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Physicochemical and biological characterizations of distinct strains of the transmissible mink encephalopathy agent
1Department of Animal Health and Biomedical Sciences, University of Wisconsin, Madison 53706.
Abstract:
Inoculation of the Stetsonville, Wisconsin source of transmissible mink encephalopathy (TME) into Syrian hamsters has identified two strains of the TME agent having distinct biological properties and producing disease-specific prion proteins (PrPTME) having different physicochemical properties. Although several strains of the sheep scrapie agent have been identified in Great Britain, this is the first indication that agents producing transmissible spongiform encephalopathies in the United States also are capable of producing distinct strains.
Insights
Researchers identified two distinct strains of transmissible mink encephalopathy (TME) in hamsters. These TME strains produce unique prion proteins, marking the first evidence of distinct transmissible spongiform encephalopathy strains in the United States.
Area of Science:
- Neuroscience
- Veterinary Pathology
- Prion Disease Research
Background:
- Transmissible mink encephalopathy (TME) is a fatal prion disease affecting mink.
- Prion diseases are characterized by the misfolding of prion proteins (PrP).
- Distinct strains of prion diseases can exhibit different biological and pathological characteristics.
Purpose of the Study:
- To investigate the biological properties of the Stetsonville, Wisconsin TME agent.
- To determine if distinct strains of TME exist in the United States.
- To characterize the disease-specific prion proteins (PrPTME) associated with different TME strains.
Main Methods:
- Inoculation of Syrian hamsters with the Stetsonville TME agent.
- Observation and analysis of disease progression and clinical signs in inoculated hamsters.
- Biochemical and physicochemical characterization of the disease-specific prion proteins (PrPTME) produced.
Main Results:
- Two distinct strains of the TME agent were identified in Syrian hamsters.
- The identified TME strains exhibited different biological properties.
- Disease-specific prion proteins (PrPTME) from each strain showed different physicochemical properties.
- This represents the first evidence of distinct TME strains in the United States.
Conclusions:
- The TME agent can exist as distinct strains with varying biological and biochemical properties.
- The findings suggest a greater diversity of transmissible spongiform encephalopathy agents in the United States than previously recognized.
- Further research is needed to understand the implications of TME strain diversity for disease control and public health.