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Journal of Virology, June 1999, p. 4705-4712, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Phenotypic Consequences of Rearranging the P, M,
and G Genes of Vesicular Stomatitis Virus
L. Andrew
Ball,1,*
Craig R.
Pringle,2
Brian
Flanagan,1
Victoria P.
Perepelitsa,1 and
Gail
W.
Wertz1
Department of Microbiology, University of
Alabama at Birmingham, Birmingham, Alabama
35294,1 and Department of Biological
Sciences, University of Warwick, Coventry CV4 7AL,
England2
Received 8 February 1999/Accepted 9 March 1999
The nonsegmented negative-strand RNA viruses (order
Mononegavirales) include many important human pathogens.
The order of their genes, which is highly conserved, is the major
determinant of the relative levels of gene expression, since genes that
are close to the single promoter site at the 3' end of the viral genome are transcribed at higher levels than those that occupy more distal positions. We manipulated an infectious cDNA clone of the prototypic vesicular stomatitis virus (VSV) to rearrange three of the five viral
genes, using an approach which left the viral nucleotide sequence
otherwise unaltered. The central three genes in the gene order, which
encode the phosphoprotein P, the matrix protein M, and the glycoprotein
G, were rearranged into all six possible orders. Viable viruses were
recovered from each of the rearranged cDNAs. The recovered viruses were
examined for their levels of gene expression, growth potential in cell
culture, and virulence in mice. Gene rearrangement changed the
expression levels of the encoded proteins in concordance with their
distance from the 3' promoter. Some of the viruses with rearranged
genomes replicated as well or slightly better than wild-type
virus in cultured cells, while others showed decreased replication. All
of the viruses were lethal for mice, although the time to symptoms and
death following inoculation varied. These data show that despite the highly conserved gene order of the Mononegavirales, gene
rearrangement is not lethal or necessarily even detrimental to the
virus. These findings suggest that the conservation of the gene order
observed among the Mononegavirales may result from
immobilization of the ancestral gene order due to the lack of a
mechanism for homologous recombination in this group of viruses. As a
consequence, gene rearrangement should be irreversible and provide an
approach for constructing viruses with novel phenotypes.
*
Corresponding author. Mailing address: Microbiology
Department, UAB, BBRB 373/17, 845 19th St. South, Birmingham, AL 35294. Phone: (205) 934-0864. Fax: (205) 934-1636. E-mail:
Andyb{at}uab.edu.
Journal of Virology, June 1999, p. 4705-4712, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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