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Journal of Virology, September 2004, p. 9837-9841, Vol. 78, No. 18
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.18.9837-9841.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Fitness Analyses of Vesicular Stomatitis Strains with Rearranged Genomes Reveal Replicative Disadvantages

Isabel S. Novella,1* L. Andrew Ball,2 and Gail W. Wertz2

Department of Microbiology and Immunology, Medical College of Ohio, Toledo, Ohio,1 Department of Microbiology, University of Alabama School of Medicine, Birmingham, Alabama2

Received 25 January 2004/ Accepted 12 May 2004

Gene expression of the nonsegmented negative-strand RNA viruses is determined by the position of each gene relative to that the single 3' promoter. The general order of genes among all of the viruses of the order Mononegavirales is highly conserved. In previous work we generated recombinant viruses in which the order of the three central genes of the prototypical rhabdovirus, vesicular stomatitis virus, was rearranged to all six possible permutations. While some of these viruses replicated less well than the wild type when assayed by single-step growth analyses in BSC-1 cells, others replicated as well or slightly better. In the work reported here, we used competition assays to compare the fitness of the viruses with alternative gene orders to that of the wild-type (wt) virus. We found that the relative fitness of these recombinant viruses depended on the multiplicity of infection (MOI) but not on the population size. However, during competitions at low MOI, when complementation cannot compensate for the defects of the populations with rearranged genomes, the virus with the wt gene order was always the most fit.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Medical College of Ohio, 3055 Arlington Ave., Toledo, OH 43614. Phone: (419) 383-6442. Fax: (419) 383-3002. E-mail: isabel{at}mco.edu.

Journal of Virology, September 2004, p. 9837-9841, Vol. 78, No. 18
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.18.9837-9841.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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