title: Single nucleotide polymorphism in DNMT3B promoter and the risk for idiopathic thrombocytopenic purpura in Chinese population.
abstract: OBJECTIVE
  Epigenetic changes in gene expression, including DNA methylation and histone modifications, might contribute to autoimmunity. DNA methylation is mediated by a family of DNA methyltransferases. Polymorphisms of the DNA methyltransferase 3B (DNMT3B) gene may influence DNMT3B activity on DNA methylation, thereby modulating the susceptibility to some diseases. The purpose of this study was to investigate the association between the single nucleotide polymorphism (SNP) in promoter of the DNMT3B gene and the risk for development of idiopathic thrombocytopenic purpura (ITP).
  
  
  METHODS
  In this hospital-based case-control study, the DNMT3B SNP was genotyped in 201 patients with ITP and 136 healthy controls by polymerase chain reaction-restriction fragment length polymorphism.
  
  
  RESULTS
  The C/C genotype was not detected in both the patients with ITP and the controls. In the controls, the frequencies of T/T and C/T genotypes and T and C alleles were 97.8%, 2.2%, 98.9%, and 1.1%, respectively. There was no significant difference in genotype and allele distribution between the patients with ITP and the controls (P = 0.745 and 0.747, respectively). No significant difference was observed in genotype and allele distribution between the two groups when stratified by the age. The similar results were shown among the four groups of patients with ITP: acute childhood, chronic childhood, acute adult, and chronic adult.
  
  
  CONCLUSIONS
  This polymorphism was distributed similarly between the patients with ITP and the controls. It demonstrated that it may not be used as a stratification marker to predict the susceptibility to ITP, at least in the population of North China.
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 288 Nanjing Road, Tianjin 300020, People's Republic of China.
authors.forename: Zhenping
authors.initials: Z
authors.lastname: Chen
authors.forename: Zeping
authors.initials: Z
authors.lastname: Zhou
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Chen
authors.forename: Jianhui
authors.initials: J
authors.lastname: Xu
authors.forename: Aijuan
authors.initials: A
authors.lastname: Liu
authors.forename: Weiting
authors.initials: W
authors.lastname: Du
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Gu
authors.forename: Jing
authors.initials: J
authors.lastname: Ge
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Guo
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Wang
authors.forename: Xunwei
authors.initials: X
authors.lastname: Dong
authors.forename: Qian
authors.initials: Q
authors.lastname: Ren
authors.forename: Renchi
authors.initials: R
authors.lastname: Yang
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D044466:Asian People; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D002681:China; D002908:Chronic Disease; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000235:genetics* / Q000276:immunology; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000276:immunology; D011401:Promoter Regions, Genetic / Q000235:genetics* / Q000276:immunology; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000453:epidemiology / Q000235:genetics*; D000097584:DNA Methyltransferase 3B
chemical_list: D004248:DNA (Cytosine-5-)-Methyltransferases; D000097584:DNA Methyltransferase 3B