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Journal of Virology, January 2002, p. 421-426, Vol. 76, No. 1
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.76.1.421-426.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Complete Nucleotide Sequence of the Rhesus Lymphocryptovirus: Genetic Validation for an Epstein-Barr Virus Animal Model
Pierre Rivailler,1 Hua Jiang,1 Young-gyu Cho,1 Carol Quink,1 and Fred Wang1*
Department of Medicine, Brigham & Womens Hospital, Harvard Medical School, Boston, Massachusetts 02115
Received 28 June 2001/
Accepted 21 September 2001

ABSTRACT
We sequenced the rhesus lymphocryptovirus (LCV) genome in order
to determine its genetic similarity to Epstein-Barr virus (EBV).
The rhesus LCV encodes a repertoire identical to that of EBV,
with 80 open reading frames, including cellular interleukin-10,
bcl-2, and colony-stimulating factor 1 receptor homologues and
an equivalent set of viral glycoproteins. The highly conserved
rhesus LCV gene repertoire provides a unique animal model for
the study of EBV pathogenesis.

TEXT
Epstein-Barr virus (EBV)-related herpesviruses in the same gamma-1,
or lymphocryptovirus (LCV), genera are known to naturally infect
both Old and New World nonhuman primates, and the biology of
these nonhuman LCVs appears indistinguishable from that of EBV
(reviewed in reference
35). The potential utility of using Old
World LCV as an animal model system was demonstrated by the
ability to experimentally infect naive rhesus macaques with
rhesus LCVs and reproduce many aspects of acute and persistent
EBV infection in humans (
20).
Previous studies revealed that Old World LCV genomes are organized in a colinear fashion with EBV and that EBV DNA cross-reacts with viral DNA from simian LCVs (11, 12). Rhesus LCV homologues for most of the EBV latent infection genes have been described (reviewed in reference 35). In virtually every aspect, these rhesus LCV latent infection genes are functionally interchangeable with the EBV genes despite modest degrees of homology (27 to 50% amino acid homology). However, the gene repertoire from the rhesus LCV, or any gamma-1 herpesvirus besides EBV, has not been completely characterized, particularly those genes encoding cellular homologues and viral glycoproteins that are highly relevant for studies in an animal model system. The development of a rhesus LCV genetic system to generate mutant viruses for use in experimental infections and study of molecular pathogenesis in vivo also requires a thorough understanding of the rhesus LCV genome and its sequence as a starting point.
Primary sequence and genome structure of rhesus LCV.
Six overlapping cosmid and two plasmid viral DNA clones were isolated from the rhesus LCV-infected B-cell line LCL8664 (Fig. 1A). A shotgun cloning and sequencing strategy was used to derive contiguous sequences from these eight viral DNA clones. The complete rhesus LCV sequence was assembled with a sevenfold average redundancy from 1,500 overlapping sequences of 300 to 800 nucleotides.
The rhesus LCV genome contains internal (IR1 to IR4) and terminal
repeats (TR) as in EBV (Fig.
1B). The major internal repeat,
IR1, contains 5.7 copies of a 3,072-bp motif that is 61.5% homologous
to the 3,072-bp
BamHI W fragment of the EBV IR1. The rhesus
LCV TR consists of a 933-bp motif versus a 538-bp motif in the
EBV TR, and there is no significant sequence homology besides
a similarly high GC content (75%). Based on 5.7 copies in the
major internal repeat and 4 TR copies, the rhesus LCV genome
has 171,096 nucleotides (versus 172,231 bp in B95-8 EBV with
11.3 IR1 copies and 4 TR copies), with an overall GC content
of 62% (60% for EBV), and 65% overall nucleotide homology with
the EBV genome.
ORFs encoded in rhesus LCV.
Eighty open reading frames (ORFs) are identified in the rhesus LCV sequence (Fig. 1C, Table 1). Each of the rhesus LCV ORFs has a homologue in EBV, each is located in a similar relative position as in EBV, and every EBV ORF is represented in the rhesus LCV genome. Thus, the rhesus LCV, in contrast to the recently described New World primate marmoset LCV (5), has the same viral gene repertoire as EBV. The average homology among all EBV and rhesus LCV ORFs is 75.6% compared to an average homology of 47.3% between EBV and marmoset LCV ORFs (5). Because of the overall similarity in repertoire and sequence, we have adopted the EBV nomenclature with the prefix rh to identify the rhesus LCV ORFs.
Rhesus LCV latent infection genes.
Homologues for the rhesus LCV EBV-encoded small RNAs (EBERs),
EBNA-LP, two types of EBNA-2, EBNA-1, EBNA-3A, -3B, and -3C,
LMP1, LMP2A, and LMP2B have been reported previously (
3,
6,
8,
15,
24,
26,
27). The complete rhesus LCV sequence shows that
there is also a homologue for the EBV BARF0 open reading frame,
with 77% homology, suggesting that the family of EBV
BamHI A
transcripts expressed during latent infection are also likely
to be conserved in the rhesus LCV. The latent infection genes
are generally the least well conserved among all rhesus LCV
genes (Fig.
1C, Table
1).
Conservation of LCV lytic infection genes.
Most of the EBV lytic infection genes have homologues in other herpesviruses due to the conserved mechanisms for herpesvirus replication. These 56 ORFs (24 late, 32 early, and 1 immediate-early lytic infection viral gene product) have an average homology of 82.8% with the rhesus LCV homologues (Fig. 1C, ORFs with bold outline). Fifteen EBV lytic infection ORFs do not have homologues in other herpesviruses, i.e., they are restricted to gamma-1 herpesviruses, and the rhesus LCV homologues for these ORFs have an average homology of 60.3%. These genes have presumably evolved more recently and are generally less well conserved between EBV and rhesus LCV.
ORFs encoding homologues of cellular proteins.
