title: Comparative genomic analysis of gene variations of two Chinese Yersinia pestis isolates from vaccine strain EV76.
abstract: OBJECTIVE
  To investigate genomic variations of two Chinese Yersinia pestis isolates that were isolated from different plague foci obtained from vaccine strain EV76 from the Yunnan province of China.
  
  
  METHODS
  A microarray containing 12 000 probes covering the entire genome of seven Yersinia pestis and two Yersinia pseudotuberculosis strains, was used. PCR assays were performed to confirm microarray results.
  
  
  RESULTS
  The gene variations detected included the absence of five genes related to the synthesis of betaine in both EV76 and another sequenced attenuated strain, KIM D27. Several genes related to phage-related membrane proteins were found to be absent in the Antiqua biovar Yunnan strain, 485, which was isolated from a rodent plague foci.
  
  
  CONCLUSIONS
  These findings provide initial insight into the distinct strains isolated from natural foci, within their genomic context, including Yunnan Y. pestis strains. This information will be used therefore to establish subsequent comparisons of these sequences with published complete genomes of other strains.
authors.affiliation: State key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
authors.forename: Yuan Hai
authors.initials: YH
authors.lastname: You
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Yan Hua
authors.initials: YH
authors.lastname: Wang
authors.forename: Mao Jun
authors.initials: MJ
authors.lastname: Zhang
authors.forename: Zhi Zhong
authors.initials: ZZ
authors.lastname: Song
authors.forename: Rong
authors.initials: R
authors.lastname: Hai
authors.forename: Dong Zheng
authors.initials: DZ
authors.lastname: Yu
authors.forename: Hai Bin
authors.initials: HB
authors.lastname: Wang
authors.forename: Xing Qi
authors.initials: XQ
authors.lastname: Dong
authors.forename: Jian Zhong
authors.initials: JZ
authors.lastname: Zhang
mesh_terms: D002681:China; D055028:Comparative Genomic Hybridization / Q000379:methods*; D016680:Genome, Bacterial / Q000235:genetics; D016133:Polymerase Chain Reaction; D015010:Yersinia pestis / Q000235:genetics*