Is ACAD8 p.Arg29Trp (c.85C>T) pathogenic?

ACAD8 p.Arg29Trp (c.85C>T) is classified Uncertain significance in ACAD8 (ClinVar, Single submitter, 1 submitter; last evaluated 2020-12-02). AlphaMissense: likely benign (0.1437); Very rare (popmax 0.00342%, amr); Associated with isobutyryl-CoA dehydrogenase deficiency.

What condition is associated with ACAD8 p.Arg29Trp (c.85C>T)?

ACAD8 p.Arg29Trp (c.85C>T) is associated with isobutyryl-CoA dehydrogenase deficiency (ClinVar).

How common is ACAD8 p.Arg29Trp (c.85C>T) in the general population?

ACAD8 p.Arg29Trp (c.85C>T) is very rare (popmax 0.00342%, amr) (gnomAD).

How is Isobutyryl-CoA dehydrogenase deficiency inherited?

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

What do computational predictors say about ACAD8 p.Arg29Trp (c.85C>T)?

AlphaMissense predicts likely benign (score 0.1437) — an in-silico prediction, not a clinical call.

ACAD8 p.Arg29Trp

c.85C>T · rs1278727402 · VCV1349878

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1437 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00342%, amr)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

isobutyryl-CoA dehydrogenase deficiency

Computational evidence

Protein change
AlphaMissense	0.1437	likely benign
REVEL	0.354	indeterminate
SaProt	LLR -13.81	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.8	GERP -1.9, phastCons 0.88
Regional constraint	o/e 0.92	unconstrained · MANE · 11 kb · p 0.076 · regional, not allelic
Overall
CADD	22.3	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 0.00342% Admixed American · 2/58,530 alleles

Filtering AF 0.000567% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000212%

Overall 0.000829% 12/1,447,400 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00342%	29,265
Remaining individualsnot grpmax-eligible	0.00162%	61,834
South Asian	0.00112%	89,146
European (non-Finnish)	0.000681%	146,767

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: ACAD8
Protein: p.Arg29Trp
Coding: c.85C>T
MANE Select: NM_014384
dbSNP: rs1278727402
Type: single nucleotide variant
Location: chr11:134253685 (GRCh38)
Gene constraint: LOEUF 1.11 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 94.19 · 1 PDB

Full ACAD8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

isobutyryl-CoA dehydrogenase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Isobutyryl-CoA dehydrogenase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ACAD8 p.Arg206Ter Pathogenic ★★ same condition
ACAD8 p.Arg296Ter Pathogenic ★★ same condition
ACAD8 p.Gly377Ser Pathogenic/Likely pathogenic ★★ same condition
ACAD8 p.Gly96Ser Pathogenic ★★ ⚠ same condition
ACAD8 p.Met128Ile Pathogenic/Likely pathogenic ★★ same condition
ACAD8 p.Met1Thr Pathogenic/Likely pathogenic ★★ same condition
ACAD8 c.841+6A>C Uncertain significance ★★ same condition
ACAD8 c.940-13C>G Uncertain significance ★★ 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/acad8-p-arg29trp (accessed [today's date]).

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