Is ACTC1 p.Phe377= (c.1131C>T) pathogenic?

ACTC1 p.Phe377= (c.1131C>T) is classified Likely benign in ACTC1 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-08-31). Very rare (popmax 0.005%, amr); Associated with Cardiovascular phenotype.

What condition is associated with ACTC1 p.Phe377= (c.1131C>T)?

ACTC1 p.Phe377= (c.1131C>T) is associated with Cardiovascular phenotype, hypertrophic cardiomyopathy, hypertrophic cardiomyopathy 11 (ClinVar).

How common is ACTC1 p.Phe377= (c.1131C>T) in the general population?

ACTC1 p.Phe377= (c.1131C>T) is very rare (popmax 0.005%, amr) (gnomAD).

ACTC1 p.Phe377=

c.1131C>T · rs764683976 · VCV1141190

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

Conditions

Cardiovascular phenotype

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 6.8	GERP 1.4, phastCons 1
Overall
CADD	8.419	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.005% Admixed American · 3/60,004 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000668%

Overall 0.000496% 8/1,613,730 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	20,001
European (non-Finnish)	0.000424%	235,998

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.Phe377=
Coding: c.1131C>T
MANE Select: NM_005159
dbSNP: rs764683976
Type: single nucleotide variant
Location: chr15:34790415 (GRCh38)
Gene constraint: LOEUF 0.511 · pLI 0.97 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 95.47 · 16 PDB

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

Similar variants

ACTC1 p.Phe377Val Uncertain significance ★ ⚠ same residue
ACTC1 p.Glu101Lys Pathogenic ★★★ same condition
ACTC1 p.Gly345Val Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Pro266Leu Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Val56Ile Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Ala297Ser Pathogenic ★★ ⚠ same condition
ACTC1 p.Gly247Asp Pathogenic/Likely pathogenic ★★ same condition
ACTC1 p.Thr128Ile 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/actc1-p-phe377 (accessed [today's date]).

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