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. 1985 Mar;5(3):518–528. doi: 10.1128/mcb.5.3.518

gamma 2-Thymidine kinase chimeras are identically transcribed but regulated a gamma 2 genes in herpes simplex virus genomes and as beta genes in cell genomes.

S Silver, B Roizman
PMCID: PMC366744  PMID: 2985955

Abstract

True gamma or gamma 2 genes, unlike alpha, beta, and gamma 1 (beta gamma) genes of herpes simplex virus 1 (HSV-1), stringently require viral DNA synthesis for their expression. We report that gamma 2 genes resident in cells were induced in trans by infection with HSV-1 but that the induction did not require amplification of either the resident gene or the infecting viral genome. Specifically, to test the hypothesis that expression of these genes is amplification dependent, we constructed two sets of gamma 2-thymidine kinase (TK) chimeric genes. The first (pRB3038) consisted of the promoter-regulatory region and a portion of 5'-transcribed noncoding region of the domain of a gamma 2 gene identified by Hall et al. (J. Virol. 43:594-607) in the HSV-1(F) BamHI fragment D' to the 5'-transcribed noncoding and coding regions of the TK gene. The second (pRB3048) contained, in addition, an origin of HSV-1 DNA replication. Cells transfected with either the first or second construct and selected for the TK+ phenotype were then tested for TK induction after superinfection with HSV-1(F) delta 305, containing a deletion in the coding sequences of the TK gene, and viruses containing, in addition, a ts lesion in the alpha 4 regulatory protein (ts502 delta 305) or in the beta 8 major DNA-binding protein (tsHA1 delta 305). The results were as follows: induction by infection with TK- virus of chimeric TK genes with or without an origin of DNA replication was dependent on functional alpha 4 protein but not on viral DNA synthesis; the resident chimeric gene in cells selected for G418 (neomycin) resistance was regulated in the same fashion; the chimeric gene recombined into the viral DNA was regulated as a gamma 2 gene in that its expression in infected cells was dependent on viral DNA synthesis; the gamma 2-chimeric genes resident in the host and in viral genomes were transcribed from the donor BamHI fragment D' containing the promoter-regulatory domain of the gamma 2 gene. The significance of the differential regulation of gamma 2 genes in the environments of host and viral genomes by viral trans-acting factors is discussed.

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Selected References

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