NCIt related terms : Methionine Synthase Deficiency; Tetrahydrofolate Methyltransferase Deficiency;
NCIt definition : A rare autosomal dominant inherited metabolic disorder characterized by deficiency
of the enzyme tetrahydrofolate-methyltransferase. It results in the abnormal metabolism
of methylcobalamin. Signs and symptoms include mental retardation, megaloblastic anemia,
hypotonia, epilepsy, and hepatosplenomegaly.;