Is DYSF p.Ile1226= (c.3678C>T) pathogenic?

DYSF p.Ile1226= (c.3678C>T) is classified Conflicting classifications of pathogenicity in DYSF (ClinVar, Conflicting submitters, 8 submitters; last evaluated 2026-02-01). Rare (popmax 0.138%, amr); Associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin.

What condition is associated with DYSF p.Ile1226= (c.3678C>T)?

DYSF p.Ile1226= (c.3678C>T) is associated with neuromuscular disease caused by qualitative or quantitative defects of dysferlin, autosomal recessive limb-girdle muscular dystrophy type 2B, Miyoshi muscular dystrophy 1 (ClinVar).

How common is DYSF p.Ile1226= (c.3678C>T) in the general population?

DYSF p.Ile1226= (c.3678C>T) is rare (popmax 0.138%, amr) (gnomAD).

DYSF p.Ile1226=

c.3678C>T · rs148858485 · VCV284874

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 8 submitters

gnomAD v4.1

Rare

rare (popmax 0.138%, amr)

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 -15	GERP -4.2
Overall
CADD	1.398	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.138% Admixed American · 83/60,002 alleles

Filtering AF 0.132% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.13%

Overall 0.11% 1,776/1,613,988 alleles · rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.138%	723
European (non-Finnish)	0.138%	726
Remaining individualsnot grpmax-eligible	0.08%	1,250
African / African-American	0.0133%	7,494
Finnishnot grpmax-eligible	0.00469%	21,311
South Asian	0.00439%	22,771

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.Ile1226=
Coding: c.3678C>T
MANE Select: NM_001130987
dbSNP: rs148858485
Type: single nucleotide variant
Location: chr2:71598667 (GRCh38)
Gene constraint: LOEUF 0.836 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25 · 11 PDB
Residue 1226: a β-strand; the c2 4 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 Miyoshi muscular dystrophy 1

Similar variants

DYSF p.Ile1226Met Conflicting classifications of pathogenicity ★ ⚠ 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
DYSF c.1276+5G>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/dysf-p-ile1226 (accessed [today's date]).

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