title: [Association of TNFA polymorphisms with the outcomes of HBV infection].
abstract: OBJECTIVE
  To explore whether the TNFA promoter single nucleotide polymorphisms (SNPs) are associated with the outcomes of hepatitis B virus(HBV) infection in Chinese Han population.
  
  
  METHODS
  One hundred and forty-eight self-limited HBV infection subjects and 207 chronic hepatitis B patients were recruited. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and sequence specific primer-PCR(PCR-SSP) were used to detect the SNPs of five sites in TNFA promoter (-238G/A, -308G/A, -857C/T, -863C/A, -1031T/C). The frequency distributions of genotypes and haplotypes in different groups were analyzed by EPI and EH programs.
  
  
  RESULTS
  The frequencies of -238GG genotype in chronic hepatitis B patients were significantly higher than that in self-limited infection subjects (P=0.02). The frequencies of -857TT genotype in chronic hepatitis B patients were clearly lower than that in self-limited infection subjects (P=0.02). Haplotypic frequencies of GGCCT (-238/-308/-857/-863/-1031) in chronic hepatitis B patients was significantly lower than that in self-limited infection subjects (P=0.03), and the frequencies of haplotype GGCAT or GGTAT in chronic hepatitis B patients were clearly higher than those in self-limited infection subjects (P=0.0001; P=0.004).
  
  
  CONCLUSIONS
  TNFA promoter polymorphisms are important host genetic factors affecting the outcomes of HBV infection.
authors.affiliation: Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences; School of Basic Medicine, Peking Union Medical College, Beijing, 100005 PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Xin-hui
authors.initials: XH
authors.lastname: Guo
authors.forename: Te
authors.initials: T
authors.lastname: Du
authors.forename: Jun-hong
authors.initials: JH
authors.lastname: Li
authors.forename: Xi-lin
authors.initials: XL
authors.lastname: Zhu
authors.forename: Ji-rong
authors.initials: JR
authors.lastname: Gao
authors.forename: Liang-ping
authors.initials: LP
authors.lastname: Lu
authors.forename: Chun-yan
authors.initials: CY
authors.lastname: Gou
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Li
mesh_terms: D000328:Adult; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D006239:Haplotypes; D006509:Hepatitis B / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D055815:Young Adult
chemical_list: D014409:Tumor Necrosis Factor-alpha