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Notes on the history of the prion diseases. Part II
1Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA. cposer@caregroup.harvard.edu
Abstract:
The protein-only theory of transmission of the prion diseases remains controversial. Other mechanisms such as the virus, virino, and viroid hypotheses are still under consideration. All these fit in the concept of 'slow' infections that had been proposed in 1954 by Bjorn Sigurdsson, an Icelandic pathologist. Regardless of the exact mode of infection, the presence of prions in the brain has served to unite Creutzfeldt-Jakob disease (CJD), the Gerstmann-Sträussler-Scheinker syndrome and fatal familial insomnia, as well as scrapie and a number of other animal diseases, into a single pathological entity, the transmissible spongiform encephalopathies. The appearance of bovine spongiform encephalopathy in the United Kingdom and its putative relationship to new variant CJD, have put a new and unpredictable light on these unusual and uncommon diseases.
Insights
The protein-only theory for prion diseases is debated, with alternative slow infection mechanisms still explored. Prions unite various human and animal brain diseases under transmissible spongiform encephalopathies.
Area of Science:
- Neurology
- Pathology
- Infectious Diseases
Background:
- The transmission mechanism of prion diseases remains a subject of scientific debate.
- Alternative hypotheses, including viral, virino, and viroid theories, are considered alongside the protein-only prion hypothesis.
- These concepts align with Bjorn Sigurdsson's 1954 proposal of 'slow' infections.
Observation:
- The presence of prions in the brain is a unifying factor for several neurodegenerative disorders.
- Diseases such as Creutzfeldt-Jakob disease (CJD), Gerstmann-Sträussler-Scheinker syndrome, and fatal familial insomnia share common pathological features.
- Animal diseases like scrapie are also categorized under this umbrella.
Findings:
- Prions link a spectrum of human and animal diseases into a single pathological classification: transmissible spongiform encephalopathies (TSEs).
- The emergence of bovine spongiform encephalopathy (BSE) in the UK and its potential link to new variant CJD have heightened interest in these conditions.
Implications:
- Understanding prion diseases is crucial for public health, particularly concerning potential zoonotic transmission.
- Further research into the exact transmission mechanisms of TSEs is warranted.
- The study of prions impacts our understanding of neurodegeneration and infectious disease.