Is MSH3 p.Arg86fs (c.257del) pathogenic?

MSH3 p.Arg86fs (c.257del) is classified Pathogenic in MSH3 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-11-19). Absent from gnomAD.

How common is MSH3 p.Arg86fs (c.257del) in the general population?

MSH3 p.Arg86fs (c.257del) is absent from gnomAD (gnomAD).

MSH3 p.Arg86fs

c.257del · rs1749286902 · VCV855984

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

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 2 of 24
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 1.9	GERP -0.64, phastCons 0.95

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: MSH3
Protein: p.Arg86fs
Coding: c.257del
MANE Select: NM_002439
dbSNP: rs1749286902
Type: Deletion
Location: chr5:80656430 (GRCh38)
Gene constraint: LOEUF 1.027 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.48 · 25 PDB
Residue 86: the 'disordered' region; the 'interaction with exo1' region

Full MSH3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

MSH3 p.Arg86Lys Uncertain significance ★★ ⚠ same residue
MSH3 p.Arg86Thr Uncertain significance ★★ ⚠ same residue
MSH3 p.Arg86Gly Uncertain significance ★ ⚠ same residue
MSH3 p.Arg86= Likely benign ★ same residue
MSH3 c.1341-3_1341-2del Likely pathogenic ★★ same type
MSH3 c.1564_1568+18del Pathogenic/Likely pathogenic ★★ same type
MSH3 c.2253+3_2253+7del Pathogenic/Likely pathogenic ★★ same type
MSH3 c.2814delG Pathogenic ★★ same type

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/msh3-p-arg86fs (accessed [today's date]).

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