Is DYSF p.Met644Ile (c.1932G>A) pathogenic?

DYSF p.Met644Ile (c.1932G>A) is classified Uncertain significance in DYSF (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-02-01). AlphaMissense: likely benign (0.167); Very rare (popmax 8.47e-05%, nfe); Associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin.

How common is DYSF p.Met644Ile (c.1932G>A) in the general population?

DYSF p.Met644Ile (c.1932G>A) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about DYSF p.Met644Ile (c.1932G>A)?

AlphaMissense predicts likely benign (score 0.167) — an in-silico prediction, not a clinical call.

DYSF p.Met644Ile

Q: What condition is associated with DYSF p.Met644Ile (c.1932G>A)?

DYSF p.Met644Ile (c.1932G>A) is associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin, autosomal recessive limb-girdle muscular dystrophy type 2B (ClinVar).

c.1932G>A · rs1299723799 · VCV959188

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.167 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

neuromuscular disease caused by qualitative or quantitative defects of dysferlin

Computational evidence

Protein change
AlphaMissense	0.167	likely benign
REVEL	0.255	benign-leaning
SaProt	LLR -6.02	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -2.4	GERP -4.4
Regional constraint	o/e 0.82	unconstrained · MANE · 18 kb · p 4.1e-05 · regional, not allelic
Overall
CADD	6.727	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM M626I vs ClinVar M644I) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,036 alleles

Overall 0.000657% 1/152,216 alleles · very rare

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: DYSF
Protein: p.Met644Ile
Coding: c.1932G>A
MANE Select: NM_001130987
dbSNP: rs1299723799
Type: single nucleotide variant
Location: chr2:71553136 (GRCh38)
Gene constraint: LOEUF 0.836 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25 · 11 PDB
Residue 644: a β-strand

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

Disease context

neuromuscular disease caused by qualitative or quantitative defects of dysferlin — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

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

Similar variants

DYSF p.Met644Thr Likely benign ★★★ same residue
DYSF p.Met644Val Uncertain significance ★★ ⚠ same residue
DYSF c.1003-3C>A Pathogenic ★★★ same condition
DYSF c.1033+1G>A Pathogenic ★★★ same condition
DYSF c.1033+4A>T Likely pathogenic ★★★ same condition
DYSF c.1149+1G>A Pathogenic ★★★ same condition
DYSF c.1149+1G>C Pathogenic ★★★ same condition
DYSF c.1149+4A>G 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/dysf-p-met644ile (accessed [today's date]).

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