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J. Virol., Mar 1996, 1969-1980, Vol 70, No. 3
SL Uprichard and DM Knipe
Herpes simplex virus type 1 mutants with certain lesions in the ICP27 gene
show a 5- to 10-fold reduction in viral DNA synthesis. To determine how
ICP27 promotes amplification of viral DNA, we examined the synthesis,
accumulation, and stability of the essential viral replication proteins and
steady-state levels of the replication gene transcripts throughout the
course of ICP27 mutant virus infections. These studies reveal that in the
absence of ICP27, expression of the UL5, UL8, UL52, UL9, UL42, and UL30
genes is significantly reduced at the level of mRNA accumulation. In
contrast to that of these beta genes, ICP8 expression is unaltered in
mutant virus-infected cells, indicating that ICP27 selectively stimulates
only a subset of herpes simplex virus beta genes. Analysis of multiple
ICP27 mutant viruses indicates a quantitative correlation between the
ability of these mutants to replicate viral DNA and the level of
replication proteins produced by each mutant. Therefore, we conclude that
the primary defect responsible for restricted viral DNA synthesis in cells
infected with ICP27 mutants is insufficient expression of most of the
essential replication genes. Of further interest, this analysis also
provides new information about the structure of the UL52 gene transcripts.
Copyright © 1996, American Society for Microbiology
Herpes simplex ICP27 mutant viruses exhibit reduced expression of specific DNA replication genes
Harvard Medical School, Boston, Massachusetts 02115, USA.
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