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Laboratory diagnosis of variant Creutzfeldt-Jakob disease
J W Ironside1, M W Head, J E Bell
1Departments of Pathology, Clinical Neurosciences, CJD Surveillance Unit, University of Edinburgh, Western General Hospital, Edinburgh, UK. J.W.Ironside@ed.ac.uk
Insights
Variant Creutzfeldt-Jakob disease (vCJD) exhibits distinct neuropathological and biochemical features compared to other Creutzfeldt-Jakob disease (CJD) types. All vCJD cases analyzed were methionine homozygotes, with widespread PrP accumulation in lymphoid tissues.
Area of Science:
- Neuropathology
- Biochemistry
- Prion Diseases
Background:
- Creutzfeldt-Jakob disease (CJD) surveillance is crucial for understanding prion diseases.
- Variant Creutzfeldt-Jakob disease (vCJD) is a distinct form of CJD with specific characteristics.
- Distinguishing vCJD from sporadic CJD is important for public health.
Purpose of the Study:
- To analyze the neuropathological and biochemical features of vCJD cases.
- To compare vCJD findings with other CJD cases.
- To investigate the association of vCJD with specific genetic markers.
Main Methods:
- Morphological studies of central nervous system and lymphoid tissues.
- Immunocytochemistry and Western blot analysis of PrPSc.
- Analysis of clinical and genetic data, including PrP gene codon 129 polymorphism.
Main Results:
- vCJD showed distinct morphological and immunocytochemical characteristics compared to other CJD cases.
- PrP accumulation was widespread in lymphoid tissues of vCJD patients, but not other non-neural tissues.
- vCJD brain tissue exhibited a uniform PrPSc glycotype pattern, distinct from sporadic CJD; all vCJD cases were methionine homozygotes at codon 129.
Conclusions:
- vCJD has unique pathological and biochemical profiles.
- The methionine homozygote genotype at codon 129 is a consistent feature of vCJD.
- Further surveillance is needed to rule out potential links between CJD in MV/VV genotypes and bovine spongiform encephalopathy (BSE).
Abstract:
The neuropathological and biochemical features of 33 cases of variant Creutzfeldt-Jakob disease (vCJD) diagnosed up to the end of 1998 are analysed in relation to the 646 cases of suspected CJD referred to the CJD Surveillance Unit laboratory from 1990 to 1998. Morphological studies of the central nervous system, lymphoid tissues and other organs were accompanied by immunocytochemistry; Western blot analysis of PrPRES was performed on frozen brain tissue. The findings were analysed in relation to clinical and genetic data. The pathology of vCJD showed morphological and immunocytochemical characteristics distinct from other cases of CJD. PrP accumulation was widespread in lymphoid tissues in vCJD, but was not identified in other non-neural tissues. PrPRES accumulation in vCJD brain tissue showed a uniform glycotype pattern distinct from sporadic CJD. All analysed cases of vCJD were methionine homozygotes at codon 129 of the PrP gene. No evidence currently exists to suggest that cases of CJD diagnosed in individuals who are MV or VV at codon 129 of the PrP gene represent 'human bovine spongiform encaphalopathy (BSE)'. Continued surveillance is required to further investigate this possibility, with the need to investigate autopsy tissues from suspected cases by histological and biochemical techniques.