Abstract
PrP glycoprotein gene polymorphisms were examined in Swaledale sheep affected by natural scrapie, in healthy sheep and in Swaledales selected for low susceptibility to scrapie. The three groups differed significantly in frequencies of PrP genotypes detected by the restriction enzymes EcoRI, HindIII and BspHI, the latter being indicative of a PrP protein amino acid difference at codon 136. These frequency differences were confirmed in a single-flock study and present good evidence that scrapie susceptibility and resistance are associated with PrP gene variants in Swaledale sheep.
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