Dopamine Transporter Gene Variant Higher in Alcoholics: In 102 healthy adults and 216 alcoholics, the frequency of the allele A9 was significantly higher (P = 0.01) in the group of alcoholics. There was no significant association of the allele A9 with severe withdrawal symptoms or the daily amount of alcohol consumed. Association of the dopamine transporter gene with alcoholism. Kohnke MD, et al. Tubingen, Germany. . Alcohol Alcohol. 2005 Sep-Oct;40(5):339-42.

Dopamine Transporter Gene Variant Increases Risk of Delirium, Withdrawal Seizures, Hallucinations: Previous studies have found an association between the A9 allele (nine-copy repeat) of the dopamine transporter (DAT) gene and two complications of alcohol withdrawal, namely delirium tremens (DT) and alcohol withdrawal seizures (AWS). In a study of 64 French alcoholic women, women carrying the A9 allele had more visual hallucinations during withdrawal than those without this allele (P = 0.03). However, women with the A9 allele were not more susceptible to DT or AWS than those without (P = 0.48 and P = 1.00, respectively). The A9 allele of the dopamine transporter gene increases the risk of visual hallucinations during alcohol withdrawal in alcohol-dependent women. Limosin F, et al. Creteil, France. .  Neurosci Lett. 2004 May 20;362(2):91-4.