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Journal of Clinical Microbiology, Feb 1995, 304-307, Vol 33, No. 2
C Guerrero, C Bernasconi, D Burki, T Bodmer and A Telenti
The insertion sequence IS1245 is a novel mycobacterial repetitive element
identified in Mycobacterium avium. It encodes a transposase which exhibits
a 64% amino acid similarity with IS1081, an insertion element present in
the M. tuberculosis complex. The host range of IS1245 appears limited to M.
avium as this element was not identified in M. intracellulare or in any
other of 18 mycobacteria species tested. When IS1245 was used for
restriction fragment length polymorphism (RFLP) analysis, human isolates
characteristically presented a high number of copies (median, 16; range, 3
to 27) and a diversity of RFLP patterns comparable to that found by
pulsed-field gel electrophoresis. Isolates from nonhuman sources differed
both in number of copies and in RFLP pattern diversity: while swine
isolates shared the characteristics of human strains, those from several
avian sources exhibited a very low copy number of IS1245 and appeared
clonal on the basis of RFLP.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
A novel insertion element from Mycobacterium avium, IS1245, is a specific target for analysis of strain relatedness
Institute for Medical Microbiology, University of Berne, Switzerland.
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