Is ACTA1 p.Thr8= (c.24C>T) pathogenic?

ACTA1 p.Thr8= (c.24C>T) is classified Likely benign in ACTA1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-09-06). Ultra-rare (popmax 0.0165%, mid); Associated with congenital myopathy 2a, typical, autosomal dominant.

What condition is associated with ACTA1 p.Thr8= (c.24C>T)?

ACTA1 p.Thr8= (c.24C>T) is associated with congenital myopathy 2a, typical, autosomal dominant (ClinVar).

How common is ACTA1 p.Thr8= (c.24C>T) in the general population?

ACTA1 p.Thr8= (c.24C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

ACTA1 p.Thr8=

Q: How is Congenital myopathy with excess of thin filaments inherited?

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

c.24C>T · rs762659680 · VCV1937318

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

congenital myopathy 2a, typical, autosomal dominant

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 3.9	GERP 0.8, phastCons 1
Overall
CADD	12.75	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Filtering AF 0.00177% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000891%

Overall 0.000752% 11/1,461,812 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
East Asian	0.00668%	14,960
Admixed American	0.005%	20,011
South Asian	0.00439%	22,772

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: ACTA1
Protein: p.Thr8=
Coding: c.24C>T
MANE Select: NM_001100
dbSNP: rs762659680
Type: single nucleotide variant
Location: chr1:229433092 (GRCh38)
Gene constraint: LOEUF 0.931 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 95.21 · 5 PDB

Full ACTA1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

congenital myopathy 2a, typical, autosomal dominant — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Congenital myopathy with excess of thin filaments (Orphanet):

Inheritance: Autosomal dominant

Similar variants

ACTA1 c.617-5C>A Likely pathogenic ★★★ same condition
ACTA1 c.990+1G>T Pathogenic ★★★ same condition
ACTA1 p.Asp13Asn Likely pathogenic ★★★ same condition
ACTA1 p.Asp290His Pathogenic ★★★ same condition
ACTA1 p.Asp58Asn Likely pathogenic ★★★ same condition
ACTA1 p.Cys376Phe Likely pathogenic ★★★ same condition
ACTA1 p.Glu102Lys Likely pathogenic ★★★ same condition
ACTA1 p.Glu336Ala 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/acta1-p-thr8 (accessed [today's date]).

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