1887

Abstract

The development of herpes simplex virus as a vector for neuronal gene delivery is dependent upon the identification and characterization of promoter elements capable of driving long-term expressio nduring latency. The majority of RNA polymerase II (pol II) promoters studied are active during acute infection but silenced during latency. In order to investigate the potential of a murine RNA polymerase I (pol I) promoter to drive reporter gene expressio nduring lytic and latent infection, we describe the construction and characterization of two recombinant viruses; SC16 LAT neo and SC16 US5 neo. These viruses contain a pol I-encephalomyocarditis virus internal ribosome entry site (EMCV IRES)-neomycin phosphotransferase gene ( ) cassette inserted into the non-essential major latency associated transcript (LAT) and US5 regions respectively. Pol I promoter activity could be detected in the rodent BHK cell line, but not the primate derived Vero cell line — consistent with the known species specificity of such promoters. This activity was specific to a virus containing an active pol I promoter. However, hybridization analyses of latently infected cervical dorsal root ganglia failed to detect pol I mediated transcription of the reporter gene indicating that the murine pol I promoter is silenced following the establishment of latency. Insertion of the pol I-EMCV IRES- cassette into the major LAT locus resulted in the production of a hybrid LAT transcript during latency which was translocated to the cytoplasm of latently infected neurones.

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1996-10-01
2024-04-25
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