[Unconventional transmissible agents and prion protein: is something still missing?]

Area of Science:

• Neuroscience
• Molecular Biology
• Infectious Diseases

Context:

• Prion diseases are rare, fatal neurodegenerative disorders.
• They involve the accumulation of abnormal prion protein (PrPSc) in the central nervous system.
• No conventional infectious agent has been isolated from affected brains.

Purpose:

• To explore the nature of prions as transmissible agents.
• To understand the role of the prion protein (PrP) in disease susceptibility and propagation.
• To investigate the structural basis of prion strains.

Summary:

• Prion diseases result from a conformational change of the normal cellular prion protein (PrPc) into an abnormal, protease-resistant form (PrPSc).
• This abnormal PrPSc is believed to be the infectious agent, propagating by inducing conformational changes in normal PrPc.
• Host susceptibility and incubation periods are influenced by the primary structure of PrP, with specific amino acid substitutions linked to disease progression.

Impact:

• Prion diseases represent a novel class of transmissible disorders where information is encoded in protein structure, not nucleic acids.
• Understanding PrP structure and function is crucial for developing diagnostics and therapeutics.
• This research challenges traditional views of infectious agents and opens new avenues in neurodegenerative disease research.