Genome Stability of Bacillus thuringiensis subsp. israelensis Isolates |
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Authors: | Jonas Ankarloo Dominique A. Caugant Bjarne M. Hansen Alexandra Berg Anne-Brit Kolstø Ann Lövgren |
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Affiliation: | (1) Department of Microbiology, Stockholm University, S-106 91 Stockholm, Sweden , SE;(2) Department of Bacteriology, National Institute of Public Health, P.O. Box 4404 Torshov, N-0403 Oslo, Norway , NO;(3) Department of Marine Ecology and Microbiology, National Environmental Research Institute, Frederiksborgvej 399, P.O. Box 358, DK-4000 Roskilde, Denmark , DK;(4) Department of Microbiology, Biotechnology Center of Oslo, University of Oslo, P.O. Box 1125 Blindern, N-0316 Oslo, Norway , NO |
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Abstract: | Swedish soil isolates biochemically classified as Bacillus thuringiensis subsp. israelensis were further examined for genetic diversity by multilocus enzyme electrophoresis (MLEE), random amplified polymorphic DNA analysis (RAPD), pulse field gel electrophoresis (PFGE), and Southern blotting, and were compared with reference strains. All the tested strains belonging to the Bt. israelensis serotype H14 were found to be identical, as judged from the RAPD analysis. MLEE analysis gave a similar result; only one H14 strain was found to differ from the remaining H14 strains by one null allele. PFGE analysis confirmed a very close relationship between the H14 strains but revealed an SfiI restriction fragment of variable size. Southern blot analyses were carried out with probes for the chromosomally encoded flagellin gene(s) and the plasmid-encoded mosquitocidal toxins. All probes gave similar hybridization patterns in the H14 strains. The mosquito toxin probes hybridized only to the H14 strains, except for one probe hybridizing to strain 6:3, which was originally isolated from the same soil sample as strains 6:11 and 6:12. Because the RAPD, MLEE, and PFGE analyses showed that strain 6:3 appears to be unrelated to strains 6:11 and 6:12, the presence of a mosquito toxin sequence in strain 6:3 may suggest that gene transfer has occurred. Received: 8 July 1999 / Accepted: 9 August 1999 |
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