Abstract
Fatal familial insomnia and a subtype of Creutzfeldt-Jakob disease, two clinically and pathologically distinct diseases, are linked to the same mutation at codon 178 (Asp-178-->Asn) but segregate with different genotypes determined by this mutation and the methionine-valine polymorphism at codon 129 of the prion protein gene. The abnormal isoforms of the prion protein in these two diseases were found to differ both in the relative abundance of glycosylated forms and in the size of the protease-resistant fragments. The size difference was consistent with a different protease cleavage site, suggesting a different conformation of the protease-resistant prion protein present in the two diseases. These differences are likely to be responsible for the type and location of the lesions that characterize these two diseases. Therefore, the combination of the mutation at codon 178 and the polymorphism at codon 129 determines the disease phenotype by producing two altered conformations of the prion protein.
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Selected References
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