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Transcriptome evolution in Escherichia coli optimizes gene expression for thermal adaptation. This process maintains steady-state expression and environmental responsiveness during evolution.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Living systems optimize at genome and transcriptome levels.
  • Transcriptome evolution is understudied compared to genome evolution.
  • Understanding gene expression evolution is key to evolutionary mechanisms.

Purpose of the Study:

  • Analyze transcriptome evolution in Escherichia coli during long-term thermal adaptation.
  • Investigate how gene expression patterns change with temperature and genotype.

Main Methods:

  • Exponentially grew evolved and ancestor Escherichia coli strains at normal and high temperatures.
  • Performed transcriptome analysis on evolved and ancestor cells.
  • Utilized principal component analysis to assess transcriptome states.

Main Results:

  • Evolved and ancestor cells showed similar heat shock transcriptional responses.
  • Expression patterns differed during exponential growth at various temperatures.
  • Identified inverse transcriptional changes due to temperature and genotype differences.
  • Observed negative epistasis between genotype and heat shock responses.
  • Transcriptome evolution did not fully reach high-temperature responsive or regular-temperature steady states.

Conclusions:

  • Transcriptome evolution maintains steady-state gene expression during differentiation.
  • Maintains responsiveness to environmental stimuli and transcriptome homeostasis.
  • Suggests optimization of steady-state transcriptomes at high temperatures without compromising heat shock response.