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Related Experiment Videos

Bacterial regulatory networks are extremely flexible in evolution.

Irma Lozada-Chávez1, Sarath Chandra Janga, Julio Collado-Vides

  • 1Programa de Genomica Computacional, Centro de Ciencias Genomicas, Universidad Nacional Autonoma de Mexico, Apdo. Postal 565-A, Avenue Universidad, Cuernavaca, Morelos, 62100 Mexico, Mexico. ilozada@ccg.unam.mx [corrected]

Nucleic Acids Research
|July 15, 2006
PubMed
Summary

Bacterial transcriptional regulatory networks (TRNs) show remarkable plasticity. Transcription factors (TFs) evolve rapidly, driving TRN evolution and enabling adaptation to diverse environments.

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Area of Science:

  • * Evolutionary Biology
  • * Genomics
  • * Systems Biology

Background:

  • * Bacterial transcriptional regulatory networks (TRNs) are crucial for adaptation to diverse environments.
  • * Understanding TRN plasticity is key to comprehending bacterial evolution.
  • * Escherichia coli K12 and Bacillus subtilis are model organisms for studying TRNs.

Purpose of the Study:

  • * To investigate the conservation of TRNs across Bacteria, Archaea, and Eukarya.
  • * To analyze TRN conservation at the levels of individual components, interactions, and regulons.
  • * To identify the evolutionary drivers of TRN plasticity and bacterial adaptation.

Main Methods:

  • * Comparative genomic analysis of TRNs from Escherichia coli K12 and Bacillus subtilis.

Related Experiment Videos

  • * Examination of transcription factors (TFs) and target genes (TGs) across different phylogenetic domains.
  • * Assessment of the conservation of individual components, interaction pairs, and regulons.

    • Main Results:

    • * Transcription factors (TFs) evolve significantly faster than target genes (TGs).
    • * Global regulators are poorly conserved, indicating TFs are key to TRN plasticity.
    • * A small fraction of transcriptional regulatory interactions are conserved across bacterial phyla.
    • * Most bacterial regulons are rapidly lost, suggesting high flexibility in TRNs.

    Conclusions:

    • * Bacterial TRNs exhibit high flexibility and rapid evolution, primarily driven by transcription factors.
    • * Essential cellular processes show conserved transcriptional regulation during bacterial divergence.
    • * Transcriptional regulation is more flexible than the genetic component, influencing phenotypic adaptation.