Is CHEK2 p.Pro128Thr (c.382C>A) pathogenic?

CHEK2 p.Pro128Thr (c.382C>A) is classified Uncertain significance in CHEK2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-07-02). AlphaMissense: likely benign (0.1514); Absent from gnomAD v4.1; Associated with hereditary breast carcinoma.

What condition is associated with CHEK2 p.Pro128Thr (c.382C>A)?

CHEK2 p.Pro128Thr (c.382C>A) is associated with hereditary breast carcinoma, hereditary neoplastic syndrome (ClinVar).

How common is CHEK2 p.Pro128Thr (c.382C>A) in the general population?

CHEK2 p.Pro128Thr (c.382C>A) is absent from gnomAD v4.1 (gnomAD).

How is Hereditary breast cancer inherited?

Typically Autosomal dominant, Multigenic/multifactorial (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CHEK2 p.Pro128Thr (c.382C>A)?

AlphaMissense predicts likely benign (score 0.1514) — an in-silico prediction, not a clinical call.

CHEK2 p.Pro128Thr

c.382C>A · rs1555927281 · VCV460828

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.1514 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

hereditary breast carcinoma

Computational evidence

Protein change
AlphaMissense	0.1514	likely benign
REVEL	0.426	indeterminate
SaProt	LLR -10.94	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.9	GERP 1.7, phastCons 1
Regional constraint	o/e 1.02	unconstrained · MANE · 47 kb · p 0.57 · regional, not allelic
Overall
CADD	21.2	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: CHEK2
Protein: p.Pro128Thr
Coding: c.382C>A
MANE Select: NM_007194
dbSNP: rs1555927281
Type: single nucleotide variant
Location: chr22:28725305 (GRCh38)
Gene constraint: LOEUF 1.399 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.64 · 38 PDB
Residue 128: the fha domain; an α-helix

Full CHEK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Also linked: hereditary neoplastic syndrome

For Hereditary breast cancer (Orphanet):

Inheritance: Autosomal dominant, Multigenic/multifactorial
Onset: Adult, Elderly

Similar variants

CHEK2 p.Pro128Arg Uncertain significance ★ ⚠ same residue
CHEK2 p.Pro128= Likely benign ★ same residue
CHEK2 p.Pro128fs Pathogenic ★ same residue
CHEK2 p.Pro128Leu Uncertain significance ★ same residue
CHEK2 c.1008+1G>A Likely pathogenic ★★ same condition
CHEK2 c.1008+1G>T Likely pathogenic ★★ same condition
CHEK2 c.1008+2T>A Likely pathogenic ★★ same condition
CHEK2 c.1008+2T>G Likely 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/chek2-p-pro128thr (accessed [today's date]).

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