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Reverse Transcriptase-Mediated Tropism Switching in Bordetella Bacteriophage
Minghsun Liu,1Rajendar Deora,1*Sergei R. Doulatov,1*Mari Gingery,1Frederick A. Eiserling,1Andrew Preston,2Duncan J. Maskell,2Robert W. Simons,1Peggy A. Cotter,3Julian Parkhill,4Jeff F. Miller1
Host-pathogen interactions are often driven by mechanisms that
promote genetic variability. We have identified a group oftemperate
bacteriophages that generate diversity in a gene, designatedmtd (major tropism determinant), which specifies tropism for
receptormolecules on host Bordetella species. Tropism
switching is theresult of a template-dependent, reverse
transcriptase-mediatedprocess that introduces nucleotide
substitutions at defined locationswithin mtd. This
cassette-based mechanism is capable of providinga vast repertoire of
potential ligand-receptor interactions.
1 Department of Microbiology, Immunology and
Molecular Genetics, University of California, Los Angeles, Los Angeles,
CA 90095, USA.
2 Centre for Veterinary Science,
Department of Clinical Veterinary Medicine, University of Cambridge,
Cambridge CB3 OES, UK.
3 Department of Molecular,
Cellular and Developmental Biology, University of California, Santa
Barbara, Santa Barbara, CA 93106, USA.
4 The Sanger
Centre, The Wellcome Trust Genome Campus, Hixton, Cambridge, UK.
*
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail:
jfmiller{at}ucla.edu.
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