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Updated: Jun 11, 2025

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Flagellar motility is mutagenic.

Souvik Bhattacharyya1, Shelby Lopez1, Abhyudai Singh2

  • 1Department of Molecular Biosciences, LaMontagne Center for Infectious Diseases, University of Texas at Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 2024
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Bacterial flagella, while crucial for survival, increase mutation rates due to their high energy demands. This suggests flagellar motility significantly influences the pace of bacterial evolution.

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E. colievolutionflagellamutation

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Flagella are complex molecular machines enabling bacterial motility, essential for survival, competitiveness, and virulence.
  • Flagellar motility is energetically expensive, consuming approximately 10% of a cell's energy budget.
  • The impact of flagellar motility on the rate of bacterial evolution is not well understood.

Purpose of the Study:

  • To investigate the direct influence of flagellar motility on bacterial mutation rates.
  • To determine if flagellar production and operation costs affect evolutionary rates.

Main Methods:

  • The study likely involved analyzing mutation rates in bacteria with and without functional flagella.
  • Quantitative assessments of energy expenditure for flagellar biosynthesis and rotation were probably conducted.

Main Results:

  • Both the production (biosynthesis) and operation (rotation) of flagella were found to contribute to elevated mutation rates.
  • The energy-intensive nature of flagellar systems appears to be linked to increased genetic variation.

Conclusions:

  • Flagellar motility, despite its benefits, imposes a cost that elevates bacterial mutation rates.
  • Flagellar movement may be a key factor in regulating the speed of bacterial evolution.