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2004 JAN 21 - (NewsRx.com & NewsRx.net) -- A recA deletion mutant of Mycobacterium bovis BCG confers protection equivalent to that of wild-type BCG but shows increased genetic stability.
"The widely used vaccine against tuberculosis, BCG, shows evidence of genetic instability. It has undergone major genetic rearrangements resulting in deletion and duplication of segments of its chromosome. In order to produce a BCG strain with more favorable genetic properties, we inactivated the recA gene," scientists in Switzerland report.
"Targeted deletion of the recA gene of BCG resulted in a complete loss of recombination between homologous, chromosomally-located sequences, as well as between plasmid- and chromosomally-located sequences," stated Peter Sander and collaborators at the University of Zurich in Switzerland and the National Institute for Medical Research in England. "The Delta-recA mutant BCG was as effective as the wild-type in conferring protection in mice against an intravenous challenge with virulent Mycobacterium tuberculosis, indicating that the loss of an SOS response-mediated DNA repair mechanism did not compromise ...