Abstract
THE human prion diseases, Creutzfeldt–Jakob disease (CJD) and Gerstmann–Sträussler syndrome (GSS), are neurodegenerative diseases that are unique in being both infectious and genetic. Transmission of both diseases and the animal spongiform encephalopathies (for example, scrapie and bovine spongiform encephalopathy) to experimental animals by intracerebral inoculation with brain homogenates is well documented1. Despite their experimental transmissibility, missense and insertional mutations in the prion protein gene are associated with both GSS and familial CJD, demonstrating that the human familial cases are autosomal dominant diseases2–6. More that 80% of CJD cases occur sporadically, however, and are not known to be associated with mutations. Here we report that 21 of 22 sporadic CJD cases and a further 19 of 23 suspected sporadic CJD cases are homozygous at the polymorphic amino-acid residue 129; 51% of the normal population are heterozygous at this site. We argue that homozygosity predisposes towards sporadic CJD and that this directly supports the hypothesis that interaction between prion protein molecules underlies the disease process.
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Palmer, M., Dryden, A., Hughes, J. et al. Homozygous prion protein genotype predisposes to sporadic Creutzfeldt–Jakob disease. Nature 352, 340–342 (1991). https://doi.org/10.1038/352340a0
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DOI: https://doi.org/10.1038/352340a0
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