Abstract
Emerging evidence indicates that the DRD1-BDNF-DRD3 cluster plays an important role in nicotine addiction. We have performed an association analysis of 42 SNPs within these genes with cigarette consumption in a group of 341 schizophrenia patients. The ACCG haplotype consisting of four BDNF markers (Val66Met (rs6265), rs11030104, rs2049045 and rs7103411) showed an association with the risk of smoking (p = 0.0002). Both DRD1 markers tested (rs4532 and rs686) and the DRD3 marker (rs1025398) showed association with quantity of tobacco smoked (p = 0.01, 0.005 and 0.002, respectively). Our findings are preliminary; however, they support the involvement of the DRD1, BDNF and DRD3 genes in smoking behaviour.
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