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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Updated: Aug 1, 2025

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Evolutionary explanations for heterogeneous behavior in clonal bacterial populations.

Rolf Kümmerli1, Steven A Frank2

  • 1Department of Quantitative Biomedicine, University of Zürich, Zürich, Switzerland.

Trends in Microbiology
|April 28, 2023
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Summary

Bacterial populations show widespread cellular differences. We propose group-level traits and varying cell strength as new evolutionary reasons for this bacterial heterogeneity.

Keywords:
bet hedgingcellular heterogeneitydivision of laborgroup-level phenotypevariation in cellular vigor

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Bacterial Physiology

Background:

  • Cellular heterogeneity is common in clonal bacterial populations.
  • Existing explanations include division of labor and bet hedging.
  • The evolutionary drivers of this heterogeneity require further exploration.

Purpose of the Study:

  • To propose alternative evolutionary explanations for bacterial cellular heterogeneity.
  • To investigate the roles of group-level phenotypes and cellular vigor.

Main Methods:

  • Conceptual analysis of evolutionary mechanisms.
  • Review of existing literature on bacterial population dynamics.
  • Theoretical modeling of group-level trait evolution.

Main Results:

  • Identified group-level phenotypes mediated by shareable molecules as a potential driver.
  • Highlighted variation in cellular vigor as another alternative evolutionary explanation.
  • Challenged the sole reliance on division of labor and bet hedging.

Conclusions:

  • Bacterial cellular heterogeneity may arise from mechanisms beyond individual-level adaptation.
  • Group-level cooperation and variation in individual cell performance offer new perspectives.
  • These alternative explanations provide a broader framework for understanding bacterial evolution.