Is CHEK2 p.Arg346fs (c.1014_1036dup) pathogenic?

CHEK2 p.Arg346fs (c.10141036dup) is classified Pathogenic in CHEK2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-02-18). Absent from gnomAD; Associated with hereditary breast carcinoma.

What condition is associated with CHEK2 p.Arg346fs (c.1014_1036dup)?

CHEK2 p.Arg346fs (c.1014_1036dup) is associated with hereditary breast carcinoma (ClinVar).

How common is CHEK2 p.Arg346fs (c.1014_1036dup) in the general population?

CHEK2 p.Arg346fs (c.1014_1036dup) is absent from gnomAD (gnomAD).

How is Hereditary breast cancer inherited?

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

CHEK2 p.Arg346fs

c.1014_1036dup · rs2145817523 · VCV1416288

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

hereditary breast carcinoma

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 10 of 15
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 7.6	GERP 1.8, phastCons 1

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

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CHEK2
Protein: p.Arg346fs
Coding: c.1014_1036dup
MANE Select: NM_007194
dbSNP: rs2145817523
Type: Duplication
Location: chr22:28696959 (GRCh38)
Gene constraint: LOEUF 1.399 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.64 · 38 PDB
Residue 346: the protein kinase domain

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

For Hereditary breast cancer (Orphanet):

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

Similar variants

CHEK2 p.Arg346Gly Uncertain significance ★★ ⚠ same residue
CHEK2 p.Arg346Ser Uncertain significance ★★ ⚠ same residue
CHEK2 p.Arg346= Likely benign ★★ same residue
CHEK2 p.Arg346Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
CHEK2 p.Arg346His Conflicting classifications of pathogenicity ★ ⚠ same residue
CHEK2 p.Arg346Pro Uncertain significance ★ ⚠ same residue
CHEK2 p.Arg431Ter Pathogenic/Likely pathogenic ★★ same condition
CHEK2 p.Asp162fs 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-arg346fs (accessed [today's date]).

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