Is DYSF p.Ser42= (c.126C>T) pathogenic?

DYSF p.Ser42= (c.126C>T) is classified Likely benign in DYSF (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-20). Ultra-rare (popmax 0.0223%, eas); Associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin.

How common is DYSF p.Ser42= (c.126C>T) in the general population?

DYSF p.Ser42= (c.126C>T) is ultra-rare (popmax 0.0223%, eas) (gnomAD).

DYSF p.Ser42=

Q: What condition is associated with DYSF p.Ser42= (c.126C>T)?

DYSF p.Ser42= (c.126C>T) is associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin, autosomal recessive limb-girdle muscular dystrophy type 2B (ClinVar).

c.126C>T · rs369755508 · VCV730957

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0223%, eas)

Conditions

neuromuscular disease caused by qualitative or quantitative defects of dysferlin

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -13	GERP -3
Overall
CADD	2.614	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0223% East Asian · 10/44,880 alleles

Filtering AF 0.012% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00916%

Overall 0.0026% 42/1,614,006 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0223%	4,488
South Asian	0.00769%	13,012
Remaining individualsnot grpmax-eligible	0.0048%	20,827
Admixed American	0.00333%	30,002
African / African-American	0.00267%	37,466
European (non-Finnish)	0.00153%	65,555

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.Ser42=
Coding: c.126C>T
MANE Select: NM_001130987
dbSNP: rs369755508
Type: single nucleotide variant
Location: chr2:71480917 (GRCh38)
Gene constraint: LOEUF 0.836 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25 · 11 PDB
Residue 42: the c2 1 domain

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 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
DYSF c.1276+5G>A Pathogenic ★★★ same condition
DYSF c.1276+5G>C 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-ser42 (accessed [today's date]).

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