title: Case-control association study of 59 candidate genes reveals the DRD2 SNP rs6277 (C957T) as the only susceptibility factor for schizophrenia in the Bulgarian population.
abstract: The development of molecular psychiatry in the last few decades identified a number of candidate genes that could be associated with schizophrenia. A great number of studies often result with controversial and non-conclusive outputs. However, it was determined that each of the implicated candidates would independently have a minor effect on the susceptibility to that disease. Herein we report results from our replication study for association using 255 Bulgarian patients with schizophrenia and schizoaffective disorder and 556 Bulgarian healthy controls. We have selected from the literatures 202 single nucleotide polymorphisms (SNPs) in 59 candidate genes, which previously were implicated in disease susceptibility, and we have genotyped them. Of the 183 SNPs successfully genotyped, only 1 SNP, rs6277 (C957T) in the DRD2 gene (P=0.0010, odds ratio=1.76), was considered to be significantly associated with schizophrenia after the replication study using independent sample sets. Our findings support one of the most widely considered hypotheses for schizophrenia etiology, the dopaminergic hypothesis.
authors.affiliation: Laboratory for Cardiovascular Diseases, SNP Research Center, The Institute of Physical and Chemical Research (RIKEN), Tokyo, Japan.
authors.forename: Elitza T
authors.initials: ET
authors.lastname: Betcheva
authors.forename: Taisei
authors.initials: T
authors.lastname: Mushiroda
authors.forename: Atsushi
authors.initials: A
authors.lastname: Takahashi
authors.forename: Michiaki
authors.initials: M
authors.lastname: Kubo
authors.forename: Sena K
authors.initials: SK
authors.lastname: Karachanak
authors.forename: Irina T
authors.initials: IT
authors.lastname: Zaharieva
authors.forename: Radoslava V
authors.initials: RV
authors.lastname: Vazharova
authors.forename: Ivanka I
authors.initials: II
authors.lastname: Dimova
authors.forename: Vihra K
authors.initials: VK
authors.lastname: Milanova
authors.forename: Todor
authors.initials: T
authors.lastname: Tolev
authors.forename: George
authors.initials: G
authors.lastname: Kirov
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Owen
authors.forename: Michael C
authors.initials: MC
authors.lastname: O'Donovan
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Kamatani
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Draga I
authors.initials: DI
authors.lastname: Toncheva
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002031:Bulgaria; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D017448:Receptors, Dopamine D2 / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*; D044465:White People / Q000235:genetics*
chemical_list: D017448:Receptors, Dopamine D2