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Pubmed ID :15389757
Publication Date : //

Association of the -141C Del variant of the dopamine D2 receptor (DRD2) with positive family history and suicidality in German alcoholics.


Several lines of evidence indicate an involvement of the dopaminergic system in alcoholism, withdrawal, suicidality, and attention-deficit hyperactivity disorder (ADHD). The functionally relevant -141C Ins/Del polymorphism located upstream to exon 1 in the 5'-region of the dopamine D2 receptor (DRD2) gene might be an interesting candidate gene. We investigated a sample of 1,126 well-characterized, primary chronic alcoholics of German descent according to a phenotype-genotype strategy, i.e., alcoholics suffering from severe withdrawal complications such as seizure or delirium, family history positive (FH+) alcoholics, alcoholics with an antisocial personality disorder (ASPD), alcoholics with an ADHD, and type 1 or type 2 alcoholics according to Cloninger's typology. Compared to the control subjects, there was a significant excess of the -141C Del allele in alcoholics with a paternal and grandpaternal history of alcoholism and in alcoholic subgroups with suicidality or without a history of withdrawal symptoms. There were no significant differences in allele frequency between the entire group or subgroups of alcoholics and healthy controls. Therefore, the -141C Del variant of the DRD2 might be a protective factor against the development of withdrawal symptoms. However, it might also be a risk factor in a highly burdened subgroup of alcoholics with a paternal and grandpaternal history of alcoholism and it might contribute to the substantially higher likelihood of suicide in alcoholics.

Authors : Johann Monika , Putzhammer Albert , Eichhammer Peter , Wodarz Norbert ,

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