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. 1994 Aug;68(8):4797–4810. doi: 10.1128/jvi.68.8.4797-4810.1994

The herpes simplex virus regulatory protein ICP27 contributes to the decrease in cellular mRNA levels during infection.

M A Hardwicke 1, R M Sandri-Goldin 1
PMCID: PMC236419  PMID: 8035480

Abstract

We have previously shown that the herpes simplex virus immediate-early regulatory protein ICP27 acts posttranscriptionally to affect mRNA processing (R. M. Sandri-Goldin and G. E. Mendoza, Genes Dev. 6:848-863, 1992). Specifically, in the presence of ICP27, spliced target mRNAs were decreased 5- to 10-fold in transfections with target genes containing a 5' or 3' intron. Here, we have investigated the effect of ICP27 during herpes simplex virus type 1 (HSV-1) infection on accumulation of spliced cellular mRNAs. ICP27 viral mutants have been shown to be defective in host shutoff (W. R. Sacks, C. C. Greene, D. P. Aschman, and P. A. Schaffer, J. Virol. 55:796-805, 1985). Therefore, we examined whether ICP27 could contribute to this complex process by decreasing cellular mRNA levels through its effects on host cell splicing. It was found that in infections with viral mutants defective in ICP27, the accumulated levels of three spliced host mRNAs were higher than those seen with wild-type HSV-1. The differences occurred posttranscriptionally as shown by nuclear runoff transcription assays. The stabilities of the spliced products during infection with wild-type or ICP27 mutant viruses were similar, and unspliced precursor mRNA for a viral spliced gene was detected in infections with wild-type HSV-1 but not in infections in which ICP27 was not expressed. These results suggest that the reduction in cellular mRNA levels and the accumulation of pre-mRNA are related and may be caused by an impairment in host cell splicing. These data further show that ICP27 is required for these effects to occur.

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