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Virology. 2002 Mar 15;294(2):383-93.

Sequence analysis of the genome of porcine lymphotropic herpesvirus 1 and gene expression during posttransplant lymphoproliferative disease of pigs.

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Robert Koch-Institut, Nordufer 20, Berlin, 13353, Germany.


The porcine lymphotropic herpesvirus 1 (PLHV-1), the first gammaherpesvirus of pigs, has been detected at a high prevalence in healthy pig populations. A porcine gammaherpesvirus has also been detected at high copy numbers in animals suffering from posttransplant lymphoproliferative disease (PTLD). While human PTLD is a EBV-associated complication following clinical transplantation, porcine PTLD is a disease recently described in pigs undergoing experimental allogeneic hematopoietic stem cell transplantation. Here we demonstrate that PLHV-1 and the virus present in porcine PTLD are indistinguishable, and present the characterization of 73 kbp of the genome of PLHV-1. We identified homologs of cellular genes, including a putative G protein-coupled receptor (GCR) as well as a viral homolog of the bcl-2 oncogene (v-bcl-2) and show significant transcription of these genes as well as of several other PLHV-1 genes in lymph nodes of a PTLD-affected pig. These data indicate that PLHV-1 is active during PTLD and may be involved in the etiology of this lymphoproliferative disease.

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