Association Between CHRNA3 and CHRNA5 Nicotine Receptor Subunit Gene Variants and Nicotine Dependence in an Isolated Population of Kashubians in Poland

摘要

BACKGROUND Genome-wide and allelic association studies have shown the contribution of [i]CHRNA5-A3-B4[/i] nicotinic receptor subunit gene cluster within chromosome 15 to nicotine dependence (ND). While an association between several single-nucleotide polymorphisms (SNPs) at that locus and smoking quantity (cigarettes per day; CPD) has been well recognized, there are some inconsistencies in demonstrating the influence of these SNPs on other ND phenotypes. This uncertainty motivated us to examine the association of 3 selected SNPs ([i]CHRNA3[/i] rs1051730, rs6495308, and [i]CHRNA5[/i] rs55853898) with ND in an isolated population of Kashubians from Poland.? MATERIAL AND METHODS The study sample consisted of 788 current daily smokers. ND was assessed by CPD, the Fagerstrom Test for Nicotine Dependence (FTND), its brief version - Heavy Smoking Index (HSI), and time to first cigarette after waking (TTF). The correlation between studied SNPs and dichotomized values of ND measures was assessed in the regression analysis. Bonferroni corrected p-value of 0.017 was set for a type 1 error.? RESULTS We found a robust association between risk allele A of rs1051730 and CPD >10 (odds ratio (OR)=1.77, 95% confidence interval (CI): 1.20-2.59, p=0.004), and a weak association, which did not survive correction for multiple testing, with FTND 34. No associations between studied SNPs and HSI or TTF were demonstrated.? CONCLUSIONS Our findings confirm that rs1051730 influences ND phenotype, as defined by CPD.