Is CAPN3 p.Leu87Val (c.259C>G) pathogenic?

CAPN3 p.Leu87Val (c.259C>G) is classified Uncertain significance in CAPN3 (ClinVar, Multiple submitters, 8 submitters; last evaluated 2025-10-01). AlphaMissense: likely benign (0.237); Ultra-rare (popmax 0.079%, sas); Associated with muscular dystrophy, limb-girdle, autosomal dominant 4.

What condition is associated with CAPN3 p.Leu87Val (c.259C>G)?

CAPN3 p.Leu87Val (c.259C>G) is associated with muscular dystrophy, limb-girdle, autosomal dominant 4, autosomal recessive limb-girdle muscular dystrophy type 2A (ClinVar).

How common is CAPN3 p.Leu87Val (c.259C>G) in the general population?

CAPN3 p.Leu87Val (c.259C>G) is ultra-rare (popmax 0.079%, sas) (gnomAD).

What do computational predictors say about CAPN3 p.Leu87Val (c.259C>G)?

AlphaMissense predicts likely benign (score 0.237) — an in-silico prediction, not a clinical call.

CAPN3 p.Leu87Val

Q: How is Calpain-3-related limb-girdle muscular dystrophy D4 inherited?

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

c.259C>G · rs558925493 · VCV551283

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 8 submitters

AlphaMissense

likely benign

0.237 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.079%, sas)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

muscular dystrophy, limb-girdle, autosomal dominant 4

Computational evidence

Protein change
AlphaMissense	0.237	likely benign
REVEL	0.724	pathogenic-leaning
SaProt	LLR -8.38	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP 2.7, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 52 kb · p 0.21 · regional, not allelic
Overall
CADD	25.5	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 0.079% South Asian · 72/91,084 alleles

Filtering AF 0.0643% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0589%

Overall 0.0075% 121/1,614,234 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.079%	1,265
Middle Eastern	0.033%	3,031
Remaining individualsnot grpmax-eligible	0.0176%	5,683
European (non-Finnish)	0.0028%	35,759
East Asian	0.00223%	44,886
Admixed American	0.00167%	60,028
African / African-American	0.00133%	75,064

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.Leu87Val
Coding: c.259C>G
MANE Select: NM_000070
dbSNP: rs558925493
Type: single nucleotide variant
Location: chr15:42360064 (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 87: the calpain catalytic domain; an α-helix

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

Disease context

muscular dystrophy, limb-girdle, autosomal dominant 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal recessive limb-girdle muscular dystrophy type 2A

For Calpain-3-related limb-girdle muscular dystrophy D4 (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult
Prevalence: <1 / 1 000 000 (Worldwide)

Similar variants

CAPN3 p.Leu87Phe Likely pathogenic ★ same residue
CAPN3 p.Leu87fs Pathogenic ★★★ 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-leu87val (accessed [today's date]).

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