CAPN3 p.Glu508=
c.1524G>A · rs886043432 · VCV286592
ClinGen expert panel — Limb Girdle Muscular Dystrophy VCEP
Pathogenic for autosomal recessive limb-girdle muscular dystrophy. Applied ACMG criteria (verbatim):
PM2_Supporting PP4_Strong PM3_Strong PP3
Curation rationale (ClinGen, verbatim)
The NM_000070.3: c.1524G>A variant in CAPN3 is a synonymous (silent) variant (p.Glu508=) that affects the last nucleotide of exon 11. This variant has been detected in at least seven individuals with LGMD (PMID: 26404900, 17236769, 17994539, 16141003, 32528171; ClinVar SCV001423802.2 internal data communication). Of those individuals, at least three were compound heterozygous, and in at least two, the variant was confirmed in trans with a pathogenic variant (c.550del p.(Thr184ArgfsTer36), 2.0 pts, PMID: 17236769, 17994539). In addition, at least one individual was homozygous for the variant (0.5 pts, PMID: 17994539) (PM3_Strong). At least one patient with this variant displayed progressive limb girdle muscle weakness as well as absent expression of calpain-3 protein, which is highly specific for CAPN3-related LGMD (PP4_Strong; PMID: 17236769). This variant is absent from gnomAD v2.1.1 and v.3.1.2 (PM2_Supporting). The SpliceAI prediction score for this variant is 0.66 (donor loss), which is greater than the VCEP threshold of ≥ 0.50 and suggestive of an impact on splicing (PP3). In summary, this variant meets the criteria to be classified as Pathogenic for autosomal recessive limb girdle muscular dystrophy based on the ACMG/AMP criteria applied, as specified by the ClinGen LGMD VCEP (LGMD VCEP specifications version 1.0.0; 01/07/2025): PM3_Strong, PP4_Strong, PM2_Supporting, PP3.
ClinGen Evidence Repository → · reported verbatim, not re-tallied by Sugi Variant.
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal. | ||
| Splicing | ||
| SpliceAI | Δ0.66 | donor loss · deltas |
|---|---|---|
| Pangolin | Δ0.73 | loss · gain 0.01 · agrees with SpliceAI · independent |
| Constraint at this position | ||
| Conservation | phyloP 12 | GERP 2.7, phastCons 1 |
| Overall | ||
| CADD | 20.2 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
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
- CAPN3
- Protein
- p.Glu508=
- Coding
- c.1524G>A
- MANE Select
- NM_000070
- dbSNP
- rs886043432
- Type
- single nucleotide variant
- Location
- chr15:42401810 (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 508
- the 'domain iii' region
Similar variants
- CAPN3 p.Glu508Lys 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
- CAPN3 p.Ala702Val 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-glu508 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown