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J. Virol., 03 1995, 1389-1399, Vol 69, No. 3
MF Kramer and DM Coen
Herpes simplex virus establishes latency in nervous tissue in which it is
maintained for the life of the mammalian host, with occasional reactivation
leading to subsequent spread. Latency-associated transcripts are abundant
during latency, but viral proteins and productive cycle RNAs have not been
detected. Using sensitive, quantitative PCR assays, we have quantified
certain viral RNAs specific to productive-cycle genes in mouse ganglia
latently infected with herpes simplex virus type 1. Sense-strand RNA
specific to the essential immediate-early gene, ICP4, was present in most
ganglia in variable amounts relative to the amount of viral DNA, with one
to seven molecules of RNA per viral genome in about 20% of ganglia. In
contrast, the amount of latency-associated transcripts was much less
variable, at an average of 4 x 10(4) molecules per viral genome. The
amounts of ICP4- specific RNA were similar at 30 and 60 days postinfection,
and at least some of these transcripts initiated within a region consistent
with utilization of the ICP4 promoter. RNA specific to the thymidine kinase
gene, whose transcription in productive infection is dependent on ICP4, was
present in latently infected ganglia at a maximum level of 3.2 x 10(6)
molecules per ganglion (500 molecules per viral genome). ICP4- specific and
tk-specific RNAs measured from the same samples showed a positive
correlation extending over 2 orders of magnitude. We conclude that
ICP4-specific RNA is expressed in the absence of detectable reactivation
and discuss possible implications of our findings for latent gene
expression.
Copyright © 1995, American Society for Microbiology
Quantification of transcripts from the ICP4 and thymidine kinase genes in mouse ganglia latently infected with herpes simplex virus
Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.
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