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Infection and Immunity, November 1999, p. 5768-5774, Vol. 67, No. 11
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Genomic Analysis Reveals Variation between Mycobacterium tuberculosis H37Rv and the Attenuated M. tuberculosis H37Ra Strain

Roland Brosch,1 Wolfgang J. Philipp,1,dagger Evangelos Stavropoulos,2 M. Joseph Colston,2 Stewart T. Cole,1 and Stephen V. Gordon1,2,*

Unité de Génétique Moléculaire Bactérienne, Institut Pasteur, 75724 Paris, Cedex 15, France,1 and Division of Mycobacterial Research, National Institute for Medical Research, London NW7 1AA, United Kingdom2

Received 11 May 1999/Returned for modification 23 June 1999/Accepted 16 August 1999

Mycobacterium tuberculosis H37Ra is an attenuated tubercle bacillus closely related to the virulent type strain M. tuberculosis H37Rv. Despite extensive study, the reason for the decreased virulence of M. tuberculosis H37Ra has not been determined. A genomic approach was therefore initiated to identify genetic differences between M. tuberculosis H37Rv and M. tuberculosis H37Ra as a means of pinpointing the attenuating mutation(s). Digestion with the rare-cutting restriction endonuclease DraI revealed two polymorphisms between the strains: a 480-kb fragment in M. tuberculosis H37Rv was replaced by two fragments of 220 and 260 kb in M. tuberculosis H37Ra, while there was a ~7.9-kb DraI fragment in M. tuberculosis H37Ra that had no counterpart in M. tuberculosis H37Rv. As the M. tuberculosis insertion sequence IS6110 contains a single DraI restriction site, it was considered possible that these polymorphisms were the result of IS6110 transposition events in M. tuberculosis H37Ra, events that may have inactivated virulence genes. The 7.9-kb polymorphism was found to be due to the presence of the previously described H37Rv RvD2 deletion in M. tuberculosis H37Ra, with sequence analysis suggesting an IS6110-mediated deletion mechanism for loss of RvD2. Three other IS6110-catalyzed deletions from the M. tuberculosis H37Rv chromosome (RvD3 to RvD5) were also identified, suggesting that this mechanism plays an important role in genome plasticity in the tubercle bacilli. Comparative mapping and sequencing revealed that the 480-kb polymorphism was due to an IS6110 insertion in M. tuberculosis H37Ra near oriC. Complementation of M. tuberculosis H37Ra with a 2.9-kb restriction fragment from M. tuberculosis H37Rv that encompassed the IS6110 insertion did not increase the survival of recombinant M. tuberculosis H37Ra in mice. In conclusion, this study describes the presence and mechanisms of genomic variation between M. tuberculosis H37Ra and M. tuberculosis H37Rv, although the role that they play in the attenuation of M. tuberculosis H37Ra is unclear.

* Corresponding author. Present address: Veterinary Laboratories Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, United Kingdom. Phone: 44 (01932) 357860. Fax: 44 (01932) 357684. E-mail: ap75{at}gtnet.gov.uk.

dagger Present address: Department of Microbiology, Biozentrum, University of Basle, Basel, Switzerland.

Infection and Immunity, November 1999, p. 5768-5774, Vol. 67, No. 11
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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