A dopamine transporter deficiency syndrome characterized by infantile onset of chorea, dystonia, ballismus, and orolingual dyskinesia followed by progressive parkinsonism-dystonia that has_material_basis_in homozygous or compound heterozygous mutation in the SLC6A3 gene on chromosome 5p15.33. Another distinct feature is an elevated homovanillic acid to hydroxyindoleacetic acid ratio in cerebrospinal fluid.