Sequence variants at CHRNB3-CHRNA6 and CYP2A6 affect smoking behavior

By Thorgeir E. Thorgeirsson, Daniel Fannar Gudbjartsson, I. Surakka, J. Vink, N. Amin, F. Geller, P. Sulem, T. Rafnar, T. Esko, S. Walter and 84 more. Nature Genetics, 2010

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Smoking is a common risk factor for many diseases. We conducted genome-wide association meta-analyses for the number of cigarettes smoked per day (CPD) in smokers (n = 31,266) and smoking initiation (n = 46,481) using samples from the ENGAGE Consortium. In a second stage, we tested selected SNPs with in silico replication in the Tobacco and Genetics (TAG) and Glaxo Smith Kline (Ox-GSK) consortia cohorts (n = 45,691 smokers) and assessed some of those in a third sample of European ancestry (n = 9,040). Variants in three genomic regions associated with CPD (P < 5 × 10−8), including previously identified SNPs at 15q25 represented by rs1051730[A] (effect size = 0.80 CPD, P = 2.4 × 10−69), and SNPs at 19q13 and 8p11, represented by rs4105144[C] (effect size = 0.39 CPD, P = 2.2 × 10−12) and rs6474412-T (effect size = 0.29 CPD, P = 1.4 × 10−8), respectively. Among the genes at the two newly associated loci are genes encoding nicotine-metabolizing enzymes (CYP2A6 and CYP2B6) and nicotinic acetylcholine receptor subunits (CHRNB3 and CHRNA6), all of which have been highlighted in previous studies of smoking and nicotine dependence. Nominal associations with lung cancer were observed at both 8p11 (rs6474412[T], odds ratio (OR) = 1.09, P = 0.04) and 19q13 (rs4105144[C], OR = 1.12, P = 0.0006).

Subfields: Genetics, Molecular Biology, Physiology

View Paper: https://www.semanticscholar.org/paper/b192d2d5678e02f8debf532fc3073d0ef5f6b4d8

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Citations in the corpus

Cytochrome P450 enzymes in drug metabolism: regulation of gene expression, enzyme activities, and impact of genetic variation. (2013, background): “CYP2A6 variants were also associated to smoking behavour (cigarettes smoked per day) at genome-wide significance (Thorgeirsson et al., 2010).”