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Chinese Journal of Antituberculosis ›› 2009, Vol. 31 ›› Issue (2): 80-84.

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The application of mycobacterial interspersed repetitive unit(MIRU) in M.tuberculosis genotying

Guo Yanling1, Liu Yang,Wang Sumin, Li Chuanyou, Song Changxing   

  1. 1.Beijing tuberculosis and thoracic tumor research institute, Beijing 101149, China; 2.Beijing institute of tuberculosis control, Beijing 100035
  • Online:2009-02-10 Published:2011-11-03

Abstract: Objective To assess the application of mycobacterial interspersed repetitive unit(MIRU) in the epidemiology of tuberculosis, and to discuss its prospect. Method158 Mycobacterium tuberculosis isolates that had been typed by IS6110-RFLP were subjected to MIRU. ResultsThe Results were obtained by MIRU within 1 day. 105 patterns were produced, in which 65 patterns were unique. In MIRU loci, there were four loci(loci 4,10,26,40) with higher diversity. MIRU typing provided discrimination (Hunter-Gaston Index [HGI] of 0.978) compared with the IS6110 RFLP method (HGI=0.994). For those strains lower than 10 copies, MIRU typing provided discrimination (HGI=0.982) comparable to that of the RFLP method (HGI=0.98). ConclusionMIRU typing, which is simple, rapid, and easy to popularize, would exert important function in the epidemiological investigation of tuberculosis.

Key words: Mycobacterium tuberculosis, MIRU, IS6110, RFLP