title: No association between schizophrenia and homozygosity at the D3 dopamine receptor gene.
abstract: The D3 dopamine receptor gene is an important candidate gene for schizophrenia, since (because of its almost exclusive expression in the limbic system) it combines the dopamine receptor hypothesis with the limbic system hypothesis of schizophrenia. A BalI restriction fragment length polymorphism of the D3 dopamine receptor gene has been typed in 107 schizophrenic patients and 98 normal controls from Sichuan (China). With regard to alleles or genotypes, no significant differences were obtained between controls from Europe and China, between patients and controls, and between patient subgroups and controls. These results indicate a lack of association between schizophrenia and the D3 dopamine receptor gene in our sample. Our findings are at variance with reports of a significant excess of homozygosity at the D3 dopamine receptor gene in schizophrenic patients from Wales (United Kingdom) and Alsace (France). In conclusion, further studies will be needed with larger samples of patients from Wales and Alsace as well as with samples of different racial groups to prove or disprove the initial positive association between schizophrenia and genotypes of the D3 dopamine receptor gene.
authors.affiliation: Department of Psychiatry, Kiel University Hospital, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Yang
authors.forename: T
authors.initials: T
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Wiese
authors.forename: L
authors.initials: L
authors.lastname: Lannfelt
authors.forename: P
authors.initials: P
authors.lastname: Sokoloff
authors.forename: C T
authors.initials: CT
authors.lastname: Xu
authors.forename: Z
authors.initials: Z
authors.lastname: Zeng
authors.forename: J C
authors.initials: JC
authors.lastname: Schwartz
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: H W
authors.initials: HW
authors.lastname: Moises
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D002681:China; D015252:Deoxyribonucleases, Type II Site-Specific; D005060:Europe; D005260:Female; D005787:Gene Frequency; D008040:Genetic Linkage; D006720:Homozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D012150:Polymorphism, Restriction Fragment Length; D011954:Receptors, Dopamine / Q000235:genetics*; D017448:Receptors, Dopamine D2; D050637:Receptors, Dopamine D3; D012559:Schizophrenia / Q000235:genetics*
chemical_list: C493593:DRD3 protein, human; D011954:Receptors, Dopamine; D017448:Receptors, Dopamine D2; D050637:Receptors, Dopamine D3; D015252:Deoxyribonucleases, Type II Site-Specific; C060616:TGGCCA-specific type II deoxyribonucleases