title: Association study of nicotinic acetylcholine receptor genes identifies a novel lung cancer susceptibility locus near CHRNA1 in African-Americans.
abstract: Studies in European and East Asian populations have identified lung cancer susceptibility loci in nicotinic acetylcholine receptor (nAChR) genes on chromosome 15q25.1 which also appear to influence smoking behaviors. We sought to determine if genetic variation in nAChR genes influences lung cancer susceptibly in African-Americans, and evaluated the association of these cancer susceptibility loci with smoking behavior. A total of 1308 African-Americans with lung cancer and 1241 African-American controls from three centers were genotyped for 378 single nucleotide polymorphisms (SNPs) spanning the sixteen human nAChR genes. Associations between SNPs and the risk of lung cancer were estimated using logistic regression, adjusted for relevant covariates. Seven SNPs in three nAChR genes were significantly associated with lung cancer at a strict Bonferroni-corrected level, including a novel association on chromosome 2 near the promoter of CHRNA1 (rs3755486: OR = 1.40, 95% CI = 1.18-1.67, P = 1.0 x 10-4). Association analysis of an additional 305 imputed SNPs on 2q31.1 supported this association. Publicly available expression data demonstrated that the rs3755486 risk allele correlates with increased CHRNA1 gene expression. Additional SNP associations were observed on 15q25.1 in genes previously associated with lung cancer, including a missense variant in CHRNA5 (rs16969968: OR = 1.60, 95% CI = 1.27-2.01, P = 5.9 x 10-5). Risk alleles on 15q25.1 also correlated with an increased number of cigarettes smoked per day among the controls. These findings identify a novel lung cancer risk locus on 2q31.1 which correlates with CHRNA1 expression and replicate previous associations on 15q25.1 in African-Americans.
authors.affiliation: Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, USA.
authors.forename: Kyle M
authors.initials: KM
authors.lastname: Walsh
authors.forename: Christopher I
authors.initials: CI
authors.lastname: Amos
authors.forename: Angela S
authors.initials: AS
authors.lastname: Wenzlaff
authors.forename: Ivan P
authors.initials: IP
authors.lastname: Gorlov
authors.forename: Jennette D
authors.initials: JD
authors.lastname: Sison
authors.forename: Xifeng
authors.initials: X
authors.lastname: Wu
authors.forename: Margaret R
authors.initials: MR
authors.lastname: Spitz
authors.forename: Helen M
authors.initials: HM
authors.lastname: Hansen
authors.forename: Emily Y
authors.initials: EY
authors.lastname: Lu
authors.forename: Chongjuan
authors.initials: C
authors.lastname: Wei
authors.forename: Huifeng
authors.initials: H
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Stacy M
authors.initials: SM
authors.lastname: Lloyd
authors.forename: Marsha L
authors.initials: ML
authors.lastname: Frazier
authors.forename: Paige M
authors.initials: PM
authors.lastname: Bracci
authors.forename: Michael F
authors.initials: MF
authors.lastname: Seldin
authors.forename: Margaret R
authors.initials: MR
authors.lastname: Wrensch
authors.forename: Ann G
authors.initials: AG
authors.lastname: Schwartz
authors.forename: John K
authors.initials: JK
authors.lastname: Wiencke
mesh_terms: D001741:Black or African American / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D055106:Genome-Wide Association Study; D005838:Genotype; D006801:Humans; D008175:Lung Neoplasms / Q000208:ethnology* / Q000235:genetics*; D008297:Male; D020641:Polymorphism, Single Nucleotide; D011978:Receptors, Nicotinic / Q000235:genetics*; D012307:Risk Factors
chemical_list: C523021:CHRNA1 protein, human; D011978:Receptors, Nicotinic