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000145575 041__ $$aEnglish
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000145575 1001_ $$0P:(DE-2719)2810486$$aKaczmarczyk, Lech$$b0$$udzne
000145575 1112_ $$aPRION 2019$$cEdmonton$$d2019-05-21 - 2019-05-24$$wCanada
000145575 245__ $$aCaribou Prnp polymorphism distribution in Canada and its impact on CWD pathogenesis
000145575 260__ $$c2019
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000145575 520__ $$aWild reindeer in Norway were recently diagnosed withchronic wasting disease (CWD) [1]. Prions from CWD-infected deer were also transmissible to other reindeer inexperimental settings [2,3]. Although CWD has not yetbeen reported in wild reindeer (caribou) in Canada, thesestudies show that they are at risk of infection. The wild-typereindeer, homozygous for serine at prion protein (PrP)residue 138 (138SS), developed clinical disease upon oralinoculation. Animals carrying at least one asparagine allele(138SN, 138NN) accumulated prions only in the periphery.However, both genotypes were susceptible to intracerebralprion inoculation [2,3]. Fallow deer are wild-type 138NNand are resistant to peripheral but not intracerebral prioninfection [4]. Thus, we hypothesize that the138N allele,present in caribou herds in Alberta [5], alters CWD patho-genesis by limiting prion transport from the periphery tothe CNS. Our aim is to elucidate the mechanisms involvedin this process.We extracted DNA from ±800 caribou, sequenced thePrnpopen reading frame and determined the 138N alleleprevalence in Canadian caribou populations. Resultsshow that the 138N allele was highly prevalent in theChinchaga woodland caribou population in BC (64%). Itwas also higher in barren-ground (37%) than in otherwoodland caribou populations (26%). To analyse howthe 138N allele affects CWD pathogenesis, we generatedknock-in (KI) mice where the mouse PrP is replaced bywild-type 138SS or 138NN cervid PrP. The KIs wereobtained  by  injecting  CRISPR/Cas9-edited  C57BL6embryonic stem cells (Bruce4) into wild-type blastocysts,generating chimeras, and breeding progeny to homozyg-osity in a C57BL6 background. PrP expression was deter-mined using western blotting and qPCR. Correct PrPpost-translational  modifications  were  confirmed  byPNGase-F and Endo-H digestion. We will inoculate ourKIs with CWD-positive material from the correspondingreindeer genotypes [1,2]. The CWD-infected reindeermaterial was characterized by real-time quaking-inducedconversion (RT-QuIC) and its transmissibility to trans-genic mice overexpressing elk PrP (TgElk). Attack rate inthe TgElks were almost 100%, except for those inoculatedwith 138SN lymph node material. Western blotting con-firmed the presence of proteinase-K resistant PrP in allterminally ill mice. Our goal is to analyse the susceptibilityof KIs carrying the 138N allele to intracerebral and per-ipheral prion infection. We will also assess the efficiencyof prion transport from the periphery to the CNS in intraperitoneally inoculated KIs. Prion strain propagationwithin a host is highly dependent on its PrP genotype.This study will provide insight into how the 138N PrPspecifically influences CWD propagation in caribou.
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000145575 7001_ $$0P:(DE-2719)2810253$$aJackson, Walker Scot$$b1$$udzne
000145575 773__ $$0PERI:(DE-600)2267671-5$$p28 - 29$$tPrion$$v13$$x1933-6896$$y2019
000145575 8564_ $$uhttps://www.tandfonline.com/doi/pdf/10.1080/19336896.2019.1615197
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