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Waddington's Landscapes in the Bacterial World.

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Summary

Bacterial cells exhibit phenotypic variation, akin to Waddington's epigenetic landscape, enabling adaptation through heritable epigenetic states. This heterogeneity aids survival in unpredictable environments via division of labor or bet hedging strategies.

Keywords:
DNA methylationbistabilitylineage formationnoisephenotypic heterogeneity

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Area of Science:

  • Microbiology
  • Developmental Biology
  • Genetics

Background:

  • Conrad Waddington's epigenetic landscape metaphor is applicable to bacterial phenotypic variation.
  • Bacterial differentiation with morphological changes is well-documented.
  • Phenotypic variants lacking morphological changes are increasingly revealed by single-cell technologies.

Purpose of the Study:

  • To explore the applicability of the epigenetic landscape concept to bacterial phenotypic variation.
  • To discuss the mechanisms and adaptive significance of heritable epigenetic states in bacteria.
  • To highlight the role of phenotypic heterogeneity in bacterial adaptation.

Main Methods:

  • Conceptual application of Waddington's epigenetic landscape model.
  • Review of existing literature on bacterial differentiation and phenotypic variation.
  • Analysis of single-cell technologies and gene expression patterns.
  • Game theory predictions on phenotypic heterogeneity.

Main Results:

  • Bacterial phenotypic variants, including those without morphological changes, can be visualized using the epigenetic landscape.
  • Heritable epigenetic states in bacteria arise from diverse mechanisms, from simple feedback loops to DNA methylation.
  • Phenotypic heterogeneity in bacterial populations can be a programmed or random event.
  • Experimental evidence supports game theory predictions of phenotypic heterogeneity for adaptation.

Conclusions:

  • The epigenetic landscape provides a useful framework for understanding bacterial phenotypic variation and adaptation.
  • Heritable epigenetic mechanisms contribute to bacterial resilience and survival in changing environments.
  • Phenotypic heterogeneity is a key evolutionary strategy for bacteria facing environmental challenges.