| Autor: |
Ortín A; Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain., Cousens C; Moredun Research Institute, Edinburgh, UK., Minguijón E; Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain., Pascual Z; Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain., Villarreal MP; Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain., Sharp JM; Moredun Research Institute, Edinburgh, UK., Heras ML; Facultad de Veterinaria, Departamento de Patología Animal, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain. |
| Abstrakt: |
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 beta-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. |
