Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4332470 | Brain Research | 2006 | 4 Pages |
Abstract
Association between attention deficit hyperactivity disorder (ADHD) and the 10-repeat allele of a polymorphism (a 40 bp variable number of tandem repeats) in the dopamine transporter gene (DAT1) has been reported by several groups. In this study, we examined whether either allele of the DAT1 core promoter â67 functional polymorphism is associated with ADHD in a case/control study. The allele and genotype frequencies of the polymorphism were studied in 110 patients and 120 controls, which were matched on the basis of sex, age and ethnicity. The genotype frequencies in the patients group were as follows: AA 19.2%; AT 65.2%; TT 15.4% vs. the genotype frequencies in the control group: AA 47.5%; AT 43.3%; TT 9.2% [Ï2 = 20.73, df = 2, P â¤Â 0.0001]. The T allele of the â67A/T polymorphism revealed an â¼1.56-fold excess in the patients group comparing with the controls [Ï2 = 14.50, df = 1 (P â¤Â 0.001). For the first time, these findings provide tentative evidence of the contribution of the DAT1 gene core promoter polymorphism to the etiopathophysiology of ADHD at least in the Iranian population that we have studied. Further work is warranted to confirm this finding and to assess its generalization to other ethnic groups.
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Authors
Mina Ohadi, Elham Shirazi, Mehdi Tehranidoosti, Narges Moghimi, Mohammad R. Keikhaee, Sima Ehssani, Ali Aghajani, Hossein Najmabadi,