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CHRNB3 is more strongly associated with Fagerström Test for Cigarette Dependence-based nicotine dependence than cigarettes per day: phenotype definition changes genome-wide association studies results

Authors


Correspondence to: John P. Rice, Department of Psychiatry, Washington University School of Medicine, St Louis, MO 63110, USA. E-mail: john@zork.wustl.edu

Abstract

Aims

Nicotine dependence is a highly heritable disorder associated with severe medical morbidity and mortality. Recent meta-analyses have found novel genetic loci associated with cigarettes per day (CPD), a proxy for nicotine dependence. The aim of this paper is to evaluate the importance of phenotype definition (i.e. CPD versus Fagerström Test for Cigarette Dependence (FTCD) score as a measure of nicotine dependence) on genome-wide association studies of nicotine dependence.

Design

Genome-wide association study.

Setting

Community sample.

Participants

A total of 3365 subjects who had smoked at least one cigarette were selected from the Study of Addiction: Genetics and Environment (SAGE). Of the participants, 2267 were European Americans, 999 were African Americans.

Measurements

Nicotine dependence defined by FTCD score ≥4, CPD.

Findings

The genetic locus most strongly associated with nicotine dependence was rs1451240 on chromosome 8 in the region of CHRNB3 [odds ratio (OR) = 0.65, P = 2.4 × 10−8]. This association was further strengthened in a meta-analysis with a previously published data set (combined P = 6.7 × 10−16, total n = 4200). When CPD was used as an alternate phenotype, the association no longer reached genome-wide significance (β = −0.08, P = 0.0004).

Conclusions

Daily cigarette consumption and the Fagerstrom Test for Cigarette Dependence show different associations with polymorphisms in genetic loci.

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