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Herpes Simplex Virus Thymidine Kinase Gene Expression Under Control of a Late Viral Promoter / Post-Transcriptional Regulation of HSV Thymidine Kinase ExpressionDavies, Sherry January 1986 (has links)
Herpes simplex virus (HSV) genes are expressed as at least three coordinately regulated gene classes during lytic infection. The delayed-early (DE) and late (L) genes require previous expression of one or more immediate-early (IE) genes for their own expression. The DE genes achieve maximal expression prior to viral DNA synthesis, while the L genes are maximally expressed after DNA replication (Honess and Roizman, 1974). A recombinant strain of HSV-1, X1N17, was used in this study to examine the effect of the gene promoter on the temporal expression of HSV genes. This virus carries a late viral promoter upstream from the coding sequences of a DE gene (thymidine kinase; TK). S1-mapping studies showed that X1N17-TK transcripts initiated under the control of the late promoter and accumulated with L class kinetics. However, the TK activity levels in X1N17-infected cells were not consistent with HSV late gene expression. Western blot analysis of infected cell proteins revealed that despite the high levels of X1N17-TK mRNA present in the cytoplasm late after infection, little TK polypeptide was being synthesized. This suggested that HSV genes are subject to post-transcriptional control mechanisms that modulate the efficiency of translation of viral transcripts. More specifically, it appears as though HSV-TK transcripts are not efficiently translated at
late times in infected cells. / Thesis / Master of Science (MS)
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