title: Association analysis of the genetic variants of the N-methyl D-aspartate receptor subunit 2b (NR2b) and treatment-refractory schizophrenia in the Chinese.
abstract: Several pieces of evidence showed that N-methyl D-aspartate (NMDA)-receptor-mediated decreases in function may be a causative factor for schizophrenia. The NMDA receptors are composed of a common glutamate receptor, an ionotropic NMDA 1 (GRIN1) subunit and one of four GRIN2 subunits (GRIN2A-GRIN2D), combined in an undetermined ratio to make up the receptor complex. In this study, we tested the hypothesis of whether the GRIN2B 366C/G and 2664C/T genetic polymorphisms are related to Chinese treatment-refractory schizophrenic patients. 193 treatment-refractory schizophrenic patients and 176 normal subjects were recruited for this study. The results demonstrated that the genotype distribution was similar between schizophrenic patients and control subjects in 366C/G (p = 0.88) and 2664C/T (p = 0.336), but we found a higher mean clozapine dosage in 2664C/C genotype patients. These results show that GRIN2B genetic variations were not a major risk factor for treatment-refractory schizophrenic patients, but may influence the effect of clozapine during treatment.
authors.affiliation: Institute of Public Health, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Hsien-Jane
authors.initials: HJ
authors.lastname: Chiu
authors.forename: Ying-Chieh
authors.initials: YC
authors.lastname: Wang
authors.forename: Ying-Jay
authors.initials: YJ
authors.lastname: Liou
authors.forename: I-Ching
authors.initials: IC
authors.lastname: Lai
authors.forename: Jen-Yeu
authors.initials: JY
authors.lastname: Chen
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000627:therapeutic use; D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D003024:Clozapine / Q000627:therapeutic use; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D016194:Receptors, N-Methyl-D-Aspartate / Q000235:genetics*; D012307:Risk Factors; D012559:Schizophrenia / Q000188:drug therapy / Q000235:genetics*
chemical_list: D014150:Antipsychotic Agents; C121001:NR2B NMDA receptor; D016194:Receptors, N-Methyl-D-Aspartate; D003024:Clozapine