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. 1985 Oct;4(10):2669–2674. doi: 10.1002/j.1460-2075.1985.tb03986.x

A transcription enhancer in the Herpesvirus saimiri genome.

S Schirm, F Weber, W Schaffner, B Fleckenstein
PMCID: PMC554559  PMID: 2996884

Abstract

Herpesvirus saimiri, an oncogenic agent of New World primates, has a linear double-stranded DNA genome of approximately 155 kb. To test its genome for the presence of a transcription enhancer, we have mixed randomly fragmented H. saimiri DNA with non-infectious, linear SV40 DNA lacking the 72-bp repeat enhancer region (the so-called SV40 enhancer trap) and co-transfected this DNA mixture into monkey CV-1 cells. Viable SV40-like viruses were generated by intracellular ligation/repair processes with short H. saimiri DNA fragments. One recombinant, SVHS-2, had integrated a 377-bp enhancer segment from the righthand region of the H. saimiri genome, 7 kb upstream of DNA sequences encoding an immediate-early mRNA. This enhancer sequence is contained within the non-repetitive portions of the viral genome known to be preserved episomally in all lymphoid tumor cell lines. Further recombinant viruses (SVHS-14, SVHS-7, and SVHS-8) essentially contain subsets of the 377-bp insert. Unlike in the previous enhancer trap experiments, where heterologous enhancers were incorporated without any sequence alterations, SVHS-14 and SVHS-7 have suffered short internal deletions of a very similar segment of the H. saimiri insert. This renders the enhancer more active, implying that the deleted segment, while it may have a role in the herpesvirus infection cycle, exerts a negative effect within the isolated enhancer.

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Selected References

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