Is CHEK2 p.Pro426= (c.1278T>A) pathogenic?

CHEK2 p.Pro426= (c.1278T>A) is classified Likely benign in CHEK2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-02). Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with CHEK2 p.Pro426= (c.1278T>A)?

CHEK2 p.Pro426= (c.1278T>A) is associated with hereditary neoplastic syndrome (ClinVar).

How common is CHEK2 p.Pro426= (c.1278T>A) in the general population?

CHEK2 p.Pro426= (c.1278T>A) is absent from gnomAD v4.1 (gnomAD).

CHEK2 p.Pro426=

c.1278T>A · rs1060504689 · VCV2452075

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

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.
Splicing
SpliceAI	Δ0.48	acceptor loss · deltas
Constraint at this position
Conservation	phyloP 5.1	GERP 0.54, phastCons 1
Overall
CADD	14.36	PHRED · no single calibrated threshold — expert panels disagree

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.Pro426=
Coding: c.1278T>A
MANE Select: NM_007194
dbSNP: rs1060504689
Type: single nucleotide variant
Location: chr22:28695224 (GRCh38)
Gene constraint: LOEUF 1.399 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.64 · 38 PDB
Residue 426: the protein kinase domain

Full CHEK2 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

Similar variants

CHEK2 p.Pro426Ala Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro426Arg Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro426His Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro426Leu Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro426Ser Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro426Thr Uncertain significance ★★ ⚠ same residue
CHEK2 c.1008+1G>A Likely pathogenic ★★ same condition
CHEK2 c.1008+1G>T 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-pro426 (accessed [today's date]).

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