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Related Experiment Videos

Senescence can explain microbial persistence.

I Klapper1,2, P Gilbert3, B P Ayati4

  • 1Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA.

Microbiology (Reading, England)
|November 3, 2007
PubMed
Summary
This summary is machine-generated.

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Bacterial persister cells, which survive antibiotic treatments, may be explained by senescence, not just phenotypic variation. This age-related process naturally accounts for how persister fractions change with growth conditions.

Area of Science:

  • Microbiology
  • Mathematical Biology
  • Bacterial Physiology

Background:

  • Bacterial populations contain a small fraction of persister cells that survive antimicrobial treatments.
  • These persister cells are generally considered phenotypic variants, not genetic mutants.
  • Existing models propose that cells can reversibly switch into and out of the persister state.

Purpose of the Study:

  • To propose senescence as an alternative explanation for bacterial persistence.
  • To investigate if an age-structured mathematical model can explain persistence phenomena.

Main Methods:

  • Development of a mathematical model incorporating age structure.
  • Analysis of the model to explain bacterial persistence.

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Main Results:

  • The senescence model naturally explains bacterial persistence phenomena.
  • The model accounts for the observed dependence of the persister fraction on growth phase in batch cultures.
  • The model also explains the dependence of the persister fraction on dilution rate in continuous cultures.

Conclusions:

  • Senescence offers a plausible and natural explanation for bacterial persistence.
  • Age structure is a key factor in understanding bacterial survival strategies.
  • Mathematical modeling provides valuable insights into bacterial physiology and resistance mechanisms.