Unraveling the key to the resistance of canids to prion diseases

Natalia Fernández-Borges, Beatriz Parra, Hasier Eraña, Manuel A. Sánchez-Martín, Jorge de Castro, Saioa R. Elezgarai, Tomás Mayoral, Joaquín Castilla, Marti Pumarola Batlle, Enric Vidal Barba

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

© 2017 Fernández-Borges et al. One of the characteristics of prions is their ability to infect some species but not others and prion resistant species have been of special interest because of their potential in deciphering the determinants for susceptibility. Previously, we developed different in vitro and in vivo models to assess the susceptibility of species that were erroneously considered resistant to prion infection, such as members of the Leporidae and Equidae families. Here we undertake in vitro and in vivo approaches to understand the unresolved low prion susceptibility of canids. Studies based on the amino acid sequence of the canine prion protein (PrP), together with a structural analysis in silico, identified unique key amino acids whose characteristics could orchestrate its high resistance to prion disease. Cell- and brain-based PMCA studies were performed highlighting the relevance of the D163 amino acid in proneness to protein misfolding. This was also investigated by the generation of a novel transgenic mouse model carrying this substitution and these mice showed complete resistance to disease despite intracerebral challenge with three different mouse prion strains (RML, 22L and 301C) known to cause disease in wild-type mice. These findings suggest that dog D163 amino acid is primarily, if not totally, responsible for the prion resistance of canids.
Original languageEnglish
Article numbere1006716
JournalPLoS Pathogens
Volume13
Issue number11
DOIs
Publication statusPublished - 1 Nov 2017

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