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J. Virol., Aug 1997, 5894-5904, Vol 71, No. 8
HW Virgin 4th, P Latreille, P Wamsley, K Hallsworth, KE Weck, AJ Dal Canto and SH Speck
Murine gammaherpesvirus 68 (gammaHV68) infects mice, thus providing a
tractable small-animal model for analysis of the acute and chronic
pathogenesis of gammaherpesviruses. To facilitate molecular analysis of
gammaHV68 pathogenesis, we have sequenced the gammaHV68 genome. The genome
contains 118,237 bp of unique sequence flanked by multiple copies of a
1,213-bp terminal repeat. The GC content of the unique portion of the
genome is 46%, while the GC content of the terminal repeat is 78%. The
unique portion of the genome is estimated to encode at least 80 genes and
is largely colinear with the genomes of Kaposi's sarcoma herpesvirus (KSHV;
also known as human herpesvirus 8), herpesvirus saimiri (HVS), and
Epstein-Barr virus (EBV). We detected 63 open reading frames (ORFs)
homologous to HVS and KSHV ORFs and used the HVS/KSHV numbering system to
designate these ORFs. gammaHV68 shares with HVS and KSHV ORFs homologous to
a complement regulatory protein (ORF 4), a D-type cyclin (ORF 72), and a
G-protein-coupled receptor with close homology to the interleukin-8
receptor (ORF 74). One ORF (K3) was identified in gammaHV68 as homologous
to both ORFs K3 and K5 of KSHV and contains a domain found in a bovine
herpesvirus 4 major immediate-early protein. We also detected 16
methionine-initiated ORFs predicted to encode proteins at least 100 amino
acids in length that are unique to gammaHV68 (ORFs M1 to 14). ORF M1 has
striking homology to poxvirus serpins, while ORF M11 encodes a potential
homolog of Bcl-2- like molecules encoded by other gammaherpesviruses (gene
16 of HVS and KSHV and the BHRF1 gene of EBV). In addition, clustered at
the left end of the unique region are eight sequences with significant
homology to bacterial tRNAs. The unique region of the genome contains two
internal repeats: a 40-bp repeat located between bp 26778 and 28191 in the
genome and a 100-bp repeat located between bp 98981 and 101170. Analysis of
the gammaHV68, HVS, EBV, and KSHV genomes demonstrated that each of these
viruses have large colinear gene blocks interspersed by regions containing
virus-specific ORFs. Interestingly, genes associated with EBV cell tropism,
latency, and transformation are all contained within these regions encoding
virus-specific genes. This finding suggests that pathogenesis-associated
genes of gammaherpesviruses, including gammaHV68, may be contained in
similarly positioned genome regions. The availability of the gammaHV68
genomic sequence will facilitate analysis of critical issues in
gammaherpesvirus biology via integration of molecular and pathogenetic
studies in a small-animal model.
Copyright © 1997, American Society for Microbiology
Complete sequence and genomic analysis of murine gammaherpesvirus 68
Department of Pathology and Center for Immunology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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