Alternative titles and symbols : Orotic aciduria I; Orotate phosphoribosyltransferase and orotidylic decarboxylase deficiency; Oprt and odc deficiency; Orotidylic pyrophosphorylase and orotidylic decarboxylase deficiency; Uridine monophosphate synthase deficiency; Ump synthase deficiency; Umps deficiency;
Included titles and symbols : Orotic aciduria without megaloblastic anemia; OAWA;
Description : Orotic aciduria is a rare autosomal recessive disorder characterized by megaloblastic
anemia and orotic acid crystalluria that is frequently associated with some degree
of physical and mental retardation. These features respond to appropriate pyrimidine
replacement therapy, and most cases appear to have a good prognosis. A minority of
cases have additional features, particularly congenital malformations and immune deficiencies,
which may adversely affect this prognosis (summary by Webster et al., 2001). Bailey
(2009) reported that to that time, 2 cases of orotic aciduria without megaloblastic
anemia (OAWA) had been reported.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the uridine monophosphate synthetase gene (UMPS, 613891.0001);