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Journal of Virology, April 1999, p. 2974-2982, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Genetic Evidence that EBNA-1 Is Needed for Efficient, Stable Latent Infection by Epstein-Barr Virus

May-Ann Lee, Margaret E. Diamond, and John L. Yates*

Department of Genetics, Roswell Park Cancer Institute, Buffalo, New York 14263

Received 5 October 1998/Accepted 7 January 1999

Replication and maintenance of the 170-kb circular chromosome of Epstein-Barr virus (EBV) during latent infection are generally believed to depend upon a single viral gene product, the nuclear protein EBNA-1. EBNA-1 binds to two clusters of sites at oriP, an 1,800-bp sequence on the EBV genome which can support replication and maintenance of artificial plasmids introduced into cell lines that contain EBNA-1. To investigate the importance of EBNA-1 to latent infection by EBV, we introduced a frameshift mutation into the EBNA-1 gene of EBV by recombination along with a flanking selectable marker. EBV genomes carrying the frameshift mutation could be isolated readily after superinfecting EBV-positive cell lines, but not if recombinant virus was used to infect EBV-negative B-cell lines or to immortalize peripheral blood B cells. EBV mutants lacking almost all of internal repeat 3, which encode a repetitive glycine and alanine domain of EBNA-1, were generated in the same way and found to immortalize B cells normally. An EBNA-1-deficient mutant of EBV was isolated and found to be incapable of establishing a latent infection of the cell line BL30 at a detectable frequency, indicating that the mutant was less than 1% as efficient as an isogenic, EBNA-1-positive strain in this assay. The data indicate that EBNA-1 is required for efficient and stable latent infection by EBV under the conditions tested. Evidence from other studies now indicates that autonomous maintenance of the EBV chromosome during latent infection does not depend on the replication initiation function of oriP. It is therefore likely that the viral chromosome maintenance (segregation) function of oriP and EBNA-1 is what is required.

* Corresponding author. Mailing address: Department of Genetics, Roswell Park Cancer Institute, Elm and Carlton St., Buffalo, NY 14263. Phone: (716) 845-8964. Fax: (716) 845-8449. E-mail: yates{at}sc3101.med.buffalo.edu.

Journal of Virology, April 1999, p. 2974-2982, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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