Prion diseases

Area of Science:

• Neuroscience
• Infectious Diseases
• Molecular Biology

Background:

• Prion diseases are fatal neurodegenerative disorders affecting the nervous system.
• They are caused by a pathogenic isoform of the prion protein, a normal cell membrane constituent.
• Creutzfeldt-Jakob disease (CJD) is the most common human prion disease.

Purpose of the Study:

• To review the modes of transmission and risk factors associated with human and animal prion diseases.
• To highlight the challenges in assessing and predicting the spread of prion diseases.
• To understand the implications of prion protein's pathogenic isoform.

Main Methods:

• Review of scientific literature on prion diseases.
• Analysis of transmission routes in human and animal prionopathies.
• Examination of factors influencing disease spread and risk.

Main Results:

• Human prion diseases include sporadic CJD, inherited forms, and iatrogenic transmission.
• Consumption of infected material is linked to kuru and variant CJD.
• Animal prion diseases like BSE and CWD are transmitted via contact or feed.

Conclusions:

• Prion disease transmission routes are diverse, including sporadic, inherited, iatrogenic, and consumption-based.
• Animal prion diseases spread through direct contact or contaminated feed.
• Variable transmission, species barriers, infectivity distribution, and strain variations complicate risk assessment and future predictions.