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Related Experiment Videos

Search for a scrapie-specific nucleic acid: a progress report.

B Oesch1, D F Groth, S B Prusiner

  • 1Institut für Molekulabiologie I, Universität Zürich, CH-8093.

Ciba Foundation Symposium
|January 1, 1988
PubMed
Summary

Researchers investigated the scrapie agent, searching for a specific nucleic acid. While most tested clones showed contamination, a few unidentified clones may represent scrapie-specific genetic material.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Virology

Background:

  • The scrapie agent, responsible for a transmissible spongiform encephalopathy, is composed of a protein (PrPSc) and potentially an informational molecule.
  • Distinct scrapie strains suggest the presence of genetic material, possibly a nucleic acid encoding infectivity.
  • The normal prion protein (PrPC) and the disease-associated PrPSc isoform likely arise from post-translational modifications of a single prion protein (PrP) gene product.

Purpose of the Study:

  • To identify and isolate potential scrapie-specific nucleic acids associated with the infectious agent.
  • To differentiate between contamination and genuine scrapie-related genetic material.

Main Methods:

  • Purification of the scrapie agent to enrich for the protease-resistant PrPSc protein.

Related Experiment Videos

  • In vitro synthesis of complementary DNA (cDNA) from isolated nucleic acids using random primers.
  • Screening of cDNA clones for scrapie-specific sequences using hybridization techniques with globin and hamster repetitive sequence probes.

    • Main Results:

    • A small number of cDNA clones (four out of 150) did not hybridize to the globin probe.
    • Two of these four clones showed hybridization to hamster repetitive sequences, indicating potential contamination.
    • The remaining clones, not related to known hamster nucleic acids, could represent novel scrapie-specific genetic material or unknown contaminants.

    Conclusions:

    • The study did not definitively identify scrapie-specific nucleic acids but provided a method for their potential isolation.
    • The findings suggest that if a nucleic acid component exists, it is present in very low abundance or is highly divergent from known sequences.
    • Further characterization of the unidentified clones is necessary to determine their origin and relevance to scrapie infectivity.