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Related Experiment Videos

Extremely low frequency magnetic fields affect transposition activity in Escherichia coli.

B Del Re1, F Garoia, P Mesirca

  • 1Department of Evolutionary Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy.

Radiation and Environmental Biophysics
|May 28, 2003
PubMed
Summary

Extremely low frequency (ELF) magnetic fields (MF) significantly reduce bacterial transposition activity. This effect on DNA transposition in E. coli was dose-dependent on MF intensity.

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Area of Science:

  • Molecular Biology
  • Environmental Science
  • Biophysics

Background:

  • Environmental stressors like heat shock and UV irradiation can influence cellular processes.
  • Transposition activity is a key mechanism for genetic variation and adaptation in bacteria.
  • Understanding factors affecting transposition is crucial for microbial genetics.

Purpose of the Study:

  • To investigate the impact of extremely low frequency (ELF) magnetic fields (MF) on bacterial transposition.
  • To compare the effects of MF exposure to known environmental stress factors.
  • To determine if MF exposure influences transposition activity in Escherichia coli.

Main Methods:

  • Utilized an Escherichia coli Lac Z(-) strain engineered with a plasmid for transposition detection.

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  • Assessed transposition events by quantifying dark-colored papillae (Lac Z(+)) formation in colonies.
  • Exposed bacteria to a 50 Hz, low-intensity MF (0.1-1 mT) for 58 hours, comparing to sham-exposed controls.

    • Main Results:

    • Bacteria exposed to ELF MF exhibited significantly reduced transposition activity compared to controls.
    • A positive correlation was observed between MF intensity and the reduction in transposition activity (dose-effect).
    • Bacterial cell proliferation, colony number, diameter, and perimeter remained unaffected by MF exposure.

    Conclusions:

    • Extremely low frequency magnetic fields can inhibit bacterial transposition activity.
    • The observed effect is dependent on the intensity of the magnetic field.
    • MF exposure does not appear to impact bacterial growth or proliferation rates.