@article {6793,
	title = {Rare, low frequency and common coding variants in CHRNA5 and their contribution to nicotine dependence in European and African Americans.},
	journal = {Mol Psychiatry},
	volume = {21},
	year = {2016},
	month = {2016 May},
	pages = {601-7},
	abstract = {<p>The common nonsynonymous variant rs16969968 in the α5 nicotinic receptor subunit gene (CHRNA5) is the strongest genetic risk factor for nicotine dependence in European Americans and contributes to risk in African Americans. To comprehensively examine whether other CHRNA5 coding variation influences nicotine dependence risk, we performed targeted sequencing on 1582 nicotine-dependent cases (Fagerstr{\"o}m Test for Nicotine Dependence score⩾4) and 1238 non-dependent controls, with independent replication of common and low frequency variants using 12 studies with exome chip data. Nicotine dependence was examined using logistic regression with individual common variants (minor allele frequency (MAF)⩾0.05), aggregate low frequency variants (0.05>MAF⩾0.005) and aggregate rare variants (MAF<0.005). Meta-analysis of primary results was performed with replication studies containing 12 174 heavy and 11 290 light smokers. Next-generation sequencing with 180 {\texttimes} coverage identified 24 nonsynonymous variants and 2 frameshift deletions in CHRNA5, including 9 novel variants in the 2820 subjects. Meta-analysis confirmed the risk effect of the only common variant (rs16969968, European ancestry: odds ratio (OR)=1.3, P=3.5 {\texttimes} 10(-11); African ancestry: OR=1.3, P=0.01) and demonstrated that three low frequency variants contributed an independent risk (aggregate term, European ancestry: OR=1.3, P=0.005; African ancestry: OR=1.4, P=0.0006). The remaining 22 rare coding variants were associated with increased risk of nicotine dependence in the European American primary sample (OR=12.9, P=0.01) and in the same risk direction in African Americans (OR=1.5, P=0.37). Our results indicate that common, low frequency and rare CHRNA5 coding variants are independently associated with nicotine dependence risk. These newly identified variants likely influence the risk for smoking-related diseases such as lung cancer.</p>},
	issn = {1476-5578},
	doi = {10.1038/mp.2015.105},
	author = {Olfson, E and Saccone, N L and Johnson, E O and Chen, L-S and Culverhouse, R and Doheny, K and Foltz, S M and Fox, L and Gogarten, S M and Hartz, S and Hetrick, K and Laurie, C C and Marosy, B and Amin, N and Arnett, D and Barr, R G and Bartz, T M and Bertelsen, S and Borecki, I B and Brown, M R and Chasman, D I and van Duijn, C M and Feitosa, M F and Fox, E R and Franceschini, N and Franco, O H and Grove, M L and Guo, X and Hofman, A and Kardia, S L R and Morrison, A C and Musani, S K and Psaty, B M and Rao, D C and Reiner, A P and Rice, K and Ridker, P M and Rose, L M and Schick, U M and Schwander, K and Uitterlinden, A G and Vojinovic, D and Wang, J-C and Ware, E B and Wilson, G and Yao, J and Zhao, W and Breslau, N and Hatsukami, D and Stitzel, J A and Rice, J and Goate, A and Bierut, L J}
}
