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• W1983144164 abstract "The transmissible spongiform encephalopathies constitute a fascinating and biologically unique group of invariably fatal neurodegenerative disorders that affect both animals and humans. Creutzfeldt-Jakob disease (CJD), Gerstmann-Straussler-Scheinker syndrome, and fatal familial insomnia represent the more common human phenotypes. Excluding the small number of iatrogenically transmitted cases, approximately 85% to 90% of patients develop CJD without identifiable explanation, with an increasing number of different mutations in the prion protein gene (PRNP) recognized as probably causative in the remainder.To report on an 82-year-old woman with pathologically confirmed CJD found unexpectedly to harbor a novel mutation in PRNP.Routine clinical investigations were undertaken to elucidate the cause of the rapidly progressive dementia and neurological decline manifested by the patient, including magnetic resonance imaging of the brain, electroencephalography, and cerebrospinal fluid analysis for the 14-3-3 beta protein. Standard postmortem neuropathological examination of the brain was performed, including immunocytochemistry of representative sections to detect the prion protein. Posthumous genetic analysis of the open reading frame of PRNP was performed on frozen brain tissue using polymerase chain reaction and direct sequencing.Concomitant with the exclusion of alternative diagnoses, the presence of characteristic periodic sharp-wave complexes on the electroencephalogram in combination with a positive result for 14-3-3 beta protein in the cerebrospinal fluid led to a confident clinical diagnosis of CJD, confirmed at autopsy. There was no family history of dementia or similar neurological illness, but patrilineal medical information was incomplete. Unexpectedly, full sequencing of the PRNP open reading frame revealed a single novel mutation consisting of an adenine-to-guanine substitution at nucleotide 611, causing alanine to replace threonine at codon 188.In addition to expanding the range of PRNP mutations associated with human prion diseases, we believe this case is important for the following reasons. First, from an epidemiological perspective, the avoidance of occasional incorrect classification of patients manifesting neurodegenerative disorders that may have a genetic basis requires systematic genotyping, particularly when there are uncertainties regarding the family history. Second, the incidence of spongiform encephalopathy in elderly patients beyond the typical age range may be underestimated and does not preclude a genetic basis. Finally, as a corollary, this case highlights problematic issues in human transmissible spongiform encephalopathies, as illustrated by disease penetrance and age of onset in genotype-phenotype correlations." @default.
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• W1983144164 date "2000-07-01" @default.
• W1983144164 modified "2023-10-14" @default.
• W1983144164 title "Novel Prion Protein Gene Mutation in an Octogenarian With Creutzfeldt-Jakob Disease" @default.
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• W1983144164 doi "https://doi.org/10.1001/archneur.57.7.1058" @default.
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