Phosphoserine aminotransferase (PSAT) deficiency is a disorder of serine biosynthesis characterized biochemically by low plasma and CSF concentrations of serine and glycine and clinically by intractable seizures, acquired microcephaly, hypertonia, and psychomotor retardation. The biochemical and clinical features of PSAT deficiency shared some of the features of 3-PGDH deficiency [DS:H01079]. Mutations in the PSAT1 gene have been identified.
