Is ETFA p.Thr266= (c.798G>A) pathogenic?

ETFA p.Thr266= (c.798G>A) is classified Likely benign in ETFA (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-19). Very rare (popmax 0.00223%, eas); Associated with multiple acyl-CoA dehydrogenase deficiency.

What condition is associated with ETFA p.Thr266= (c.798G>A)?

ETFA p.Thr266= (c.798G>A) is associated with multiple acyl-CoA dehydrogenase deficiency (ClinVar).

How common is ETFA p.Thr266= (c.798G>A) in the general population?

ETFA p.Thr266= (c.798G>A) is very rare (popmax 0.00223%, eas) (gnomAD).

How is Multiple acyl-CoA dehydrogenase deficiency inherited?

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

ETFA p.Thr266=

c.798G>A · rs764478797 · VCV750906

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Conditions

multiple acyl-CoA dehydrogenase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.3	GERP -3.5, phastCons 0.001
Overall
CADD	6.894	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,824 alleles

Filtering AF 7.9e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 5.4e-05%

Overall 0.000343% 5/1,458,660 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00223%	44,824
European (non-Finnish)	0.00034%	294,541

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: ETFA
Protein: p.Thr266=
Coding: c.798G>A
MANE Select: NM_000126
dbSNP: rs764478797
Type: single nucleotide variant
Location: chr15:76274430 (GRCh38)
Gene constraint: LOEUF 1.166 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.00 · 4 PDB
Residue 266: a binding site; the 'domain ii' region; a UniProt-annotated variant site (in ga2a; decreased electron transfer activity)

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

Disease context

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

For Multiple acyl-CoA dehydrogenase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 1 000 000 (United States)

Similar variants

ETFA p.Thr266Met Pathogenic ★★ same residue
ETFA c.186+1G>A Likely pathogenic ★★ same condition
ETFA c.39+1G>A Likely pathogenic ★★ same condition
ETFA c.451+1G>A Likely pathogenic ★★ same condition
ETFA c.452-2A>G Likely pathogenic ★★ same condition
ETFA c.664+1G>A Likely pathogenic ★★ same condition
ETFA c.665-1G>A Likely pathogenic ★★ same condition
ETFA p.Arg122Lys 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/etfa-p-thr266 (accessed [today's date]).

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