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Unité de Génétique Moléculaire Bactérienne, Institut Pasteur, 28 Rue Dr Roux, 75724 Paris, Cedex 15, France
Hópital Ambroise Paré, 9 Avenue Chalres-de-Gaulle, 92104 Boulogne Cedex, France
The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, Cambridge CB 10 1SA, UK
Author for correspondence: Stewart T. Cole. Tel: +33 1 45 68 84 46. Fax: +33 1 40 61 35 83. e-mail: stcole@pasteur.fr
ABSTRACT
Summary: The genome sequence of Mycobacterium tuberculosis H37Rv was found to contain 56 loci with homology to insertion sequences (ISs). As well as the previously described IS6110, IS1081, IS1547 and IS-like elements, new ISs belonging to the IS3, IS5, IS21, IS30, IS110, IS256 and ISL3 families were identified. In addition, six ISs created a grouping of their own to form a new family (the IS1535 family). Elements with similarity to ISs in other actinomycetes were identified, suggesting the movement of ISs between related genera. The location of ISs on the chromosome revealed that an approximately 600 kb region close to the origin of replication lacks ISs, pointing to the possible detrimental effect of insertions in this area. Analysis of the distribution of ISs through the tubercle strains Mycobacterium africanum, M. microti, M. bovis, M. bovis BCG Pasteur, M. tuberculosis H37Ra, M. tuberculosis CSU#93 and 29 clinical isolates revealed that only IS1532, IS1533, IS1534, and IS1561 were absent from some of the strains tested. A novel repeated sequence, the REP13E12 family, is described that is present in seven copies on the M. tuberculosis H37Rv chromosome and which contains a probable phage attachment site. This study therefore offers an insight into the possible role of ISs and repetitive elements in the evolution of the M. tuberculosis genome, as well as identifying genetic markers that may be useful for phylogenetic and epidemiological analysis of the tubercle complex.
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