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Unraveling the key to the resistance of canids to prion diseases
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Unraveling the key to the resistance of canids to prion diseases
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Journal Article
Unraveling the key to the resistance of canids to prion diseases
2017
Overview
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.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Bovine spongiform encephalopathy
/ Brain
/ BSE
/ Cats
/ Cattle
/ Deer
/ Dogs
/ Encephalopathy, Bovine Spongiform - pathology
/ Medicine and Health Sciences
/ Mice
/ Prions
/ Protein Structure, Quaternary
/ Proteins
/ PrPC Proteins - ultrastructure
/ Rabbits
/ Research and Analysis Methods
/ Rodents
/ Sheep
/ Species
