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Molecular Genetics and Immunobiology of Mycobacteria |
Dept of Microbiology and Immunology1 and Howard Hughes Medical Institute2, Albert Einstein College of Medicine, Bronx, NY 10461, USA
Division of Infectious Diseases, Department of Medicine, Montefiore Medical Center, Bronx, NY, USA3
Department of Microbiology and Immunology, University of Rochester Medical Center, 601 Elmwood Ave., Rochester, NY 14642, USA4
Department of Biological Sciences, Bacteriophage Institute, University of Pittsburgh, 365A Crawford Hall, Pittsburgh, PA 15260, USA5
Author for correspondence: William R. Jacobs, Jr. Tel: +1 718 430 2888. Fax: +1 718 430 8844. e-mail: jacobsw{at}hhmi.org
The authors have developed a simple and highly efficient system for generating allelic exchanges in both fast- and slow-growing mycobacteria. In this procedure a gene of interest, disrupted by a selectable marker, is cloned into a conditionally replicating (temperature-sensitive) shuttle phasmid to generate a specialized transducing mycobacteriophage. The temperature-sensitive mutations in the mycobacteriophage genome permit replication at the permissive temperature of 30 °C but prevent replication at the non-permissive temperature of 37 °C. Transduction at a non-permissive temperature results in highly efficient delivery of the recombination substrate to virtually all cells in the recipient population. The deletion mutations in the targeted genes are marked with antibiotic-resistance genes that are flanked by 
-res (resolvase recognition target) sites. The transductants which have undergone a homologous recombination event can be conveniently selected on antibiotic-containing media. To demonstrate the utility of this genetic system seven different targeted gene disruptions were generated in three substrains of Mycobacterium bovis BCG, three strains of Mycobacterium tuberculosis, and Mycobacterium smegmatis. Mutants in the lysA, nadBC, panC, panCD, leuCD, Rv3291c and Rv0867c genes or operons were isolated as antibiotic-resistant (and in some cases auxotrophic) transductants. Using a plasmid encoding the -resolvase (tnpR), the resistance genes could be removed, generating unmarked deletion mutations. It is concluded from the high frequency of allelic exchange events observed in this study that specialized transduction is a very efficient technique for genetic manipulation of mycobacteria and is a method of choice for constructing isogenic strains of M. tuberculosis, BCG or M. smegmatis which differ by defined mutations.
Keywords: mycobacteriophage, homologous recombination, allelic exchange
Abbreviations: AES, allelic exchange substrate; MCS, multiple cloning site
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