1887

Abstract

The elk prion protein gene () encodes either methionine (M) or leucine (L) at codon 132, the L132 allele apparently affording protection against chronic wasting disease (CWD). The corresponding human codon 129 polymorphism influences the host range of bovine spongiform encephalopathy (BSE) prions. To fully address the influence of this cervid polymorphism on CWD pathogenesis, we created transgenic (Tg) mice expressing cervid PrP with L at residue 132, referred to as CerPrP-L132, and compared the transmissibility of CWD prions from elk of defined genotypes, namely homozygous M/M or L/L or heterozygous M/L, in these Tg mice with previously described Tg mice expressing CerPrP-M132, referred to as Tg(CerPrP) mice. While Tg(CerPrP) mice were consistently susceptible to CWD prions from elk of all three genotypes, Tg(CerPrP-L132) mice uniformly failed to develop disease following challenge with CWD prions. In contrast, SSBP/1 sheep scrapie prions transmitted efficiently to both Tg(CerPrP) and Tg(CerPrP-L132) mice. Our findings suggest that the elk 132 polymorphism controls prion susceptibility at the level of prion strain selection and that cervid PrP L132 severely restricts propagation of CWD prions. We speculate that the L132 polymorphism results in less efficient conversion of CerPrP-L132 by CWD prions, an effect that is overcome by the SSBP/1 strain. Our studies show the accumulation of subclinical levels of CerPrP in aged asymptomatic CWD-inoculated Tg(CerPrP-L132) mice and also suggests the establishment of a latent infection state in apparently healthy elk expressing this seemingly protective allele.

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2008-02-01
2024-04-24
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