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Journal of Virology, March 1999, p. 1980-1989, Vol. 73, No. 3
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Mechanisms That Regulate Epstein-Barr Virus EBNA-1 Gene Transcription during Restricted Latency Are Conserved among Lymphocryptoviruses of Old World Primates

Ingrid K. Ruf,1 Amir Moghaddam,2 Fred Wang,2 and Jeffery Sample1,3,*

Program in Viral Oncogenesis and Tumor Immunology, Department of Virology and Molecular Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 381051; Department of Medicine, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts 021152; and Department of Pathology, University of Tennessee Health Sciences Center, Memphis, Tennessee 381633

Received 21 August 1998/Accepted 23 November 1998

Epstein-Barr virus (EBV), the only known human lymphocryptovirus (LCV), displays a remarkable degree of genetic and biologic identity to LCVs that infect Old World primates. Within their natural hosts, infection by these viruses recapitulates many key aspects of EBV infection, including the establishment of long-term latency within B lymphocytes, and is therefore a potentially valuable animal model of EBV infection. However, it is unclear whether these LCVs have adopted or maintained the same mechanisms used by EBV to express essential viral proteins, such as EBNA-1, in the face of cell-mediated repression of EBV gene expression that occurs upon establishment of the asymptomatic carrier state. To address this issue, we determined whether the endogenous LCVs of baboon (Cercopithecine herpesvirus 12) and rhesus macaque (Cercopithecine herpesvirus 15) have the functional equivalent of the EBV promoter Qp, which mediates exclusive expression of EBNA-1 during the restricted programs of EBV latency associated with the carrier state. Our results indicate that (i) both the baboon and rhesus macaque LCVs have a genomic locus that is highly homologous to the EBV Qp region, (ii) key cis-regulatory elements of Qp are conserved in these LCV genomes and compose promoters that are functionally indistinguishable from EBV Qp, and (iii) EBNA-1 transcripts identical in structure to EBV Qp-specific EBNA-1 mRNAs are present in nonhuman LCV-infected cells, demonstrating that these Qp homologs are indeed utilized as alternative EBNA-1 promoters. These observations indicate that the molecular mechanisms which regulate EBV gene expression during restricted latency have been conserved among the LCVs. The contribution of these mechanisms to viral persistence in vivo can now be experimentally tested in nonhuman primate models of LCV infection.

* Corresponding author. Mailing address: Department of Virology and Molecular Biology, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105. Phone: (901) 495-3467. Fax: (901) 523-2622. E-mail: jeff.sample{at}stjude.org.

Journal of Virology, March 1999, p. 1980-1989, Vol. 73, No. 3
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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