Is ACVR1 p.Ala134Ser (c.400G>T) pathogenic?

ACVR1 p.Ala134Ser (c.400G>T) is classified Uncertain significance in ACVR1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-02-13). AlphaMissense: likely benign (0.1252); Very rare (popmax 0.00133%, afr).

How common is ACVR1 p.Ala134Ser (c.400G>T) in the general population?

ACVR1 p.Ala134Ser (c.400G>T) is very rare (popmax 0.00133%, afr) (gnomAD).

What do computational predictors say about ACVR1 p.Ala134Ser (c.400G>T)?

AlphaMissense predicts likely benign (score 0.1252) — an in-silico prediction, not a clinical call.

ACVR1 p.Ala134Ser

c.400G>T · rs765195676 · VCV2836751

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1252 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1252	likely benign
REVEL	0.232	benign-leaning
SaProt	LLR -5.75	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.2	GERP 2.7, phastCons 1
Regional constraint	o/e 0.86	unconstrained · MANE · 25 kb · p 0.034 · regional, not allelic
Overall
CADD	24.1	PHRED · no single calibrated threshold — expert panels disagree

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

Grpmax group 0.00133% African / African-American · 1/74,980 alleles

Overall 0.000137% 2/1,461,832 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00133%	74,980
European (non-Finnish)	8.47e-05%	1,179,980

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: ACVR1
Protein: p.Ala134Ser
Coding: c.400G>T
MANE Select: NM_001111067
dbSNP: rs765195676
Type: single nucleotide variant
Location: chr2:157778274 (GRCh38)
Gene constraint: LOEUF 0.835 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 83.70 · 85 PDB

Full ACVR1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ACVR1 p.Ala134Thr Uncertain significance ★★ ⚠ same residue
ACVR1 p.Ala134= Uncertain significance ★ same residue
ACVR1 p.Arg206His Pathogenic ★★ same type
ACVR1 p.Gly328Glu Pathogenic/Likely pathogenic ★★ same type
ACVR1 p.Gly356Asp Pathogenic/Likely pathogenic ★★ same type
ACVR1 p.Arg147Gln Uncertain significance ★★ ⚠ same type
ACVR1 p.Arg160Ter Uncertain significance ★★ same type
ACVR1 p.Arg307Gln Uncertain significance ★★ ⚠ same type

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/acvr1-p-ala134ser (accessed [today's date]).

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