DAT1 gene polymorphism in alcoholism: A family-based association study

Background: The present study tests the hypothesis that the 9-repeat allele of the dopamine transporter gene (DAT1 SLC6A3) is more frequent in alcohol -dependent probands-and in particular those with severe withdrawal symptoms (seizures and/or delirium)-compared to nonalcoholics. Methods: To avoid stratification effects, the family-based association appr oach of Falk and Rubinstein was used in our sample of 87 alcohol-dependent probands and their biological parents. Results: By applying a family-based association approach, we were not able to detect significant association between allele 9 at DAT1 (SLC6A3) and alc oholism as well as between patients with or without severe withdrawal sympt oms. Conclusions: Based on our data, the impact of the 9-repeat allele of the do pamine transporter gene in alcoholism and the severity of alcohol withdrawa l symptoms is putatively not substantial. Biol Psychiatry 1999;45:652-654 ( C) 1999 Society of Biological Psychiatry.