QDPR
Function
Catalyzes the conversion of quinonoid dihydrobiopterin into tetrahydrobiopterin.
Involvement in disease
Hyperphenylalaninemia, BH4-deficient, C
HPABH4C
Rare autosomal recessive disorder characterized by hyperphenylalaninemia and severe neurologic symptoms (malignant hyperphenylalaninemia) including axial hypotonia and truncal hypertonia, abnormal thermogenesis, and microcephaly. These signs are attributable to depletion of the neurotransmitters dopamine and serotonin, whose syntheses are controlled by tryptophan and tyrosine hydroxylases that use BH-4 as cofactor. Patients do not respond to phenylalanine-restricted diet. HPABH4C is lethal if untreated.
None
The disease is caused by variants affecting the gene represented in this entry.
Sequence Similarities
Belongs to the short-chain dehydrogenases/reductases (SDR) family.
Alternative names
DHPR, SDR33C1, QDPR, Dihydropteridine reductase, HDHPR, Quinoid dihydropteridine reductase, Short chain dehydrogenase/reductase family 33C member 1