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. 1985 Oct;5(10):2533–2542. doi: 10.1128/mcb.5.10.2533

Mapping genetic elements of Epstein-Barr virus that facilitate extrachromosomal persistence of Epstein-Barr virus-derived plasmids in human cells.

S Lupton, A J Levine
PMCID: PMC366987  PMID: 3016506

Abstract

The Epstein-Barr virus (EBV) genome becomes established as a multicopy plasmid in the nucleus of infected B lymphocytes. A cis-acting DNA sequence previously described within the BamHI-C fragment of the EBV genome (J. Yates, N. Warren, D. Reisman, and B. Sugden, Proc. Natl. Acad. Sci. USA 81:3806-3810, 1984) allows stable extrachromosomal plasmid maintenance in latently infected cells, but not in EBV-negative cells. In agreement with the findings of Yates et al., deletion analysis permitted the assignment of this function to a 2,208-base-pair region (nucleotides 7315 to 9517 of the B95-8 strain of EBV) of the BamHI-C fragment that contained a striking repetitive sequence and an extended region of dyad symmetry. A recombinant vector, p410+, was constructed which carried the BamHI-K fragment (nucleotides 107565 to 112625 of the B95-8 strain, encoding the EBV-associated nuclear antigen EBNA-1), the cis-acting sequence from the BamHI-C fragment, and a dominant selectable marker gene encoding G-418 resistance in animal cells. After being transfected into HeLa cells, this plasmid persisted extrachromosomally at a low copy number, with no detectable rearrangements or deletions. Two mutations in the BamHI-K-derived portion of p410+, a large in-frame deletion and a linker insertion frameshift mutation, both of which alter the carboxy-terminal portion of EBNA-1, destroyed the ability of the plasmid to persist extrachromosomally in HeLa cells. A small in-frame deletion and linker insertion mutation in the region encoding the carboxy-terminal portion of EBNA-1, which replaced 19 amino acid codons with 2, had no effect on the maintenance of p410+ in HeLa cells. These observations indicate that EBNA-1, in combination with a cis-acting sequence in the BamHI-C fragment, is in part responsible for extrachromosomal EBV-derived plasmid maintenance in HeLa cells. Two additional activities have been localized to the BamHI-C DNA fragment: (i) a DNA sequence that could functionally substitute for the simian virus 40 enhancer and promoter elements controlling the expression of G-418 resistance and (ii) a DNA sequence which, although not sufficient to allow extrachromosomal plasmid maintenance, enhanced the frequency of transformation to G-418 resistance in EBV-positive (but not EBV-negative) cells. These findings suggest that the BamHI-C fragment contains a lymphoid-specific or EBV-inducible promoter or enhancer element or both.

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Selected References

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