Mondo Description Guanidinoacetate methyltransferase (GAMT) deficiency is a creatine deficiency syndrome characterized by global developmental delay/intellectual disability (DD/ID), prominent speech delay, autistic/hyperactive behavioral disorders, seizures, and various types of pyramidal and/or extra-pyramidal manifestations.

Uniprot Description An autosomal recessive disorder characterized by developmental delay and regression, mental retardation, severe disturbance of expressive and cognitive speech, intractable seizures, movement disturbances, severe depletion of creatine and phosphocreatine in the brain, and accumulation of guanidinoacetic acid in brain and body fluids.

Disease Ontology Description A cerebral creatine deficiency syndrome that is characterized by severe intellectual disability, seizures, speech problems and involuntary movements, has_material_basis_in homozygous or compound heterozygous mutation in the GAMT gene on chromosome 19p13.