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Characterization of enzootic nasal tumour virus of goats: complete sequence and tissue distribution

J. Michael Sharp^2,

¹ Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain
² Moredun Research Institute, Edinburgh, UK

Correspondence
Marcelo De las Heras
lasheras{at}unizar.es

The complete genome sequence of a new isolate of enzootic nasal tumour virus (ENTV-2), associated with enzootic nasal adenocarcinoma (ENA) of goats, was determined. The genome exhibits a genetic organization characteristic of -retroviruses. ENTV-2 is closely related to the retrovirus (ENTV-1) associated with enzootic adenocarcinoma of sheep, and to jaagsiekte retrovirus. The main sequence differences between these viruses reside in orfX, the U3 LTR, two small regions in gag and the transmembrane (TM) region of env. Sequence analysis of the TM region of env from several sheep and goats naturally affected by ENA suggested that ENTV-1 and ENTV-2 are distinct viruses rather than geographical variants. Although both viruses transform secretory epithelial cells of the ethmoid turbinate, the study of their tissue distribution using specific PCRs showed that ENTV-2 establishes a disseminated lymphoid infection whereas ENTV-1 is mainly confined to the tumour.

The GenBank accession numbers of the sequences reported in this paper are: AY197548, AY196354-AY196359, AY196532 and AY196353.

Present address: Veterinary Laboratories Agency, Pentlands Science Park, Bush Loan, Edinburgh, UK.

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