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Journal of Bacteriology, November 2003, p. 6467-6471, Vol. 185, No. 21
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.21.6467-6471.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Prophage Contribution to Bacterial Population Dynamics

Lionello Bossi,1 Juan A. Fuentes,{dagger} Guido Mora,{dagger} and Nara Figueroa-Bossi*

Centre de Génétique Moléculaire, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France

Received 13 May 2003/ Accepted 12 August 2003

Cocultures of Salmonella strains carrying or lacking specific prophages undergo swift composition changes as a result of phage-mediated killing of sensitive bacteria and lysogenic conversion of survivors. Thus, spontaneous prophage induction in a few lysogenic cells enhances the competitive fitness of the lysogen population as a whole, setting a selection regime that forces maintenance and spread of viral DNA. This is likely to account for the profusion of prophage sequences in bacterial genomes and may contribute to the evolutionary success of certain phylogenetic lineages.

* Corresponding author. Mailing address: Centre de Génétique Moléculaire, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette Cedex, France. Phone: 33 1 69 82 38 11. Fax: 33 1 69 82 38 77. E-mail: figueroa{at}cgm.cnrs-gif.fr.

{dagger} Permanent address: Departamento de Genetica Molecular y Microbiologia, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Santiago, Chile.

Journal of Bacteriology, November 2003, p. 6467-6471, Vol. 185, No. 21
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.21.6467-6471.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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