COQ5
Chr 12ARcoenzyme Q5, methyltransferase
Also known as: COQ10D9
The COQ5 protein is a methyltransferase required for ubiquinone (coenzyme Q10) biosynthesis, specifically converting 2-decaprenyl-6-methoxy-1,4-benzoquinol to 2-decaprenyl-3-methyl-6-methoxy-1,4-benzoquinol in the mitochondrial inner membrane. Mutations cause primary coenzyme Q10 deficiency 9, which follows autosomal recessive inheritance. This gene has low constraint against loss-of-function variants (pLI 0.00003, LOEUF 0.95), and detailed clinical information is available in GeneReviews.
Moderate evidence — consider for supplementary testing
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
Tolerant to missense variation
Predictions shown for reference only — model trained on dominant genes, not applicable to AR conditions.
The Badonyi & Marsh prediction model was trained exclusively on dominant disease genes. Predictions are not reliable for genes with autosomal recessive inheritance and are shown at reduced opacity for reference only.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.
ClinVar Variant Classifications
92 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 0 | 0 | 13 | 0 | 13 |
Likely Pathogenic | 1 | 0 | 4 | 0 | 5 |
VUS | 1 | 46 | 5 | 0 | 52 |
Likely Benign | 0 | 6 | 2 | 3 | 11 |
Benign | 0 | 0 | 2 | 2 | 4 |
Conflicting | — | 1 | |||
| Total | 2 | 52 | 26 | 5 | 86 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
COQ5 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools