title: [Association of the polymorphisms in the promoter region of tumor necrosis factor alpha and interleukin 6 genes with schizophrenia].
abstract: OBJECTIVE
  To investigate the relationship between the -308G/A, -857C/T and -1031T/C of tumor necrosis factor alpha gene (TNF- alpha), -174G/C and -572C/G of interleukin-6 gene (IL-6) polymorphisms and schizophrenia.
  
  
  METHODS
  Genomic DNA was isolated from the venous blood leukocytes of 346 unrelated patients with schizophrenia and 323 healthy unrelated individuals (control group). All of the polymorphisms were genotyped by PCR-restriction fragment length polymorphisms (PCR-RFLP). Genotype and allele frequencies were analyzed by SPSS13.0 software.
  
  
  RESULTS
  There were significant differences in both allele and genotype frequencies of -857C/T of TNF-alpha gene between the schizophrenia and control groups (P< 0.05). The allele T of -857C/T in schizophrenia group was significantly higher than that in control group (chi-square was 9.414, P=0.002, OR=1.511, 95%CI:1.160-1.969). In addition, there were significant differences in the positive and negative syndrome scale (PANSS) total score and negative symptoms between the patients with different -857C/T genotypes, and the negative symptom score of TT genotype was significantly higher than that of CC genotype (P<0.05).
  
  
  CONCLUSIONS
  There is an association between -857C/T of TNF-alpha gene and schizophrenia, individuals with T allele of -857C/T are susceptible to schizophrenia, and there is an association between -857C/T and negative symptom score.
authors.affiliation: Key Laboratory of Reproduction and Genetics in Ningxia, Department of Medical Genetics and Cell Biology, Ningxia Medical University, Yinchuan, Ningxia 750004, P. R. China.
authors.forename: Hui-jun
authors.initials: HJ
authors.lastname: Zhong
authors.forename: Liang
authors.initials: L
authors.lastname: Peng
authors.forename: Yong-sheng
authors.initials: YS
authors.lastname: Zhu
authors.forename: Jie
authors.initials: J
authors.lastname: Dang
authors.forename: Zheng-hao
authors.initials: ZH
authors.lastname: Huo
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D015850:Interleukin-6 / Q000235:genetics*; D008297:Male; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D011401:Promoter Regions, Genetic / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D055815:Young Adult
chemical_list: D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha