panel ★★★☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

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	nonsense (stop-gain)	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 3 of 27
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 8.3	GERP 2.3, phastCons 1
Overall
CADD	36.0	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/60,004 alleles

Overall 6.2e-05% 1/1,613,832 alleles · very rare exomes 1/1,461,676 · genomes 0/152,156 · joint denominator

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.Glu45Ter
Coding: c.133G>T
MANE Select: NM_000059
dbSNP: rs397507581
Type: single nucleotide variant
Location: chr13:32319142 (GRCh38)
Gene constraint: LOEUF 0.803 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 45: the 'disordered' 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 carcinoma

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

Inheritance: Autosomal dominant
Onset: Adult, Elderly

Similar variants

BRCA2 p.Glu45Lys Conflicting classifications of pathogenicity ★ ⚠ same residue
BRCA2 p.Glu45fs Pathogenic ★★★ same residue
BRCA2 p.Glu45= Likely benign ★ 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
BRCA2 c.475+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/brca2-p-glu45ter (accessed [today's date]).

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