Is CAPN2 p.Val647Ala (c.1940T>C) pathogenic?

CAPN2 p.Val647Ala (c.1940T>C) is classified Uncertain significance in CAPN2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-09-15). AlphaMissense: ambiguous (0.526); Very rare (popmax 0.00333%, amr).

How common is CAPN2 p.Val647Ala (c.1940T>C) in the general population?

CAPN2 p.Val647Ala (c.1940T>C) is very rare (popmax 0.00333%, amr) (gnomAD).

What do computational predictors say about CAPN2 p.Val647Ala (c.1940T>C)?

AlphaMissense predicts ambiguous (score 0.526) — an in-silico prediction, not a clinical call.

CAPN2 p.Val647Ala

c.1940T>C · rs531849554 · VCV2362600

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.526 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00333%, amr)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.526	ambiguous
REVEL	0.167	moderately benign-leaning
SaProt	LLR -7.96	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.1	GERP 0.32, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 62 kb · p 0.00029 · regional, not allelic
Overall
CADD	23.7	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

Grpmax group 0.00333% Admixed American · 2/60,024 alleles

Filtering AF 0.000553% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000207%

Overall 0.000248% 4/1,614,166 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00333%	30,012
African / African-American	0.00266%	37,534

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: CAPN2
Protein: p.Val647Ala
Coding: c.1940T>C
MANE Select: NM_001748
dbSNP: rs531849554
Type: single nucleotide variant
Location: chr1:223771845 (GRCh38)
Gene constraint: LOEUF 1.026 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.48 · 3 PDB
Residue 647: an α-helix; the 'domain iv' region

Full CAPN2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CAPN2 p.Val647Ile Uncertain significance ★ ⚠ same residue
CAPN2 p.Ala248Thr Uncertain significance ★★ ⚠ same type
CAPN2 p.Gly72Asp Uncertain significance ★★ ⚠ same type
CAPN2 p.Asp48= Benign ★★ same type
CAPN2 p.Lys677Gln Benign ★★ ⚠ same type
CAPN2 p.Ala101Pro Uncertain significance ★ ⚠ same type
CAPN2 p.Ala171Asp Uncertain significance ★ ⚠ same type
CAPN2 p.Ala194Ser 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/capn2-p-val647ala (accessed [today's date]).

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