Classic Dopamine Transporter Deficiency Syndrome, also known as infantile parkinsonism-dystonia 1, is related to parkinsonism-dystonia 2, infantile-onset and parkinsonism-dystonia 1, infantile-onset. An important gene associated with Classic Dopamine Transporter Deficiency Syndrome is SLC6A3 (Solute Carrier Family 6 Member 3).