The human dopamine transporter (DAT1) gene is localized to chromosome 5p15.3 by 
in situ hybridization and PCR amplification of rodent somatic cell hybrid DNA. 
Analysis of a 40-bp repeat in the 3' untranslated region of the message revealed 
variable numbers of the repeat ranging from 3 to 11 copies. These results will 
aid in the investigation of a role for this gene in genetic disorders of the 
dopaminergic system in humans.