Analysis of Prion Strains by PrPSc Profiling in Sporadic Creutzfeldt–Jakob Disease
Open Access
- 20 December 2005
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLoS Medicine
- Vol. 3 (2), e14
- https://doi.org/10.1371/journal.pmed.0030014
Abstract
Prion diseases are a group of invariably fatal neurodegenerative disorders affecting humans and a wide range of mammals. An essential part of the infectious agent, termed the prion, is composed of an abnormal isoform (PrPSc) of a host-encoded normal cellular protein (PrPC). The conversion of PrPC to PrPSc is thought to play a crucial role in the development of prion diseases and leads to PrPSc deposition, mainly in the central nervous system. Sporadic Creutzfeldt–Jakob disease (sCJD), the most common form of human prion disease, presents with a marked clinical heterogeneity. This diversity is accompanied by a molecular signature which can be defined by histological, biochemical, and genetic means. The molecular classification of sCJD is an important tool to aid in the understanding of underlying disease mechanisms and the development of therapy protocols. Comparability of classifications is hampered by disparity of applied methods and inter-observer variability. To overcome these difficulties, we developed a new quantification protocol for PrPSc by using internal standards on each Western blot, which allows for generation and direct comparison of individual PrPSc profiles. By studying PrPSc profiles and PrPSc type expression within nine defined central nervous system areas of 50 patients with sCJD, we were able to show distinct PrPSc distribution patterns in diverse subtypes of sCJD. Furthermore, we were able to demonstrate the co-existence of more than one PrPSc type in individuals with sCJD in about 20% of all patients and in more than 50% of patients heterozygous for a polymorphism on codon 129 of the gene encoding the prion protein (PRNP). PrPSc profiling represents a valuable tool for the molecular classification of human prion diseases and has important implications for their diagnosis by brain biopsy. Our results show that the co-existence of more than one PrPSc type might be influenced by genetic and brain region–specific determinants. These findings provide valuable insights into the generation of distinct PrPSc types.Keywords
This publication has 23 references indexed in Scilit:
- A common open representation of mass spectrometry data and its application to proteomics researchNature Biotechnology, 2004
- Predictors of survival in sporadic Creutzfeldt-Jakob disease and other human transmissible spongiform encephalopathiesBrain, 2004
- Identification of Distinct N-terminal Truncated Forms of Prion Protein in Different Creutzfeldt-Jakob Disease SubtypesPublished by Elsevier BV ,2004
- Effects of Different Experimental Conditions on the PrPSc Core Generated by Protease DigestionJournal of Biological Chemistry, 2004
- Conformational variations in an infectious protein determine prion strain differencesNature, 2004
- Classification of sporadic Creutzfeldt-Jakob disease based on molecular and phenotypic analysis of 300 subjectsAnnals of Neurology, 1999
- Improved electrophoretic separation and immunoblotting of beta‐amyloid (Aβ) peptides 1–40, 1–42, and 1–43Electrophoresis, 1997
- Evidence for the Conformation of the Pathologic Isoform of the Prion Protein Enciphering and Propagating Prion DiversityScience, 1996
- Molecular basis of phenotypic variability in sporadc creudeldt‐jakob diseaseAnnals of Neurology, 1996
- Replication of distinct scrapie prion isolates is region specific in brains of transgenic mice and hamsters.Genes & Development, 1992