Is DMD p.Lys64Thr (c.191A>C) pathogenic?

DMD p.Lys64Thr (c.191A>C) is classified Uncertain significance in DMD (ClinVar, Single submitter, 2 submitters; last evaluated 2021-09-01). AlphaMissense: ambiguous (0.4301); Very rare (popmax 0.00219%, amr); Associated with Duchenne muscular dystrophy.

What condition is associated with DMD p.Lys64Thr (c.191A>C)?

DMD p.Lys64Thr (c.191A>C) is associated with Duchenne muscular dystrophy, cardiomyopathy, Becker muscular dystrophy (ClinVar).

How common is DMD p.Lys64Thr (c.191A>C) in the general population?

DMD p.Lys64Thr (c.191A>C) is very rare (popmax 0.00219%, amr) (gnomAD).

How is Duchenne muscular dystrophy inherited?

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

What do computational predictors say about DMD p.Lys64Thr (c.191A>C)?

AlphaMissense predicts ambiguous (score 0.4301) — an in-silico prediction, not a clinical call.

DMD p.Lys64Thr

c.191A>C · rs1482045034 · VCV1056062

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

ambiguous

0.4301 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00219%, amr)

Conditions

Duchenne muscular dystrophy

Computational evidence

Protein change
AlphaMissense	0.4301	ambiguous
REVEL	0.741	pathogenic-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.2	GERP 1.6, phastCons 1
Regional constraint	o/e 1.36	unconstrained · MANE · 1,863 kb · p 2.4e-62 · regional, not allelic
Overall
CADD	24.7	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00219% Admixed American · 1/45,671 alleles

Overall 0.000166% 2/1,207,494 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00219%	45,671
Remaining individualsnot grpmax-eligible	0.0021%	47,515

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: DMD
Protein: p.Lys64Thr
Coding: c.191A>C
MANE Select: NM_004006
dbSNP: rs1482045034
Type: single nucleotide variant
Location: chrX:32844856 (GRCh38)
Residue 64: the calponin-homology (ch) 1 domain; an α-helix; the 'actin-binding' region; the 'ank2- and ank-3 binding' region

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

Disease context

Duchenne muscular dystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: cardiomyopathy Becker muscular dystrophy

For Duchenne muscular dystrophy (Orphanet):

Inheritance: X-linked recessive
Onset: Childhood
Prevalence: 1-9 / 100 000 (Worldwide)

Similar variants

DMD p.Lys64Ile Uncertain significance ★ ⚠ same residue
DMD p.Lys64= Likely benign ★ same residue
DMD c.10086+1G>A Pathogenic ★★ same condition
DMD c.10086+1G>T Pathogenic ★★ same condition
DMD c.10086+2T>C Pathogenic ★★ same condition
DMD c.10087-2A>G Pathogenic/Likely pathogenic ★★ same condition
DMD c.10223+1G>A Pathogenic ★★ same condition
DMD c.10223+1G>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/dmd-p-lys64thr (accessed [today's date]).

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