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J. Virol., Jan 1996, 165-171, Vol 70, No. 1
K Tsung, JH Yim, W Marti, RM Buller and JA Norton
Induction of the cytopathic effect (CPE) in cells infected with poxvirus
seems ubiquitous in that it has been associated with all different strains
and preparations of poxviruses, regardless of the replicating status of
these viruses. The study of the mechanisms by which CPE is induced by
nonreplicating poxviruses is hampered by the lack of any noncytopathic
mutant strains and preparations. In this paper, we report on the patterns
of gene expression and induction of CPE by vaccinia viruses treated by
limited cross-linking with psoralen and long-wave UV light (PLWUV). We show
that treatment of cell-free virus with PLWUV could inactivate viral
replication without abolishing the ability of the virus to infect cells.
Viral transcription as indicated by reporter genes was generally enhanced
and prolonged under early viral promoters and abolished under late
promoters. Furthermore, increasing the levels of cross-linking with PLWUV
resulted in a decrease and abolishment of viral expression of a large
reporter gene and a concomitant loss of the induction of CPE. Cells
infected with such a virus were able to express the reporter genes and
proliferate. The generation of nonreplicating and noncytopathic recombinant
vaccinia viruses may help in studies of the mechanisms of CPE induction by
poxvirus and may facilitate the use of poxviral vectors in broader areas of
research and clinical applications.
Copyright © 1996, American Society for Microbiology
Gene expression and cytopathic effect of vaccinia virus inactivated by psoralen and long-wave UV light
Department of Surgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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