PCBD1
Chr 10ARpterin-4 alpha-carbinolamine dehydratase 1
Also known as: DCOH, PCBD, PCD, PHS
The encoded protein functions as a dehydratase in tetrahydrobiopterin biosynthesis and as a cofactor for HNF1A-dependent transcription. Mutations cause BH4-deficient hyperphenylalaninemia type D through autosomal recessive inheritance. Enzyme deficiency disrupts tetrahydrobiopterin metabolism, leading to elevated phenylalanine levels.
Primary Disease Associations & Inheritance
Definitive — sufficient evidence for diagnostic panels
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Highly tolerant — LoF variants common in population
Mild missense constraint
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
0 submitted variants in ClinVar
Protein Context — Lollipop Plot
PCBD1 · 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