Is CAPN3 p.Val431= (c.1293G>A) pathogenic?

CAPN3 p.Val431= (c.1293G>A) is classified Likely benign in CAPN3 (ClinVar, Single submitter, 2 submitters; last evaluated 2023-03-08). Very rare (popmax 0.004%, afr); Associated with autosomal recessive limb-girdle muscular dystrophy type 2A.

What condition is associated with CAPN3 p.Val431= (c.1293G>A)?

CAPN3 p.Val431= (c.1293G>A) is associated with autosomal recessive limb-girdle muscular dystrophy type 2A (ClinVar).

How common is CAPN3 p.Val431= (c.1293G>A) in the general population?

CAPN3 p.Val431= (c.1293G>A) is very rare (popmax 0.004%, afr) (gnomAD).

CAPN3 p.Val431=

Q: How is Calpain-3-related limb-girdle muscular dystrophy R1 inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.1293G>A · rs1009544440 · VCV990246

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Conditions

autosomal recessive limb-girdle muscular dystrophy type 2A

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 5.1	GERP -0.18, phastCons 1
Overall
CADD	8.845	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/75,040 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000494%

Overall 0.000372% 6/1,614,052 alleles · very rare exomes 6/1,461,724 · genomes 0/152,328 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.004%	25,013
Remaining individualsnot grpmax-eligible	0.0016%	62,500
European (non-Finnish)	0.000169%	589,998

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: CAPN3
Protein: p.Val431=
Coding: c.1293G>A
MANE Select: NM_000070
dbSNP: rs1009544440
Type: single nucleotide variant
Location: chr15:42399591 (GRCh38)
Gene constraint: LOEUF 0.896 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 79.18 · 5 PDB
Residue 431: the 'domain iii' region

Full CAPN3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal recessive limb-girdle muscular dystrophy type 2A — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Calpain-3-related limb-girdle muscular dystrophy R1 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

CAPN3 p.Val431Ala Uncertain significance ★★ ⚠ same residue
CAPN3 p.Val431Leu Uncertain significance ★ ⚠ same residue
CAPN3 c.1115+5G>C Pathogenic ★★★ same condition
CAPN3 c.1194-2A>G Pathogenic ★★★ same condition
CAPN3 c.1194-9A>G Pathogenic ★★★ same condition
CAPN3 c.1746-20C>G Pathogenic ★★★ same condition
CAPN3 c.1993-1G>A Pathogenic ★★★ same condition
CAPN3 c.499-1G>A 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/capn3-p-val431 (accessed [today's date]).

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