1887

Abstract

Susceptibility and incubation periods of transmissible spongiform encephalopathies, such as scrapie in sheep, are modulated by the PrP gene. The standard model of association between ovine PrP genetics and classical scrapie susceptibility is based on PrP genotypes with respect to codons 136, 154 and 171, e.g. alanine–arginine–glutamine (ARQ). It is demonstrated here that a proline to leucine substitution in codon 168 of the ovine PrP protein gene is associated with increased resistance to experimental bovine spongiform encephalopathy (BSE) inoculation. The ARLQ PrP allele was found in heterozygous ARPQ/ARLQ sheep that have so far survived intravenous BSE challenge three times longer than BSE-challenged homozygous ARPQ/ARPQ sheep, which develop disease in around 700 days. In contrast, the L141F polymorphism does not appear to be associated with susceptibility to intravenous BSE challenge.

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2006-12-01
2019-08-20
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