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J. Virol., 08 1997, 5885-5893, Vol 71, No. 8
DA Garber, PA Schaffer and DM Knipe
Herpes simplex virus (HSV) persists in the human population by establishing
long-term latent infections followed by periodic reactivation and
transmission. Latent infection of sensory neurons is characterized by
repression of viral productive-cycle gene expression, with abundant
transcription limited to a single locus that encodes the latency-associated
transcripts (LATs). We have observed that LAT- deletion mutant viruses
express viral productive-cycle genes in greater numbers of murine
trigeminal ganglion neurons than LAT+ HSV type 1 at early times during
acute infection but show reduced reactivation from latent infection. Thus,
a viral function associated with the LAT region exerts an effect at an
early stage of neuronal infection to reduce productive-cycle viral gene
expression. These results provide the first evidence that the virus plays
an active role in down-regulating productive infection during acute
infection of sensory neurons. The effect of down-regulation of
productive-cycle gene expression during acute infection may contribute to
viral evasion from the host immune responses and to reduced cytopathic
effects, thereby facilitating neuronal survival and the establishment of
latency.
Copyright © 1997, American Society for Microbiology
A LAT-associated function reduces productive-cycle gene expression during acute infection of murine sensory neurons with herpes simplex virus type 1
Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.
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