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Assessing Transmissible Spongiform Encephalopathy Species Barriers with an In Vitro Prion Protein Conversion Assay
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Elements modulating the prion species barrier and its passage consequences.

Juan-Maria Torres1, Juan-Carlos Espinosa1, Patricia Aguilar-Calvo1

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|March 11, 2014
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Summary

Transmissible Spongiform Encephalopathy (TSE) strains, like Bovine Spongiform Encephalopathy (BSE), show minimal changes after crossing species barriers. BSE agents remain infectious and adaptable, highlighting risks for new species, including humans.

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Area of Science:

  • Veterinary Medicine
  • Neuroscience
  • Molecular Biology

Background:

  • Transmissible Spongiform Encephalopathy (TSE) strains can change when passing between species.
  • Bovine Spongiform Encephalopathy (BSE) is a significant prion disease with implications for animal and human health.

Purpose of the Study:

  • To investigate how BSE agent characteristics change after transmission across species.
  • To compare BSE with other prions in natural and transgenic hosts.
  • To understand the factors influencing prion transmission barriers.

Main Methods:

  • Transmission of BSE and non-BSE prions to cattle, sheep, pigs, mice, and transgenic mice expressing different prion protein (PrP) sequences.
  • Biochemical analysis of accumulated PrPSc.
  • Biological assessment of transmission barriers.

Main Results:

  • BSE agent properties remained largely unchanged after passage in various hosts.
  • Slight biochemical modifications in PrPSc were reversible.
  • BSE agents showed weak or no transmission barriers in transgenic mice, unlike non-BSE prions.
  • Prion transmission barriers depend on strain properties, not solely PrP sequence identity.

Conclusions:

  • The BSE agent is highly adaptable and can readily infect new species, including humans.
  • Species barrier effects are primarily governed by host PrPC sequence and prion strain properties.
  • Findings are crucial for accurate BSE risk assessment.