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J. Virol., 05 1995, 2889-2897, Vol 69, No. 5
Copyright © 1995, American Society for Microbiology

Two overlapping transcription units which extend across the L-S junction of herpes simplex virus type 1

RA Bohenzky, M Lagunoff, B Roizman, EK Wagner and S Silverstein
Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.

A region of the herpes simplex virus type 1 genome located upstream of the alpha 0 promoter contains a promoter which regulates transcription in the opposite orientation to that driven by alpha 0. Analyses of mutants from which this promoter, alpha X, was deleted and a mutant in which a fragment that serves as a transcription terminator and polyadenylation signal was inserted upstream of this promoter demonstrate that two distinct transcription units overlap this region of the genome and are transcribed in a direction antisense to the neurovirulence gene gamma (1)34.5. One unit, dependent on the alpha X promoter, is active when cells are infected in the presence of the protein synthesis inhibitor cycloheximide. The second unit, independent of alpha X, is active during the course of productive infection. This transcription unit originates from a promoter upstream of alpha X which is distinct from the latency-associated promoter (LAP). Two polyadenylated transcripts of 0.9 and 4.9 kb accumulate from this region of the genome during productive infection, but no mature transcripts accumulate in infected cells maintained in the presence of cycloheximide. Kinetic analyses demonstrate that the transcripts that accumulate during productive infection fall into the beta class of herpes simplex virus type 1 genes.

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