Is CAPN1 p.Pro136fs (c.407del) pathogenic?

CAPN1 p.Pro136fs (c.407del) is classified Pathogenic in CAPN1 (ClinVar, Single submitter, 2 submitters; last evaluated 2026-02-01). Absent from gnomAD; Associated with autosomal recessive spastic paraplegia type 76.

What condition is associated with CAPN1 p.Pro136fs (c.407del)?

CAPN1 p.Pro136fs (c.407del) is associated with autosomal recessive spastic paraplegia type 76 (ClinVar).

How common is CAPN1 p.Pro136fs (c.407del) in the general population?

CAPN1 p.Pro136fs (c.407del) is absent from gnomAD (gnomAD).

How is Autosomal recessive spastic paraplegia type 76 inherited?

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

CAPN1 p.Pro136fs

c.407del · rs875989845 · VCV225767

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

autosomal recessive spastic paraplegia type 76

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 4 of 22
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -1.1	GERP -4.5, phastCons 0.004

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CAPN1
Protein: p.Pro136fs
Coding: c.407del
MANE Select: NM_005186
dbSNP: rs875989845
Type: Deletion
Location: chr11:65183542 (GRCh38)
Gene constraint: LOEUF 0.977 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.03 · 5 PDB
Residue 136: the calpain catalytic domain

Full CAPN1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal recessive spastic paraplegia type 76 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal recessive spastic paraplegia type 76 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adult

Similar variants

CAPN1 p.Arg377fs Pathogenic/Likely pathogenic ★★ same condition
CAPN1 p.Gly208fs Pathogenic ★★ same condition
CAPN1 p.Pro136Leu Uncertain significance ★★ ⚠ same residue
CAPN1 c.843+114del Benign/Likely benign ★★ same condition
CAPN1 p.Val178_Phe186del Uncertain significance ★ same condition
CAPN1 c.1605+5G>A Pathogenic/Likely pathogenic ★★ same condition
CAPN1 c.267+2T>C Pathogenic/Likely pathogenic ★★ same condition
CAPN1 c.338-1G>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/capn1-p-pro136fs (accessed [today's date]).

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