Is ACTG2 p.Thr149Arg (c.446C>G) pathogenic?

ACTG2 p.Thr149Arg (c.446C>G) is classified Uncertain significance in ACTG2 (ClinVar, No assertion criteria, 1 submitter; last evaluated 2020-04-28). AlphaMissense: likely pathogenic (0.9922); Absent from gnomAD v4.1; Associated with visceral myopathy 1.

What condition is associated with ACTG2 p.Thr149Arg (c.446C>G)?

ACTG2 p.Thr149Arg (c.446C>G) is associated with visceral myopathy 1 (ClinVar).

How common is ACTG2 p.Thr149Arg (c.446C>G) in the general population?

ACTG2 p.Thr149Arg (c.446C>G) is absent from gnomAD v4.1 (gnomAD).

How is Familial visceral myopathy inherited?

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

What do computational predictors say about ACTG2 p.Thr149Arg (c.446C>G)?

AlphaMissense predicts likely pathogenic (score 0.9922) — an in-silico prediction, not a clinical call.

ACTG2 p.Thr149Arg

c.446C>G · rs1680075415 · VCV973101

Uncertain significance No assertion criteria

Classification

Uncertain significance

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9922 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

visceral myopathy 1

Computational evidence

Protein change
AlphaMissense	0.9922	likely pathogenic
REVEL	0.952	strongly pathogenic-leaning
SaProt	LLR -15.73	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 2.1, phastCons 1
Regional constraint	o/e 0.48	unconstrained · MANE · 18 kb · p 3.5e-30 · regional, not allelic
Overall
CADD	28.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ACTG2
Protein: p.Thr149Arg
Coding: c.446C>G
MANE Select: NM_001615
dbSNP: rs1680075415
Type: single nucleotide variant
Location: chr2:73909134 (GRCh38)
Gene constraint: LOEUF 0.626 · pLI 0.28 (gnomAD)
Structure: AlphaFold pLDDT 95.46 · 4 PDB
Residue 149: a UniProt-annotated variant site (in vscm1)

Full ACTG2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

visceral myopathy 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial visceral myopathy (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages

Similar variants

ACTG2 p.Thr149Lys Uncertain significance ★ ⚠ same residue
ACTG2 p.Ala205Thr Pathogenic ★★ same condition
ACTG2 p.Arg148Cys Likely pathogenic ★★ same condition
ACTG2 p.Arg178Cys Pathogenic ★★ same condition
ACTG2 p.Arg178His Pathogenic ★★ same condition
ACTG2 p.Arg178Leu Pathogenic ★★ same condition
ACTG2 p.Arg211Gln Pathogenic/Likely pathogenic ★★ same condition
ACTG2 p.Arg257Cys 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/actg2-p-thr149arg (accessed [today's date]).

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