Molecular barriers to zoonotic transmission of prions

Area of Science:

• Neuroscience
• Infectious Diseases
• Molecular Biology

Background:

• Prion diseases are fatal neurodegenerative disorders.
• The conversion of normal prion protein (PrP) to its misfolded isoform is central to prion disease pathogenesis.
• Assessing the zoonotic risk of animal prion diseases is challenging.

Purpose of the Study:

• To evaluate the potential of various animal prion diseases to infect humans.
• To determine if different animal prion strains can convert human prion protein (HuPrP).

Main Methods:

• Utilized the protein misfolding cyclic amplification (PMCA) assay, a rapid molecular conversion technique.
• Tested brain homogenates from animals with classical bovine spongiform encephalopathy (BSE), atypical BSE (H-type and L-type), classical scrapie, atypical scrapie, and chronic wasting disease (CWD).
• Assessed the efficiency of these animal prion isolates in converting normal human prion protein.

Main Results:

• Classical BSE was the most efficient in converting human prion protein among the tested isolates.
• While less efficient than classical BSE, chronic wasting disease isolates demonstrated a potential for human prion protein conversion.
• No absolute barrier was observed for chronic wasting disease in converting human prion protein.

Conclusions:

• The study highlights the potential zoonotic risk of certain animal prion diseases, particularly chronic wasting disease.
• The findings underscore the importance of continued surveillance and research into interspecies prion transmission.
• Understanding prion conversion efficiency is crucial for assessing and mitigating public health risks associated with animal prion diseases.