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Scrapie strain variation and mutation

M E Bruce1

  • 1AFRC Neuropathogenesis Unit, Institute for Animal Health, Edinburgh, UK.

British Medical Bulletin
|October 1, 1993
PubMed
Summary
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Scrapie strains show distinct disease characteristics in mice, indicating an independent informational molecule. Host factors can select for faster-replicating variants, suggesting mutation in the scrapie agent.

Area of Science:

  • Prion biology
  • Neurodegenerative diseases
  • Molecular virology

Background:

  • Scrapie exhibits diverse strain characteristics in genetically defined mouse models.
  • Distinct scrapie strains isolated in the same mouse model suggest an independent informational molecule.
  • Strain properties remain stable during serial passage under consistent conditions.

Purpose of the Study:

  • To investigate the stability and potential for change in scrapie agent strains.
  • To explore the role of host factors in modulating scrapie strain properties.
  • To provide insights into the molecular nature of the scrapie agent and agent-host interactions.

Main Methods:

  • Serial passage of biologically cloned scrapie strains in genetically defined mice.

Related Experiment Videos

  • Transmission studies using natural scrapie and bovine spongiform encephalopathy (BSE) isolates.
  • Characterization of disease phenotypes in host animals.

    • Main Results:

    • Scrapie strain characteristics are generally stable during serial mouse passage.
    • Changes in host species or genotype can lead to alterations in strain properties.
    • These alterations are consistent with the selection of faster-replicating variants, suggesting mutation.
    • Field isolates of scrapie and BSE show evidence of strain variation.

    Conclusions:

    • The scrapie agent possesses an informational molecule independent of the host.
    • Host-induced changes in scrapie strains are likely due to selection of variants, not host modification.
    • Evidence supports mutation as a mechanism for scrapie agent variation.
    • Understanding strain variation is crucial for prion disease research and risk assessment.