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Journal of Clinical Microbiology, 12 1997, 3232-3239, Vol 35, No. 12
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Conditionally replicating luciferase reporter phages: improved susceptibility for rapid detection and assessment of drug susceptibility of Mycobacterium tuberculosis [In Process Citation]

C Carriere, PF Riska, O Zimhony, J Kriakov, S Bardarov, J Burns, J Chan and WR Jacobs Jr
Department of Microbiology and Immunology, Howard Hughes Medical Institute, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA.

TM4 is a lytic mycobacteriophage which infects mycobacteria of clinical importance. A luciferase reporter phage, phAE40, has been constructed from TM4 and was previously shown to be useful for the rapid detection and drug susceptibility testing of Mycobacterium tuberculosis. However, the lytic nature of the phage results in a loss of detectable light output and limits the sensitivity of detection. We describe several strategies aimed at improving the luciferase activity generated by TM4 luciferase phages, including (i) varying the position of the luciferase gene in the phage genome, (ii) isolating host-range mutants of the phage, and (iii) introducing temperature-sensitive mutations in the phage such that it will not replicate at the infecting temperature. Several new phages generated by these methods show increased intensity of luciferase production compared to the first-generation reporter phage phAE40, and one phage, phAE88, also demonstrates an enhanced duration of luciferase activity. This has allowed the detection of as few as 120 BCG cells and the determination of drug susceptibilities of M. tuberculosis in as little as 1 day.

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