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- W2017136907 abstract "Considerable progress has been made deciphering the role of an abnormal isoform of the prion protein (PrP) in scrapie of animals and Gerstmann-Sträussler syndrome (GSS) of humans. Some transgenic (Tg) mouse (Mo) lines that carry and express a Syrian hamster (Ha) PrP gene developed scrapie 75 d after inoculation with Ha prions; non-Tg mice failed to show symptoms after 500 d. Brains of these infected Tg(HaPrP) mice featured protease-resistant HaPrPsc, amyloid plaques characteristic for Ha scrapie, and 109 ID50 units of Ha-specific prions upon bioassay. Studies on Syrian, Armenian, and Chinese hamsters suggest that the domain of the PrP molecule between codons 100 and 120 controls both the length of the incubation time and the deposition of PrP in amyloid plaques. Ataxic GSS in families shows genetic linkage to a mutation in the PrP gene, leading to the substitution of Leu for Pro at codon 102. Discovery of a point mutation in the Prp gene from humans with GSS established that GSS is unique among human diseases it is both genetic and infectious. These results have revised thinking about sporadic Creutzfeldt-Jakob disease, suggesting it may arise from a somatic mutation. These findings combined with those from many other studies assert that PrPsc is a component of the transmissible particle, and the PrP amino acid sequence controls the neuropathology and species specificity of prion infectivity. The precise mechanism of PrP& formation remains to be established. Attempts to demonstrate a scrapie-specific nucleic acid within highly purified preparations of prions have been unrewarding to date. Whether transmissible prions are composed only of PrPsc molecules or do they also contain a second component such as small polynucleotide remains uncertain." @default.
- W2017136907 created "2016-06-24" @default.
- W2017136907 creator A5066991343 @default.
- W2017136907 creator A5071021392 @default.
- W2017136907 date "1991-01-01" @default.
- W2017136907 modified "2023-09-29" @default.
- W2017136907 title "Molecular Biology and Transgenetics of Prion Diseases" @default.
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