Molecular evidence for independent occurrence of IS6110 insertions at the same sites of the genome of Mycobacterium tuberculosis in different clinical isolates

被引:16
作者
Fang, Z [1 ]
Kenna, DT
Doig, C
Smittipat, DN
Palittapongarnpim, P
Watt, B
Forbes, KJ
机构
[1] Guys Kings & St Thomas Sch Med, Publ Hlth Lab, Serv Mycobacteria Reference Unit, London SE22 8QF, England
[2] Guys Kings & St Thomas Sch Med, Dept Infect, London SE22 8QF, England
[3] Univ Aberdeen, Dept Med Microbiol, Aberdeen, Scotland
[4] City Hosp, Scottish Mycobacteria Reference Lab, Edinburgh, Midlothian, Scotland
[5] Mahidol Univ, Dept Microbiol, Bangkok 10700, Thailand
关键词
D O I
10.1128/JB.183.18.5279-5284.2001
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Several characteristics of Mycobacterium tuberculosis (e.g., conserved genome and low growth rate) have severely restricted the study of the microorganism. The discovery of IS6110 raised hopes of overcoming these obstacles. However, our knowledge of this IS element is relatively limited; even its two basic characteristics (transposition mechanism and target site selection) are far from well understood. In this study, IS6110 insertions in ipl loci (iplA and iplB) in two collections of clinical isolates of M. tuberculosis from different geographic locations, one from Scotland and the other from Thailand, were investigated. Five different IS6110 insertions in the loci were identified: ipl-4::IS6110, ipl-5::IS6110, ipl-11::IS6110, ipl-12::IS6110, and ipl-13:: IS6110. An attempt to establish the phylogenetic relationship of the isolates containing these insertions was unsuccessful, suggesting that some of these insertions may have arisen from more than one event. This possibility is further supported by the observation that IS6110 copies existed in the same site but with different orientations in different isolates, and the insertion site of ipl-l::IS6110 harbored IS6110 copies in both iplA and iplB in different strains. All these suggest the independent occurrence of IS6110 insertions at the same sites of the genome of M. tuberculosis in different clinical isolates. The implications of this finding are discussed.
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页码:5279 / 5284
页数:6
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