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J. Virol., 09 1997, 6517-6525, Vol 71, No. 9
A Ensser, R Pflanz and B Fleckenstein
Alcelaphine herpesvirus 1 (AHV-1) causes wildebeest-associated malignant
catarrhal fever, a lymphoproliferative syndrome in ungulate species other
than the natural host. Based on biological properties and limited
structural data, it has been classified as a member of the genus
Rhadinovirus of the subfamily Gammaherpes-virinae. Here, we report on
cloning and structural analysis of the complete genome of AHV- 1 C500. The
low GC content DNA (L-DNA) region of the genome consists of 130,608 bp with
low (46.17%) GC content and marked suppression of CpG dinucleotide
frequency. Like in herpesvirus saimiri, the prototype of the
rhadinoviruses, the L-DNA is flanked by approximately 20 to 25 GC- rich
(71.83%) high GC content DNA (H-DNA) repeats of 1,113 to 1,118 nucleotides.
The analysis of the L-DNA sequence revealed 70 open reading frames (ORFs),
61 of which showed homology to other herpesviruses. The conserved ORFs are
arranged in four blocks collinear to other Rhadinovirus genomes. These gene
blocks are flanked by nonconserved regions containing ORFs without
similarities to known herpesvirus genes. Notably, a spliced reading frame
with a coding capacity for a 199-amino-acid protein is located in a
position homologous to the transforming genes of herpesvirus saimiri at the
left end of the L-DNA. A gene with homology to the semaphorin family is
located adjacent to this. Despite common biological and epidemiological
properties, AHV-1 differs significantly from herpesvirus saimiri with
regard to cell homologous genes, probably using a different set of effector
proteins to achieve a similar T-lymphocyte-transforming phenotype.
Copyright © 1997, American Society for Microbiology
Primary structure of the alcelaphine herpesvirus 1 genome
Institut fur Klinische und Molekulare Virologie der Universitat, Erlangen-Nuberg, Germany. ensser@viro.med.uni-erlangen.de
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