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Related Experiment Videos

Search for a prion-specific nucleic acid.

Jiri G Safar1, Klaus Kellings, Ana Serban

  • 1Institute for Neurodegenerative Diseases, University of California, San Francisco 94143-0518, USA.

Journal of Virology
|July 30, 2005
PubMed
Summary
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Researchers searched for a prion-specific nucleic acid, finding only short, host-encoded 25-nucleotide fragments. These findings suggest that nucleic acids are unlikely to be responsible for prion strain diversity.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Prion Biology

Background:

  • Prion strain diversity was historically attributed to an unknown nucleic acid component.
  • Decades of research have failed to identify a specific polynucleotide associated with prions.
  • Prions are infectious proteins implicated in neurodegenerative diseases.

Purpose of the Study:

  • To investigate the presence and size of nucleic acids within purified prion fractions.
  • To determine if any identified nucleic acids are specific to prions and could explain strain diversity.
  • To assess the role of nucleic acids in prion infectivity and strain characteristics.

Main Methods:

  • Purification of Sc237 prions from infected hamster brains.
  • Analysis of nucleic acid size using return refocusing electrophoresis (RRGE).

Related Experiment Videos

  • Quantification of prion particles and infectious units (ID50) after intracerebral inoculation and accounting for clearance.
  • Assessment of prion infectivity and strain properties after UV irradiation.

    • Main Results:

    • Purification removed nucleic acids larger than 50 nucleotides.
    • The largest polynucleotide present at one molecule per infectious unit was estimated to be approximately 25 nucleotides long.
    • Approximately 3,000 protease-resistant PrP(Sc) molecules were found per infectious unit.
    • UV irradiation reduced prion infectivity but did not alter strain-specific properties.

    Conclusions:

    • The identified 25-nucleotide polynucleotides are likely host-encoded and not prion-specific.
    • These findings challenge the hypothesis that nucleic acids are responsible for prion strain diversity.
    • The data suggest that prion infectivity and strain characteristics are primarily determined by the prion protein itself.