Is BRCA1 c.4675+2T>G pathogenic?

BRCA1 c.4675+2T>G is classified Pathogenic/Likely pathogenic in BRCA1 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-11-13). Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with BRCA1 c.4675+2T>G?

BRCA1 c.4675+2T>G is associated with hereditary neoplastic syndrome, hereditary breast ovarian cancer syndrome, breast-ovarian cancer, familial, susceptibility to, 1 (ClinVar).

How common is BRCA1 c.4675+2T>G in the general population?

BRCA1 c.4675+2T>G is absent from gnomAD v4.1 (gnomAD).

BRCA1 c.4675+2T>G

rs879255293 · VCV252396

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

Consequence

canonical splice-site (±1/±2)

predicted LoF

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Consequence	canonical splice-site (±1/±2)	predicted loss-of-function in a haploinsufficient gene (ClinGen)
Splicing
Splice region	donor +2	canonical splice dinucleotide (donor +2) · inside the BP7-excluded zone
SpliceAI	Δ0.96	donor loss, 2 bp away · raw score · deltas
Pangolin	Δ0.87	loss · gain 0.68 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 8.9	GERP 1.7, phastCons 1
Non-coding constraint	Z 2.49	1 kb window · o/e 0.78 · regional · uncalibrated
Overall
CADD	34.0	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

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: BRCA1
Coding: c.4675+2T>G
MANE Select: NM_007294
dbSNP: rs879255293
Type: single nucleotide variant
Location: chr17:43074329 (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

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary breast ovarian cancer syndrome breast-ovarian cancer, familial, susceptibility to, 1

Similar variants

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
BRCA1 c.213-12A>G Pathogenic ★★★ same condition
BRCA1 c.213-15A>G Likely pathogenic ★★★ same condition
BRCA1 c.302-1G>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/brca1-c-4675-plus-2t-g (accessed [today's date]).

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