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Hereditary orotic aciduria

Disease definition

A rare 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.


Classification level: Disorder
  • Synonym(s):
    • Orotidylic decarboxylase deficiency
    • Uridine monophosphate synthetase deficiency
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: E79.8
  • OMIM: 258900
  • UMLS: C0220987  C0268130
  • MeSH: C537136
  • GARD: 5429
  • MedDRA: 10052621
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