Abstract
Sheep betaretroviruses represent an interesting model to study the complex evolutionary interplay between host and pathogen in natural settings. In infected sheep, the exogenous and pathogenic Jaagsiekte sheep retrovirus (JSRV) coexists with at least 27 highly related endogenous JSRVs (enJSRVs). During evolution, some enJSRVs were co-opted by the host as they fulfilled important biological functions, including protection against infections by related exogenous retroviruses as well as conceptus development and placental morphogenesis. In particular, recent studies demonstrate that transdominant enJSRVs (i.e., those that are able to block JSRV replication) were positively selected during sheep domestication. Interestingly, viruses escaping these loci have recently emerged (less than 200 years ago). Overall, these findings suggest that the process of endogenization is still ongoing in sheep and, therefore, the evolutionary interplay between endogenous and exogenous sheep betaretroviruses and their hosts has not reached equilibrium.
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Acknowledgments
We are grateful to the members of the Laboratory of Viral Pathogenesis of the University of Glasgow Centre for Virus Research (CVR) for stimulating discussions. Work in the laboratory of the authors is supported by a programme grant of the Wellcome Trust, by a Strategic Research Developmental Grant by the Scottish Funding Council, and by NIH grant HD052745. M.P. is a Wolfson-Royal Society Research Merit Awardee.
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Armezzani, A., Murphy, L., Spencer, T.E., Palmarini, M., Arnaud, F. (2012). The Evolutionary Interplay Between Exogenous and Endogenous Sheep Betaretroviruses. In: Witzany, G. (eds) Viruses: Essential Agents of Life. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4899-6_15
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