描述
Orotic Aciduria (Orotic acidemia) is caused by a defect in uridine monophosphate synthetase (UMPS) (orotate phosphoribosyl transferase and orotidine-5’-decarboxylase), an enzyme that catalyses the formation of uridine monophosphate (UMP), an energy carrying molecule in many important biosynthetic pathways. This disease is marked by very high accumulation of orotic acid in the urine, sometimes causing urinary obstruction. Symptoms include megaloblastic anemia as well as failure to thrive.