3-Phosphoglycerate dehydrogenase (3-PGDH) deficiency is a rare autosomal recessive disorder caused by a defect in the synthesis of the amino acid L-serine characterized clinically by congenital microcephaly, psychomotor retardation, and infantile onset of intractable seizures. The biochemical abnormalities associated with this disorder are low concentrations of L-serine, D-serine, and glycine in cerebrospinal fluid (CSF) and plasma. Mutations have been identified in PHGDH, the gene encoding 3-PGDH.
