Journal
ADDICTION BIOLOGY
Volume 13, Issue 3-4, Pages 435-439Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1369-1600.2008.00098.x
Keywords
attentional bias; dopamine D4 receptor; DRD4 VNTR; genotype; modified Stroop; nicotine addiction
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Funding
- Cancer Research UK Funding Source: Medline
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Recently, a variable number of tandem repeats (VNTR) polymorphism in the dopamine D4 receptor (DRD4) gene has been reported to be associated with greater craving and more attention to smoking cues, following a cue-elicited craving procedure. We investigated whether the DRD4 VNTR 7-repeat polymorphism is associated with selective processing of smoking-related stimuli, using a modified Stroop task, and whether smoking status moderates this association. Thirty-one current smokers and 17 ex-smokers attended a single testing session and completed the modified Stroop task. The experimental design included two between-subjects factors of smoking status (current smoker, ex-smoker) and DRD4 genotype (short, long). The DRD4 VNTR polymorphism was associated with selective processing of smoking-related stimuli in ex-smokers but not in current smokers. Our data, therefore, provide partial support for our primary hypothesis and extend on previous work which suggests a role for variation at the DRD4 locus in modulating reactivity to drug-related cues.
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