title: Association between smoking habits and dopamine receptor D2 taqI A A2 allele in Japanese males: a confirmatory study.
abstract: Our previous study showed that A2 allele of dopamine D2 (DRD2) TaqI A polymorphism related to smoking habits, which was opposed to the results of studies for Caucasians. In order to confirm our finding, a similar study was conducted for the first-visit outpatients of Aichi Cancer Center Hospital, who participated in HERPACC-II (Hospital-based Epidemiologic Research Program at Aichi Cancer Center-II). Among consecutive 1,577 first-visit patients between November 2000 and February 2001, 800 patients provided a 7 ml of peripheral blood. Smoking habit data were available for 798 participants. Excluding five participants aged < 20 years or > 80 years, the remaining 793 participants (346 males and 447 females) were analyzed. The DRD2 genotype was determined by a new method, polymerase chain reaction with confronting two-pair primers (PCR-CTPP). In males, current smokers were 35.3% of individuals with A1A1 genotype, 43.1% of individuals with A1A2 genotype, and 57.0% of individuals with A2A2 genotype, while in females, they were 19.6%, 14.6%, and 10.9%, respectively. Age-adjusted odds ratio (OR) of current smoking relative to A1A1 was 1.61 (95% confidence interval, 0.71-3.46) for A1A2 and 2.32 (1.02-5.29) for A2A2 in males, and 0.72 (0.32-1.61) and 0.51 (0.22-1.18) in females, respectively. The present study indicated that Japanese males with A2A2 genotype have a higher risk of being current smokers. No association for Japanese females suggested that female smoking behavior is differently affected in biological and/or psychological manner.
authors.affiliation: Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hamajima
authors.forename: Hidemi
authors.initials: H
authors.lastname: Ito
authors.forename: Keitaro
authors.initials: K
authors.lastname: Matsuo
authors.forename: Toshiko
authors.initials: T
authors.lastname: Saito
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tajima
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ando
authors.forename: Kimihide
authors.initials: K
authors.lastname: Yoshida
authors.forename: Takashi
authors.initials: T
authors.lastname: Takahashi
mesh_terms: D000483:Alleles; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D017448:Receptors, Dopamine D2 / Q000235:genetics*; D012907:Smoking / Q000453:epidemiology / Q000235:genetics*
chemical_list: D017448:Receptors, Dopamine D2