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Open AccessArticle

The U3 and Env Proteins of Jaagsiekte Sheep Retrovirus and Enzootic Nasal Tumor Virus Both Contribute to Tissue Tropism

1
Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada
2
McMaster Immunology Research Center, Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON L8S 4L8, Canada
3
Department of Cellular and Molecular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada
*
Author to whom correspondence should be addressed.
Viruses 2019, 11(11), 1061; https://doi.org/10.3390/v11111061
Received: 25 October 2019 / Revised: 12 November 2019 / Accepted: 12 November 2019 / Published: 14 November 2019
(This article belongs to the Section Animal Viruses)
Jaagsiekte sheep retrovirus (JSRV) and enzootic nasal tumor virus (ENTV) are small-ruminant betaretroviruses that share high nucleotide and amino acid identity, utilize the same cellular receptor, hyaluronoglucosaminidase 2 (Hyal2) for entry, and transform tissues with their envelope (Env) glycoprotein; yet, they target discrete regions of the respiratory tract—the lung and nose, respectively. This distinct tissue selectivity makes them ideal tools with which to study the pathogenesis of betaretroviruses. To uncover the genetic determinants of tropism, we constructed JSRV–ENTV chimeric viruses and produced lentivectors pseudotyped with the Env proteins from JSRV (Jenv) and ENTV (Eenv). Through the transduction and infection of lung and nasal turbinate tissue slices, we observed that Hyal2 expression levels strongly influence ENTV entry, but that the long terminal repeat (LTR) promoters of these viruses are likely responsible for tissue-specificity. Furthermore, we show evidence of ENTV Env expression in chondrocytes within ENTV-infected nasal turbinate tissue, where Hyal2 is highly expressed. Our work suggests that the unique tissue tropism of JSRV and ENTV stems from the combined effort of the envelope glycoprotein-receptor interactions and the LTR and provides new insight into the pathogenesis of ENTV. View Full-Text
Keywords: tropism; long terminal repeat (LTR), sheep betaretroviruses; envelope glycoproteins; chimeric virus; pseudotyping; pathogenesis tropism; long terminal repeat (LTR), sheep betaretroviruses; envelope glycoproteins; chimeric virus; pseudotyping; pathogenesis
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Rosales Gerpe, M.C.; van Lieshout, L.P.; Domm, J.M.; Ingrao, J.C.; Datu, J.; Walsh, S.R.; Yu, D.L.; de Jong, J.; Krell, P.J.; Wootton, S.K. The U3 and Env Proteins of Jaagsiekte Sheep Retrovirus and Enzootic Nasal Tumor Virus Both Contribute to Tissue Tropism. Viruses 2019, 11, 1061.

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