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

Z. Fang, D. T. Kenna, C. Doig, D. N. Smittipat, P. Palittapongarnpim, B. Watt, Kenneth James Forbes

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5279-5284
Number of pages5
JournalJournal of Bacteriology
Volume183
DOIs
Publication statusPublished - 2001

Keywords

  • ESCHERICHIA-COLI
  • COMPLEX STRAINS
  • DNA-SEQUENCES
  • POLYMORPHISM
  • ELEMENTS
  • GENE
  • TRANSPOSITION
  • EPIDEMIOLOGY
  • RESTRICTION
  • ASSOCIATION

Cite this

Molecular evidence for independent occurrence of IS6110 insertions at the same sites of the genome of Mycobacterium tuberculosis in different clinical isolates. / Fang, Z.; Kenna, D. T.; Doig, C.; Smittipat, D. N.; Palittapongarnpim, P.; Watt, B.; Forbes, Kenneth James.

In: Journal of Bacteriology, Vol. 183, 2001, p. 5279-5284.

Research output: Contribution to journalArticle

Fang, Z. ; Kenna, D. T. ; Doig, C. ; Smittipat, D. N. ; Palittapongarnpim, P. ; Watt, B. ; Forbes, Kenneth James. / Molecular evidence for independent occurrence of IS6110 insertions at the same sites of the genome of Mycobacterium tuberculosis in different clinical isolates. In: Journal of Bacteriology. 2001 ; Vol. 183. pp. 5279-5284.
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AU - Forbes, Kenneth James

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