Abstract
Objective This study examined the genetic association between variation in the cannabinoid receptor 1 (CNR1) gene and cannabis dependence symptoms. Method Adolescent and young adult subjects were recruited from three settings: a treatment program for youth with substance use disorders, the criminal justice system, and the community. A case–control sample consisted of 224 cases who endorsed at least one dependence symptom and 108 controls who tried cannabis but endorsed no symptoms. A family-based sample of 219 families was also analyzed. Results Case–control analysis identified a nominal association between SNP rs1049353 and having one or more cannabis dependence symptoms ( p = .029), but the association did not hold up in a combined sample. Family-based analysis found a trend for the same SNP ( p = .07). We did not replicate a previous report that SNP rs806380 was associated with the development of cannabis dependence. Conclusion These results provide inconclusive evidence of association between rs1049353/rs806380 and the development of cannabis dependence, and underscore the importance of replicating results of genetic association studies. Additional family-based studies are needed to clarify the role of the CNR1 gene, and its various SNPs, in the development of cannabis use disorders.
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