title: No association of tumor necrosis factor alpha gene polymorphisms with schizophrenia or response to clozapine.
abstract: Tumor necrosis factor alpha (TNF-alpha), a potent immunomodulator and proinflammatory cytokine, has been implicated in schizophrenia pathogenesis and clozapine response. Two studies have established an association between schizophrenia and the TNF-alpha gene -308G/A polymorphism; however, both increased and decreased -308A allele frequency have been reported in two analogous investigations. The present study examined the hypothesis that the TNF-alpha gene -308G/A polymorphism confers susceptibility to schizophrenia in 205 patients with schizophrenia compared with 192 controls. A subgroup of 99 clozapine-treated schizophrenia patients was also tested for the genetic effects of this polymorphism, as evidenced by clinical manifestation, and clozapine-related therapeutic outcome and body-weight change. The results of these investigations suggest that the TNF-alpha gene -308G/A variants do not play a major role in susceptibility to, clinical manifestations for, or clozapine response in, schizophrenia.
authors: Department of Psychiatry, Veterans General Hospital-Taipei, Taipei, Taiwan, ROC. sjtsai@vghtpe.gov.tw
authors: Shih-Jen
authors: SJ
authors: Tsai
authors: Chen-Jee
authors: CJ
authors: Hong
authors: Younger W-Y
authors: YW
authors: Yu
authors: Ching-Hua
authors: CH
authors: Lin
authors: Ling-Ling
authors: LL
authors: Liu
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D001835:Body Weight / Q000187:drug effects; D003024:Clozapine / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics*; D011569:Psychiatric Status Rating Scales; D012559:Schizophrenia / Q000188:drug therapy* / Q000235:genetics*; D012565:Schizophrenic Psychology; D016896:Treatment Outcome; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
chemical_list: D014150:Antipsychotic Agents; D014409:Tumor Necrosis Factor-alpha; D003024:Clozapine