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. 1981 Jan;37(1):459–472. doi: 10.1128/jvi.37.1.459-472.1981

Factors Governing Expression of the Herpes Simplex Virus Gene for Thymidine Kinase in Clonal Derivatives of Transformed Mouse L Cells

Ralph Buttyan 1,†, Patricia G Spear 1
PMCID: PMC171022  PMID: 6260994

Abstract

The cells used in this study are sublines of a transformed mouse L cell line (designated H2) that carries the herpes simplex virus (HSV) gene for thymidine kinase (tk) as well as other viral genetic information acquired after exposure of the parental Ltk- cells to UV-irradiated HSV type 1. These sublines of the H2 cell line were isolated by cloning under nonselective conditions and were shown to express widely different levels of viral tk. Selective media were used to isolate phenotypically tk- and tk+ variants in sequence from one of the clonal derivatives. As previously reported, superinfection of the tk+ cell lines with tk- HSV type 1 resulted in enhancement of tk activity. A new finding was that viral tk activity could be induced by superinfection in at least 30% of cells from the phenotypically tk- sublines, indicating that a functional viral tk gene was retained in a significant proportion of the cells. Experiments were designed to test for the presence of regulatory factors that could influence tk expression in the nonsuperinfected sublines of H2. Absence of freely diffusible regulatory factors was indicated by the finding that the fusion of phenotypically tk- and tk+ cells and untransformed cells in appropriate combinations did not affect the levels of tk detected. Moreover, there was no evidence for the presence in phenotypically tk+ transformed cells of HSV-specific regulatory factors that could influence expression of tk from a superinfecting viral genome. Phenotypically tk+ sublines of H2 were found to differ from the phenotypically tk- sublines and from untransformed cells in that the tk+ cells synthesized viral proteins earlier and produced greater yields of infectious HSV progeny after superinfection with wild-type tk+ virus. We can conclude that the absence of tk expression in the tk- H2 sublines cannot be accounted for by rearrangements or loss of DNA sequences encoding the enzyme itself or of sequences necessary for induction of the gene by superinfecting HSV. Moreover, it appears that the expression of tk in the tk+ H2 sublines correlates with the presence of some factor that can enhance (or the absence of some factor that can depress) HSV replication and gene expression.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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