Journal
BMC PSYCHIATRY
Volume 9, Issue -, Pages -Publisher
BMC
DOI: 10.1186/1471-244X-9-3
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Funding
- Department of Psychiatry of Chang Gung Memorial Hospital in Taiwan
- Wellcome Trust
- UK Medical Research council
- Medical Research Council [G9817803B] Funding Source: researchfish
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Background: Attention deficit hyperactivity disorder (ADHD) is a complex neurobehavioral disorder. The dopamine transporter gene (DAT1/SLC6A3) has been considered a good candidate for ADHD. Most association studies with ADHD have investigated the 40-base-pair variable number of tandem repeat (VNTR) polymorphism in the 3'-untranslated region of DAT1. Only few studies have reported association between promoter polymorphisms of the gene and ADHD. Methods: To investigate the association between the polymorphisms -67A/T (rs2975226) and -839C/T (rs2652511) in promoter region of DAT1 in ADHD, two samples of ADHD patients from the UK (n = 197) and Taiwan (n = 212) were genotyped, and analysed using within-family transmission disequilibrium test (TDT). Results: A significant association was found between the T allele of promoter polymorphism -67A/T and ADHD in the Taiwanese population (P = 0.001). There was also evidence of preferential transmission of the T allele of -67A/T polymorphism in combined samples from the UK and Taiwan (P = 0.003). No association was detected between the -839C/T polymorphism and ADHD in either of the two populations. Conclusion: The finding suggests that genetic variation in the promoter region of DAT1 may be a risk factor in the development of ADHD.
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