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Inferring bacterial cell size dynamics across media conditions.

César Nieto1, Claudia Igler2,3, Abhyudai Singh4

  • 1Department of Electrical and Computer Engineering, University of Delaware, Newark, 19716, USA. cnieto@udel.edu.

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Summary
This summary is machine-generated.

Bacterial cell size regulation is influenced by nutrient availability. Escherichia coli and Salmonella enterica show similar stationary phase cell sizes, with volume dynamics linked to growth media conditions and division rates.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Systems Biology

Background:

  • Bacteria maintain cell size homeostasis via coordinated elongation and division under stable conditions.
  • Nutrient availability dynamically regulates bacterial cell size by perturbing these homeostatic mechanisms.

Purpose of the Study:

  • To investigate bacterial cell volume changes throughout the population growth curve.
  • To understand how nutrient availability and growth media impact cell size regulation in Escherichia coli and Salmonella enterica.

Main Methods:

  • Microscopy imaging was employed to observe bacterial cell morphology.
  • Mathematical modeling was utilized to analyze cell volume dynamics and predict division rates.

Main Results:

  • Escherichia coli and Salmonella enterica exhibited similar cell volume distributions in stationary phase, regardless of growth media.
  • Resuspension in rich media led to a transient, media-dependent increase in cell volume, followed by a decrease to stationary phase levels.
  • Poor media conditions minimally affected cell volume but significantly decreased cell width.
  • Cell volume dynamics correlated with changes in the ratio of cell density to colony-forming units (CFU).

Conclusions:

  • Bacterial cell volume dynamics along the growth curve are influenced by nutrient availability and can be modeled using a time-varying division rate.
  • The findings provide insights into cell size regulation mechanisms in dynamic environments, applicable even without single-cell tracking.