Is ACTB p.Ile282Val (c.844A>G) pathogenic?

ACTB p.Ile282Val (c.844A>G) is classified Uncertain significance in ACTB (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-08). AlphaMissense: likely benign (0.2001); Very rare (popmax 8.47e-05%, nfe); Associated with Baraitser-Winter syndrome 1.

What condition is associated with ACTB p.Ile282Val (c.844A>G)?

ACTB p.Ile282Val (c.844A>G) is associated with Baraitser-Winter syndrome 1 (ClinVar).

How common is ACTB p.Ile282Val (c.844A>G) in the general population?

ACTB p.Ile282Val (c.844A>G) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about ACTB p.Ile282Val (c.844A>G)?

AlphaMissense predicts likely benign (score 0.2001) — an in-silico prediction, not a clinical call.

ACTB p.Ile282Val

c.844A>G · VCV4797720

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2001 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Baraitser-Winter syndrome 1

Computational evidence

Protein change
AlphaMissense	0.2001	likely benign
REVEL	0.745	pathogenic-leaning
SaProt	LLR -12.07	damaging
⇒ REVEL and SaProt call this damaging; AlphaMissense does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.1	GERP 1.8, phastCons 1
Regional constraint	o/e 0.11	constrained · MANE · 1,149 bp · p 1.6e-51 · regional, not allelic
Overall
CADD	24.6	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,028 alleles

Overall 6.2e-05% 1/1,614,158 alleles · very rare exomes 1/1,461,882 · genomes 0/152,276 · 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: ACTB
Protein: p.Ile282Val
Coding: c.844A>G
MANE Select: NM_001101
Type: single nucleotide variant
Location: chr7:5528144 (GRCh38)
Gene constraint: LOEUF 0.193 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 95.31 · 93 PDB
Residue 282: an α-helix

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

Disease context

Baraitser-Winter syndrome 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ACTB p.Ala22Thr Likely pathogenic ★★ same condition
ACTB p.Ala7Thr Likely pathogenic ★★ same condition
ACTB p.Arg147Cys Pathogenic ★★ same condition
ACTB p.Arg183Trp Pathogenic ★★ same condition
ACTB p.Arg196Cys Pathogenic ★★ same condition
ACTB p.Arg196His Pathogenic ★★ same condition
ACTB p.Arg196Leu Likely pathogenic ★★ same condition
ACTB p.Arg206Gln Pathogenic/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/actb-p-ile282val (accessed [today's date]).

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