title: Genetic structure of the dopamine receptor D4 gene (DRD4) and lack of association with schizophrenia in Japanese patients.
abstract: In order to investigate the contribution of genetic variation in the human dopamine receptor D4 gene (DRD4) to the risk of developing schizophrenia, we carried out a genetic analysis of 27 polymorphisms in 216 schizophrenic patients and 243 healthy controls from the Kyushu region of Japan. Twenty-two single nucleotide polymorphisms (SNPs) and five insertion/deletion polymorphisms were analyzed in this study, including four novel SNPs and a novel mononucleotide repeat. Linkage disequilibrium (LD) and haplotype analyses reveal weak LD across the DRD4 gene. In univariate analysis female individuals with allele -521C had a higher risk for schizophrenia. However, this finding was not significant after correction for multiple hypothesis testing. No other polymorphisms or haplotypes differed between schizophrenic patients and controls. Likewise, multivariate analyses did not reveal any statistically significant associations.
authors.affiliation: Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-Ku, Fukuoka 812-8582, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mitsuyasu
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kawasaki
authors.forename: Hideaki
authors.initials: H
authors.lastname: Ninomiya
authors.forename: Naoko
authors.initials: N
authors.lastname: Kinukawa
authors.forename: Takeharu
authors.initials: T
authors.lastname: Yamanaka
authors.forename: Tomoko
authors.initials: T
authors.lastname: Tahira
authors.forename: Vincent P
authors.initials: VP
authors.lastname: Stanton
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Springett
authors.forename: Kenshi
authors.initials: K
authors.lastname: Hayashi
authors.forename: Nobutada
authors.initials: N
authors.lastname: Tashiro
authors.forename: Shigenobu
authors.initials: S
authors.lastname: Kanba
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016009:Chi-Square Distribution; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011110:Polymorphism, Genetic; D050638:Receptors, Dopamine D4 / Q000235:genetics*; D012559:Schizophrenia / Q000453:epidemiology / Q000235:genetics*
chemical_list: C493599:DRD4 protein, human; D050638:Receptors, Dopamine D4