ICD-11 definition : Hereditary orotic aciduria is an extremely rare (less than 20 cases identified worldwide)
autosomal recessive disorder characterized by retarded growth, anemia and excessive
urinary excretion of orotic acid. It is due to a severe deficiency in the activity
of the pyrimidine pathway enzyme uridine 5'-monophosphate (UMP) synthase (bifunctional
enzyme containing two activities: orotate phosphoribosyltransferase and orotidine
5'-monophosphate decarboxylase), coded by a single gene (UMPS) localized to chromosome
3q13.;
Hereditary orotic aciduria is an extremely rare (less than 20 cases identified worldwide)
autosomal recessive disorder characterized by retarded growth, anemia and excessive
urinary excretion of orotic acid. It is due to a severe deficiency in the activity
of the pyrimidine pathway enzyme uridine 5'-monophosphate (UMP) synthase (bifunctional
enzyme containing two activities: orotate phosphoribosyltransferase and orotidine
5'-monophosphate decarboxylase), coded by a single gene (UMPS) localized to chromosome
3q13.