Hereditary orotic aciduria

What is Hereditary orotic aciduria?

A rare genetic disorder of pyrimidine metabolism characterized by early onset of megaloblastic anemia, global developmental delay, and failure to thrive, associated with massive urinary overexcretion of orotic acid (sometimes with orotic acid crystalluria). Patients without megaloblastic anemia, but with additional manifestations such as epilepsy, have also been reported.

Other condition names

  • Orotidylic decarboxylase deficiency
  • Uridine monophosphate synthetase deficiency

Inheritance type

Autosomal recessive

Prevalence

  • Worldwide: <1 in 1,000 000

Age of Onset

  • Infancy
  • Neonatal
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