Is ACADSB p.Ser87= (c.261G>A) pathogenic?

ACADSB p.Ser87= (c.261G>A) is classified Likely benign in ACADSB (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-13). Ultra-rare (popmax 0.0291%, eas); Associated with 2-methylbutyryl-CoA dehydrogenase deficiency.

What condition is associated with ACADSB p.Ser87= (c.261G>A)?

ACADSB p.Ser87= (c.261G>A) is associated with 2-methylbutyryl-CoA dehydrogenase deficiency (ClinVar).

How common is ACADSB p.Ser87= (c.261G>A) in the general population?

ACADSB p.Ser87= (c.261G>A) is ultra-rare (popmax 0.0291%, eas) (gnomAD).

How is 2-methylbutyryl-CoA dehydrogenase deficiency inherited?

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

ACADSB p.Ser87=

c.261G>A · rs369590466 · VCV1932616

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0291%, eas)

Conditions

2-methylbutyryl-CoA dehydrogenase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.024	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.49	GERP -2.1, phastCons 0.84
Overall
CADD	11.93	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0291% East Asian · 13/44,734 alleles

Filtering AF 0.0171% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0136%

Overall 0.00248% 40/1,611,252 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0291%	3,441
Middle Eastern	0.0165%	6,070
South Asian	0.0033%	30,333
Admixed American	0.00167%	59,970
European (non-Finnish)	0.00161%	61,989
Remaining individualsnot grpmax-eligible	0.0016%	62,388
Finnishnot grpmax-eligible	0.00156%	63,996
African / African-American	0.00134%	74,826

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: ACADSB
Protein: p.Ser87=
Coding: c.261G>A
MANE Select: NM_001609
dbSNP: rs369590466
Type: single nucleotide variant
Location: chr10:123037805 (GRCh38)
Gene constraint: LOEUF 0.891 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 91.47 · 1 PDB

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

Disease context

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

For 2-methylbutyryl-CoA dehydrogenase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ACADSB p.Ser87Leu Uncertain significance ★ ⚠ same residue
ACADSB c.1128+1G>A Likely pathogenic ★★ same condition
ACADSB c.1228+1G>A Likely pathogenic ★★ same condition
ACADSB c.303+3A>G Pathogenic/Likely pathogenic ★★ same condition
ACADSB p.Cys308Tyr Pathogenic/Likely pathogenic ★★ same condition
ACADSB p.Gln99Ter Pathogenic/Likely pathogenic ★★ same condition
ACADSB p.Glu387Lys Pathogenic/Likely pathogenic ★★ ⚠ same condition
ACADSB p.Gly410Ser 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/acadsb-p-ser87 (accessed [today's date]).

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