Is DLD p.Gln268Arg (c.803A>G) pathogenic?

DLD p.Gln268Arg (c.803A>G) is classified Uncertain significance in DLD (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-27). AlphaMissense: likely pathogenic (0.6854); Very rare (popmax 0.00133%, afr); Associated with pyruvate dehydrogenase E3 deficiency.

What condition is associated with DLD p.Gln268Arg (c.803A>G)?

DLD p.Gln268Arg (c.803A>G) is associated with pyruvate dehydrogenase E3 deficiency (ClinVar).

How common is DLD p.Gln268Arg (c.803A>G) in the general population?

DLD p.Gln268Arg (c.803A>G) is very rare (popmax 0.00133%, afr) (gnomAD).

How is Maple syrup urine disease inherited?

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

What do computational predictors say about DLD p.Gln268Arg (c.803A>G)?

AlphaMissense predicts likely pathogenic (score 0.6854) — an in-silico prediction, not a clinical call.

DLD p.Gln268Arg

c.803A>G · rs2032249701 · VCV2440801

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6854 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

pyruvate dehydrogenase E3 deficiency

Computational evidence

Protein change
AlphaMissense	0.6854	likely pathogenic
REVEL	0.507	indeterminate
SaProt	LLR -12.45	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2.1, phastCons 1
Regional constraint	o/e 0.89	unconstrained · MANE · 28 kb · p 0.0061 · regional, not allelic
Overall
CADD	26.8	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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 · 1/75,034 alleles

Overall 0.000137% 2/1,461,444 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00133%	75,034
European (non-Finnish)	8.48e-05%	1,179,834

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: DLD
Protein: p.Gln268Arg
Coding: c.803A>G
MANE Select: NM_000108
dbSNP: rs2032249701
Type: single nucleotide variant
Location: chr7:107915624 (GRCh38)
Gene constraint: LOEUF 0.727 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.69 · 17 PDB
Residue 268: an α-helix

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

Disease context

pyruvate dehydrogenase E3 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Maple syrup urine disease (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Worldwide)

Similar variants

DLD p.Gln268Ter Likely pathogenic ★ same residue
DLD p.Gln268fs Pathogenic/Likely pathogenic ★★ same residue
DLD c.1464+1G>A Pathogenic/Likely pathogenic ★★ same condition
DLD c.198+1G>T Likely pathogenic ★★ same condition
DLD c.39+1G>A Likely pathogenic ★★ same condition
DLD c.40-2A>G Likely pathogenic ★★ same condition
DLD c.583-1G>C Likely pathogenic ★★ same condition
DLD c.684+1G>T 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/dld-p-gln268arg (accessed [today's date]).

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