Is CAPN8 p.Gln256Arg (c.767A>G) pathogenic?

CAPN8 p.Gln256Arg (c.767A>G) is classified Likely benign in CAPN8 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-21). AlphaMissense: likely benign (0.0713); Absent from gnomAD v4.1.

How common is CAPN8 p.Gln256Arg (c.767A>G) in the general population?

CAPN8 p.Gln256Arg (c.767A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CAPN8 p.Gln256Arg (c.767A>G)?

AlphaMissense predicts likely benign (score 0.0713) — an in-silico prediction, not a clinical call.

CAPN8 p.Gln256Arg

c.767A>G · VCV4218932

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0713 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0713	likely benign
REVEL	0.126	moderately benign-leaning
SaProt	LLR -7.49	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.72	GERP -2, phastCons 1
Regional constraint	o/e 1.08	unconstrained · MANE · 124 kb · p 0.038 · regional, not allelic
Overall
CADD	10.74	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: CAPN8
Protein: p.Gln256Arg
Coding: c.767A>G
MANE Select: NM_001143962
Type: single nucleotide variant
Location: chr1:223625851 (GRCh38)
Gene constraint: LOEUF 1.184 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.15 · 1 PDB
Residue 256: the calpain catalytic domain

Full CAPN8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CAPN8 p.Ala112Val Uncertain significance ★ ⚠ same type
CAPN8 p.Ala136Glu Uncertain significance ★ ⚠ same type
CAPN8 p.Ala136Thr Uncertain significance ★ ⚠ same type
CAPN8 p.Ala194Ser Uncertain significance ★ ⚠ same type
CAPN8 p.Ala231Ser Uncertain significance ★ ⚠ same type
CAPN8 p.Ala234Val Uncertain significance ★ ⚠ same type
CAPN8 p.Ala247Val Uncertain significance ★ ⚠ same type
CAPN8 p.Ala248Ser Uncertain significance ★ ⚠ 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/capn8-p-gln256arg (accessed [today's date]).

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