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Defective interfering particles: effects in modulating virus growth and persistence

C R Bangham1, T B Kirkwood

  • 1Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.

Virology
|December 1, 1990
PubMed

Insights

Defective interfering particles (DIPs) dynamics in vitro are explained by a simple model. Initial infection levels of DIPs and passage timing critically determine virus and cell survival, without needing external factors.

Area of Science:

  • Virology
  • Cell Biology
  • Mathematical Modeling

Background:

  • Defective interfering particles (DIPs) are known to influence viral infections in vitro and in vivo.
  • Previous explanations for DIPs' behavior in vitro invoked external factors like interferon or cell mutations.
  • A need exists for a simplified model to understand DIPs' population dynamics.

Purpose of the Study:

  • To present a simple model explaining the in vitro growth dynamics of defective interfering particles (DIPs).
  • To demonstrate that DIPs' population dynamics can be understood without invoking extrinsic factors.
  • To identify key determinants of DIPs' infection outcomes in vitro.

Main Methods:

  • Development of a mathematical model for DIP growth dynamics.
  • Analysis of DIP population dynamics under varying initial multiplicities of infection.
  • Simulation of long-term in vitro cultures with different virus passage criteria.

Main Results:

  • The model successfully explains observed DIP population dynamics without external factors.
  • Initial multiplicity of infection is the primary factor influencing infection outcomes in vitro.
  • The timing of virus passage in long-term cultures dictates the survival of standard virus, DIPs, and host cells.

Conclusions:

  • A simple model adequately describes DIPs' in vitro growth and population dynamics.
  • Extrinsic factors are not necessary to explain DIPs' behavior in cell cultures.
  • The model provides a framework for predicting the in vitro behavior of other interfering viral mutants.

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