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A Discrete-Time Branching Process Model of Yeast Prion Curing Curves.

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Prion protein aggregates cause neurodegenerative diseases. In yeast, only smaller prion aggregates efficiently transmit between cells, influencing disease infectivity.

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Area of Science:

  • Neurobiology
  • Cell Biology
  • Biophysics

Background:

  • Prion diseases are linked to misfolded prion protein aggregates.
  • Cell-to-cell transmission of these aggregates is crucial for disease spread.
  • Previous studies suggest aggregate size influences prion transmission.

Purpose of the Study:

  • To model prion aggregate transmission dynamics in yeast.
  • To investigate the role of aggregate size in prion infectivity.
  • To determine how aggregate number affects strain infectivity.

Main Methods:

  • Developed a discrete-time branching process model.
  • Modeled prion aggregate growth using a Poisson process.
  • Incorporated a size threshold for aggregate transmission during cell division.

Main Results:

  • Prion aggregate size influences transmission efficiency.
  • A critical size threshold for transmission was identified.
  • The total number of transmissible aggregates impacts yeast colony infectivity.

Conclusions:

  • Aggregate size is a key factor in prion propagation.
  • Modeling provides insights into the mechanisms of prion disease transmission.
  • Understanding transmission dynamics can inform strategies against prion disorders.