label: Hereditary Orotic Aciduria
label_lc: hereditary orotic aciduria
description: An extremely rare autosomal recessive inherited disorder caused by mutations in the UMPS gene. It is characterized by deficiency of the activity of the pyrimidine pathway enzyme uridine 5'-monophosphate (UMP) synthase. Clinical manifestations include growth retardation, anemia, and increased excretion of orotic acid in the urine.