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. 1994 Mar;68(3):1271–1282. doi: 10.1128/jvi.68.3.1271-1282.1994

Herpes simplex virus type 1 DNA replication and gene expression during explant-induced reactivation of latently infected murine sensory ganglia.

G B Devi-Rao 1, D C Bloom 1, J G Stevens 1, E K Wagner 1
PMCID: PMC236580  PMID: 8107193

Abstract

Infectious virus assays and PCR amplification of DNA and RNA were used to investigate herpes simplex virus DNA replication and gene expression in two murine in vitro models for virus reactivation. We examined latent infections with wild-type (wt), precisely defined latency-associated transcript-negative (LAT-) mutants, and LAT+ rescuants of these mutants of the 17syn+ strain of virus in both murine trigeminal and lumbosacral ganglia and of the KOS(M) strain in the latter. In explants of ganglia latently infected with the LAT- mutant of strain 17syn+ virus, a reduction in number of cultures exhibiting cytopathic effects due to virus reactivation and measurable delays in virus recovery were observed compared with wt or the LAT+ rescuant. This LAT-specific effect was not seen in explants of lumbosacral ganglia latently infected with mutants derived from the KOS(M) strain of virus. Although there was appreciable variation between individual animals, no significant difference between LAT+ and LAT- virus in time of onset of viral DNA replication in explanted ganglia was seen with use of either virus strain. There was a slight decrease in the relative amount of viral DNA recovered compared with internal cellular controls in latently infected ganglia harboring the LAT- mutant of 17syn+ compared with the wt virus or the LAT+ rescuant. This reduced relative amount ranged from 0 to as much as 50% but averaged 20%. Such differences were not seen in infections with KOS(M)-derived mutants. In contrast, although expression of productive-cycle transcripts could be detected within 4 h following explant cultivation of latently infected ganglia, no differences between LAT+ and LAT- viruses could be seen. As discussed, these data place specific constraints on possible models for the role of LAT expression in in vitro reactivation systems.

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