Is FKRP p.Arg35Trp (c.103C>T) pathogenic?

FKRP p.Arg35Trp (c.103C>T) is classified Uncertain significance in FKRP (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-12). AlphaMissense: likely benign (0.1839); Very rare (popmax 0.000255%, nfe); Associated with muscular dystrophy-dystroglycanopathy, type A.

What condition is associated with FKRP p.Arg35Trp (c.103C>T)?

FKRP p.Arg35Trp (c.103C>T) is associated with muscular dystrophy-dystroglycanopathy, type A (ClinVar).

How common is FKRP p.Arg35Trp (c.103C>T) in the general population?

FKRP p.Arg35Trp (c.103C>T) is very rare (popmax 0.000255%, nfe) (gnomAD).

How is Walker-Warburg syndrome inherited?

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

What do computational predictors say about FKRP p.Arg35Trp (c.103C>T)?

AlphaMissense predicts likely benign (score 0.1839) — an in-silico prediction, not a clinical call.

FKRP p.Arg35Trp

c.103C>T · rs1157545139 · VCV1434932

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1839 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000255%, nfe)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

muscular dystrophy-dystroglycanopathy, type A

Computational evidence

Protein change
AlphaMissense	0.1839	likely benign
REVEL	0.398	indeterminate
SaProt	LLR -9.04	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.7	GERP -0.96, phastCons 0.91
Regional constraint	o/e 1.06	unconstrained · MANE · 1,484 bp · p 0.11 · regional, not allelic
Overall
CADD	18.48	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.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000255% European (non-Finnish) · 3/1,177,220 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000206% 3/1,455,004 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: FKRP
Protein: p.Arg35Trp
Coding: c.103C>T
MANE Select: NM_024301
dbSNP: rs1157545139
Type: single nucleotide variant
Location: chr19:46755553 (GRCh38)
Gene constraint: LOEUF 1.543 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.08 · 8 PDB

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

Disease context

muscular dystrophy-dystroglycanopathy, type A — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Walker-Warburg syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Infancy, Neonatal
Prevalence: <1 / 1 000 000 (United Kingdom)

Similar variants

FKRP p.Arg35Gln Uncertain significance ★★ ⚠ same residue
FKRP p.Arg35= Likely benign ★ same residue
STRN4 p.Ser35Pro Uncertain significance ★ ⚠ same residue
FKRP p.Ala157Pro Pathogenic/Likely pathogenic ★★ same condition
FKRP p.Ala321Glu Pathogenic/Likely pathogenic ★★ ⚠ same condition
FKRP p.Ala455Asp Pathogenic ★★ same condition
FKRP p.Arg176Ter Pathogenic/Likely pathogenic ★★ same condition
FKRP p.Arg275Cys Pathogenic/Likely 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/fkrp-p-arg35trp (accessed [today's date]).

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