label: orotic aciduria
label_lc: 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."