Is BRCA1 p.Ser177Phe (c.530C>T) pathogenic?

BRCA1 p.Ser177Phe (c.530C>T) is classified Uncertain significance in BRCA1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-07-26). AlphaMissense: likely benign (0.2837); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with BRCA1 p.Ser177Phe (c.530C>T)?

BRCA1 p.Ser177Phe (c.530C>T) is associated with hereditary neoplastic syndrome, hereditary breast ovarian cancer syndrome (ClinVar).

How common is BRCA1 p.Ser177Phe (c.530C>T) in the general population?

BRCA1 p.Ser177Phe (c.530C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about BRCA1 p.Ser177Phe (c.530C>T)?

AlphaMissense predicts likely benign (score 0.2837) — an in-silico prediction, not a clinical call.

BRCA1 p.Ser177Phe

c.530C>T · rs753940026 · VCV825633

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.2837 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.2837	likely benign
REVEL	0.694	pathogenic-leaning
SaProt	LLR -8.05	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.53 · evaluated, not missing
Constraint at this position
Conservation	phyloP 5.7	GERP 1.8, phastCons 1
Regional constraint	o/e 0.91	unconstrained · MANE · 78 kb · p 4.8e-05 · regional, not allelic
Overall
CADD	23.9	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

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
Protein: p.Ser177Phe
Coding: c.530C>T
MANE Select: NM_007294
dbSNP: rs753940026
Type: single nucleotide variant
Location: chr17:43099792 (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

Similar variants

BRCA1 p.Ser177Thr Uncertain significance ★★ ⚠ same residue
BRCA1 p.Ser177Cys Uncertain significance ★ ⚠ same residue
BRCA1 p.Ser177fs Pathogenic ★★★ 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-ser177phe (accessed [today's date]).

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