Journal
MOLECULAR PSYCHIATRY
Volume 8, Issue 4, Pages 393-396Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.mp.4001238
Keywords
dopamine transporter gene; DAT1; ADHD; attention deficit hyperactivity disorder; behavioural disorder; association mapping
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Genetic variation of the dopamine transporter gene (DAT1) is of particular interest in the study of attention-deficit hyperactivity disorder (ADHID), since stimulant drugs interact directly with the transporter protein. Association between ADHD and the 10-repeat allele of a 40-bp VNTR polymorphism that lies within the T'-UTR of DAT1 was first reported in 1995, a finding that has been replicated in at least six independent samples from Caucasian populations. We analysed the DAT1 polymorphism in a sample of 110 Taiwanese probands with a DSM-IV diagnosis of ADHD and found evidence of increased transmission of the 10-repeat allele using TRANSMIT (chi(2) = 10.8, 1 d.f., p= 0.001, 013=2.9, 95% CI 1.4-6.3). These data give rise to a similar odds ratio to that observed in Caucasian poplulations despite a far higher frequency of the risk allele in this Taiwanese population; 82.3% in the un-transmitted parental alleles and 94.5% in the ADHD probands. These data support the role of DAT1 in ADHD susceptibility among Asian populations.
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