title: [Analysis on the polymorphisms of human B cell epitopes of 5 specificity antigens in Mycobacterium tuberculosis in China].
abstract: OBJECTIVE
  To study the diversities of human B cell epitopes of five proteins (Mpt83, Mpt70, LpqH, PstS3, GroES) in Mycobacterium tuberculosis isolates from China.
  
  
  METHODS
  We selected 179 strains isolated from patients with tuberculosis in different regions of China, and cultured these strains by L-J medium. The gene sequences of these 5 proteins were amplified and sequenced by PCR. The variations (single nucleotide polymorphisms, SNP) of the DNA sequences were compared and analyzed according to the immune epitope database (IEDB). The synonymous mutation rate (dS), non-synonymous mutation rate (dN) and dN/dS values were calculated with MEGA6 software.
  
  
  RESULTS
  Among the 179 clinical MTBC isolates, 7 SNP mutations were found in the mpt83gene. The dN/dS value of the whole mpt83 gene was 0.88. One SNP mutation was found in the mpt70 gene. The dN/dS values of the whole pstS3 gene and non-B epitopes areas were 1.74 and 1.40 respectively. But no mutation was found in the groES gene.
  
  
  CONCLUSIONS
  The mpt83, lpqH and pstS3 genes of 179 MTBC strains contain gene SNPs and human B cell epitopes diversities, while the coding gene and human B cell epitopes of protein mpt70 and groES were conservative.
authors.affiliation: Institute of Pathogenic Biology, University of South China, Hunan, 421000, China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Xu
authors.forename: M C
authors.initials: MC
authors.lastname: Li
authors.forename: S S
authors.initials: SS
authors.lastname: Chen
authors.forename: S Q
authors.initials: SQ
authors.lastname: Xiao
authors.forename: H C
authors.initials: HC
authors.lastname: Liu
authors.forename: X Q
authors.initials: XQ
authors.lastname: Zhao
authors.forename: Y M
authors.initials: YM
authors.lastname: Wu
authors.forename: K L
authors.initials: KL
authors.lastname: Wan
mesh_terms: D000942:Antigens, Bacterial / Q000235:genetics*; D002681:China; D018985:Epitopes, B-Lymphocyte / Q000235:genetics*; D006801:Humans; D059645:Mutation Rate; D009169:Mycobacterium tuberculosis; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide; D014376:Tuberculosis
chemical_list: D000942:Antigens, Bacterial; D018985:Epitopes, B-Lymphocyte