Prions: The Puzzling Proteins
Definition:
Proteinaceous infectious particles, or prions, are a novel class of infectious agent mainly consisting of misfolded proteins. They defy convention by lacking genetic material such as DNA or RNA.Distinctions from Viruses:
- Genetic Material Void: Unlike viruses, prions challenge the conventional reliance on genetic material for replication by being nucleic acid-free.
Agents of Infection with Proteins: Prions are infectious proteins that cause normal cellular proteins to misfold; unlike viruses, they lack genetic material.
Structural Components:
- Proteins That Are Not Correctly Folded: The cellular prion protein (PrP) is one of the host proteins that are misfolded in prions.
- Diseases Caused:
- Neurodegenerative Havoc: Prions are notorious culprits behind fatal neurodegenerative diseases in humans and animals, including Creutzfeldt-Jakob Disease (CJD) and Mad Cow Disease.
Examples and Species:
- Human Prion Diseases: Notable examples include CJD, Gerstmann-Sträussler-Scheinker syndrome (GSS), and Fatal Familial Insomnia (FFI).
- Animal Prion Diseases: Prominent cases involve Bovine Spongiform Encephalopathy (BSE) in cattle and Scrapie in sheep.
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