Is ACTC1 p.Cys376= (c.1128C>T) pathogenic?

ACTC1 p.Cys376= (c.1128C>T) is classified Likely benign in ACTC1 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-09-28). Very rare (popmax 0.0011%, sas); Associated with Cardiovascular phenotype.

What condition is associated with ACTC1 p.Cys376= (c.1128C>T)?

ACTC1 p.Cys376= (c.1128C>T) is associated with Cardiovascular phenotype, cardiomyopathy, hypertrophic cardiomyopathy (ClinVar).

How common is ACTC1 p.Cys376= (c.1128C>T) in the general population?

ACTC1 p.Cys376= (c.1128C>T) is very rare (popmax 0.0011%, sas) (gnomAD).

ACTC1 p.Cys376=

c.1128C>T · rs1891679853 · VCV920426

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 7.7	GERP 2.3, phastCons 1
Overall
CADD	10.69	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/91,076 alleles

Overall 6.2e-05% 1/1,613,866 alleles · very rare exomes 1/1,461,546 · genomes 0/152,320 · joint denominator

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: ACTC1
Protein: p.Cys376=
Coding: c.1128C>T
MANE Select: NM_005159
dbSNP: rs1891679853
Type: single nucleotide variant
Location: chr15:34790418 (GRCh38)

Full ACTC1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: cardiomyopathy hypertrophic cardiomyopathy hypertrophic cardiomyopathy 11 atrial septal defect 5 dilated cardiomyopathy 1R

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/actc1-p-cys376 (accessed [today's date]).

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