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Genetic human prion disease modelled in PrP transgenic Drosophila

Published version
Peer-reviewed

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Authors

Thackray, AM 
Cardova, A 

Abstract

Inherited human prion diseases, such as fatal familial insomnia (FFI) and familial Creutzfeldt–Jakob disease (fCJD), are associated with autosomal dominant mutations in the human prion protein gene PRNP and accumulation of PrPSc, an abnormal isomer of the normal host protein PrPC, in the brain of affected individuals. PrPSc is the principal component of the transmissible neurotoxic prion agent. It is important to identify molecular pathways and cellular processes that regulate prion formation and prion-induced neurotoxicity. This will allow identification of possible therapeutic interventions for individuals with, or at risk from, genetic human prion disease. Increasingly, Drosophila has been used to model human neurodegenerative disease. An important unanswered question is whether genetic prion disease with concomitant spontaneous prion formation can be modelled in Drosophila. We have used pUAST/PhiC31-mediated site-directed mutagenesis to generate Drosophila transgenic for murine or hamster PrP (prion protein) that carry single-codon mutations associated with genetic human prion disease. Mouse or hamster PrP harbouring an FFI (D178N) or fCJD (E200K) mutation showed mild Proteinase K resistance when expressed in Drosophila. Adult Drosophila transgenic for FFI or fCJD variants of mouse or hamster PrP displayed a spontaneous decline in locomotor ability that increased in severity as the flies aged. Significantly, this mutant PrPmediated neurotoxic fly phenotype was transferable to recipient Drosophila that expressed the wild-type form of the transgene. Collectively, our novel data are indicative of the spontaneous formation of a PrP-dependent neurotoxic phenotype in FFI- or CJD-PrP transgenic Drosophila and show that inherited human prion disease can be modelled in this invertebrate host.

Description

Keywords

Drosophila melanogaster, PrPSc, genetic, neurotoxicity, prion, transmissible, Animals, Animals, Genetically Modified, Blotting, Western, Cricetinae, Drosophila melanogaster, Endopeptidase K, Humans, Locomotion, Mice, Microscopy, Confocal, Mutation, Neurotoxins, Prion Diseases, Prion Proteins, Transgenes

Journal Title

Biochemical Journal

Conference Name

Journal ISSN

0264-6021
1470-8728

Volume Title

474

Publisher

Portland Press, Ltd.
Sponsorship
National Centre for the Replacement Refinement and Reduction of Animals in Research (NC/K000462/1)
Biotechnology and Biological Sciences Research Council (BB/J014540/1)
This work was supported in part by an MRC (NC3Rs) Project Grant NC/K000462/1. AC was supported by a BBSRC postgraduate studentship award (Doctoral Training Partnership Grant BB/J014540/1).