Four EBV lytic infection genes are cell gene homologues likely to have been captured because they provide a biologic advantage during EBV infection. These include a viral interleukin-10 (vIL-10; BCRF1), two bcl-2 homologues (BHRF1 and BALF1), and a colony-stimulating factor 1 receptor (CSF-1R) homologue (BARF1) (14, 18, 19, 32). These viral genes are not essential for EBV-induced transformation of B-cell growth and for EBV replication in vitro (7, 18, 33). Rhesus LCV has captured an identical repertoire of cellular homologues. Conservation of these ORFs in the rhesus LCV (73 to 84% homology relative to the EBV proteins) indicates that these cellular homologues provide biologic advantages that are common to both EBV and rhesus LCV infection in their natural hosts.
Viral membrane proteins.
Viral membrane proteins are important for cell tropism, as targets for the host immune response, and for pathogenesis of infection in vivo. All 10 EBV ORFs known to encode viral membrane glycoproteins are positionally conserved in the rhesus LCV. Five of these glycoproteins are conserved in all herpesviruses (gB, gH, gL, gM, and gN) and are important for herpesvirus virus assembly, egress, and cell fusion (13, 16, 17, 21). These glycoproteins are well conserved in the rhesus LCV (74 to 90% homology with the EBV glycoproteins). Five glycoproteins are restricted to gammaherpesviruses, and these viral gene products are likely to be important for LCV biology and pathogenesis. Among these, gp350 and gp150 have the lowest degree of homology between EBV and the rhesus LCV, 49.3 and 46.6% homology, respectively. gp350 is the major viral membrane glycoprotein that binds to CR2/CD21 and is a major determinant for EBVs B-cell tropism (22, 34). gp150 is not essential for EBV replication and infection in vitro (4), suggesting an important role for this glycoprotein during human and rhesus LCV infection in vivo.
The rhesus LCV is only the second completely sequenced genome from the oncogenic LCV genera. The EBV B95-8 strain was the first gamma-1 herpesvirus fully sequenced (2). Portions of several other EBV strains have been sequenced (23, 29). Analysis of an 11-kb DNA sequence from Raji EBV demonstrated that the B95-8 strain is a deletion mutant, missing a duplicated ori-lyt sequence (DR) at the right-hand side of the genome (10, 23, 25). Thus, the rhesus LCV genome is the first complete sequence derived from a prototypical LCV genome.
The identical repertoire of lytic and latent infection genes between EBV and the rhesus LCV demonstrates the close genetic relationship between these two viruses and provides genetic validation that the rhesus LCV is an accurate model for studying EBV pathogenesis. The conservation of a type 1 latency EBNA-1 promoter (28) and the existence of two different rhesus LCV types similar to type 1 and 2 EBV (6) provide further evidence of the biologic and genetic similarities between EBV and the rhesus LCV. Thus, Old World LCVs, such as the rhesus LCV, appear to have evolved very closely in parallel with EBV, whereas New World LCVs, such as the marmoset LCV, appear to have evolved somewhat differently despite the overt biologic similarities (5). Thus, the evolutionary distances between human, Old World, and New World LCVs are similar to the relationships between New World, Old World, and human hosts. Studies in both New and Old World model systems may provide a better understanding of how various viral genes contribute to successful EBV infection and pathogenesis in vivo.
Primates have been touted as important animal model systems for studying human virus infection because of the strong similarities in both the viruses and the natural hosts. To our knowledge, only two other herpesviruses naturally infecting Old World nonhuman primate species have been completely sequenced, rhesus rhadinovirus (RRV) and simian varicella virus (SVV) (1, 9, 30), and both have been proposed as animal models for human herpesvirus infections (31, 36). However, the viral gene repertoire from these two viruses is not identical to their human counterparts, Kaposis sarcoma herpesvirus (KSHV) and varicella-zoster virus (VZV). RRV does not encode homologues for the KSHV K3, K5, K7, K8, K8.1, and K12 ORFs (1, 30). In addition, the dihydrofolate reductase (DHFR) homologue is encoded in a different location and the copy numbers of macrophage inflammatory protein and viral interferon regulatory factor homologues are different.
Similarly, the SVV and VZV genomes do not have an identical gene repertoire. SVV does not encode a homologue for the VZV ORF2, a gene with unknown function, and SVV encodes for a novel ORF A that is a truncated form of VZV ORF4 (9). In addition, the average homology of RRV and SVV ORFs with their human herpesvirus counterparts is relatively low, approximately 55%, versus 75% between rhesus LCV and EBV. Thus, the identical gene repertoire and high overall sequence homology make the rhesus LCV a uniquely accurate animal model for studying EBV pathogenesis.

ACKNOWLEDGMENTS
We acknowledge members of the Massachusetts General Hospital
DNA Sequencing Core (Harry Orf, Brian Seed, Dan Stetson, and
David Levin) and the Brigham & Womens Hospital Genetics
Core (David Beier) for assistance with and performance of high-throughput
DNA sequencing. We thank Elliott Kieff for valuable advice.
This work was supported by grants from the U.S. Public Health Service (CA68051) and the American Heart Association.

FOOTNOTES
* Corresponding author. Mailing address: Channing Laboratories, 181 Longwood Ave., Boston, MA 02115. Phone: (617) 525-4258. Fax: (617) 525-4257. E-mail:
fwang{at}rics.bwh.harvard.edu.


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Journal of Virology, January 2002, p. 421-426, Vol. 76, No. 1
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.76.1.421-426.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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