Dopamine receptor D4 polymorphism predicts the effect of L-DOPA on gambling behavior

Eisenegger, Christoph; Knoch, Daria; Ebstein, Richard P.; Gianotti, Lorena R.R.; Sándor, Peter S; Fehr, Ernst (2010). Dopamine receptor D4 polymorphism predicts the effect of L-DOPA on gambling behavior. Biological psychiatry, 67(8), pp. 702-706. Elsevier 10.1016/j.biopsych.2009.09.021

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BACKGROUND There is ample evidence that a subgroup of Parkinson's disease patients who are treated with dopaminergic drugs develop certain behavioral addictions such as pathological gambling. The fact that only a subgroup of these patients develops pathological gambling suggests an interaction between dopaminergic drug treatment and individual susceptibility factors. These are potentially of genetic origin, since research in healthy subjects suggests that vulnerability for pathological gambling may be linked to variation in the dopamine receptor D4 (DRD4) gene. Using a pharmacogenetic approach, we investigated how variation in this gene modulates the impact of dopaminergic stimulation on gambling behavior in healthy subjects. METHODS We administered 300 mg of L-dihydroxyphenylalanine (L-DOPA) or placebo to 200 healthy male subjects who were all genotyped for their DRD4 polymorphism. Subjects played a gambling task 60 minutes after L-DOPA administration. RESULTS Without considering genetic information, L-DOPA administration did not lead to an increase in gambling propensity compared with placebo. As expected, however, an individual's DRD4 polymorphism accounted for variation in gambling behavior after the administration of L-DOPA. Subjects who carry at least one copy of the 7-repeat allele showed an increased gambling propensity after dopaminergic stimulation. CONCLUSIONS These findings demonstrate that genetic variation in the DRD4 gene determines an individual's gambling behavior in response to a dopaminergic drug challenge. They may have implications for the treatment of Parkinson's disease patients by offering a genotype approach for determining individual susceptibilities for pathological gambling and may also afford insights into the vulnerability mechanisms underlying addictive behavior.

Item Type:

Journal Article (Original Article)

Division/Institute:

07 Faculty of Human Sciences > Institute of Psychology > Social Psychology and Social Neuroscience

UniBE Contributor:

Knoch, Daria and Gianotti, Lorena

Subjects:

100 Philosophy > 150 Psychology
300 Social sciences, sociology & anthropology

ISSN:

0006-3223

Publisher:

Elsevier

Language:

English

Submitter:

Lorena Gianotti

Date Deposited:

24 Dec 2014 10:11

Last Modified:

24 Dec 2014 10:11

Publisher DOI:

10.1016/j.biopsych.2009.09.021

PubMed ID:

19914604

Uncontrolled Keywords:

Decision making, dopamine, impulse control disorder, Parkinson’s disease, pathological gambling, pharmacogenetics

BORIS DOI:

10.7892/boris.61178

URI:

https://boris.unibe.ch/id/eprint/61178

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