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Related Experiment Videos

Evolutionary genomics of ecological specialization.

Shaobin Zhong1, Arkady Khodursky, Daniel E Dykhuizen

  • 1BioTechnology Institute, University of Minnesota, St. Paul, MN 55108, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 4, 2004
PubMed
Summary

Genomic evolution in Escherichia coli shows reproducible patterns of adaptation to sugars. Specific gene duplications and mutations lead to ecological specialists, hindering the evolution of generalists due to trade-offs.

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Area of Science:

  • Microbial evolution
  • Genomics
  • Bacterial adaptation

Background:

  • Escherichia coli's adaptation to different carbon sources is a model for evolutionary processes.
  • Understanding genetic changes during adaptation provides insights into evolutionary constraints.

Purpose of the Study:

  • To investigate the genomic changes during Escherichia coli adaptation to lactulose, methyl-galactoside, or a mixture of both.
  • To determine the reproducibility and specificity of mutations conferring sugar utilization.
  • To explore the evolutionary trade-offs that may limit the development of generalist strains.

Main Methods:

  • Genomic analysis using DNA microarrays and PCR sequencing.
  • Monitoring chromosomal evolution over hundreds of generations in chemostat experiments.

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  • Statistical analysis to identify specific adaptations and their reproducibility.

    • Main Results:

    • Identified 8 unique duplications and 16 unique deletions, often associated with insertion sequences.
    • Demonstrated highly reproducible patterns of genomic evolution across replicate experiments.
    • Found that duplications at lac are specific to lactulose, and mgl mutations are specific to methyl-galactoside.
    • Observed that adaptation to mixed sugars involves similar mutations but in different genetic backgrounds, creating specialists.
    • Evidence suggests an antagonistic pleiotropic trade-off between lac duplications and mgl mutations.

    Conclusions:

    • The genomic evolution of Escherichia coli in response to specific sugars is highly predictable.
    • Antagonistic pleiotropy between key adaptive mutations likely promotes ecological specialization and hinders the evolution of generalist strains.
    • Adaptations to the chemostat environment are distinct from sugar-specific adaptations.