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Clinical Microbiology Reviews, Jul 1997, 419-443, Vol 10, No. 3
EK Wagner and DC Bloom
The clinical manifestations of herpes simplex virus infection generally
involve a mild and localized primary infection followed by asymptomatic
(latent) infection interrupted sporadically by periods of recrudescence
(reactivation) where virus replication and associated cytopathologic
findings are manifest at the site of initial infection. During the latent
phase of infection, viral genomes, but not infectious virus itself, can be
detected in sensory and autonomic neurons. The process of latent infection
and reactivation has been subject to continuing investigation in animal
models and, more recently, in cultured cells. The initiation and
maintenance of latent infection in neurons are apparently passive phenomena
in that no virus gene products need be expressed or are required. Despite
this, a single latency-associated transcript (LAT) encoded by DNA
encompassing about 6% of the viral genome is expressed during latent
infection in a minority of neurons containing viral DNA. This transcript is
spliced, and the intron derived from this splicing is stably maintained in
the nucleus of neurons expressing it. Reactivation, which can be induced by
stress and assayed in several animal models, is facilitated by the
expression of LAT. Although the mechanism of action of LAT-mediated
facilitation of reactivation is not clear, all available evidence argues
against its involving the expression of a protein. Rather, the most
consistent models of action involve LAT expression playing a cis-acting
role in a very early stage of the reactivation process.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Experimental investigation of herpes simplex virus latency
Department of Molecular Biology and Biochemistry, University of California, Irvine 92697-3900, USA. Ewagner@uci.edu
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