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Bacillus thuringiensis conjugation in simulated microgravity.

Elise Beuls1, Rob Van Houdt, Natalie Leys

  • 1Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, Louvain-la-Neuve, Belgium.

Astrobiology
|October 23, 2009
PubMed
Summary
This summary is machine-generated.

Simulated microgravity did not affect plasmid transfer in Bacillus thuringiensis, a Gram-positive bacterium. This suggests bacteria can still exchange genetic material, relevant for antibiotic resistance and virulence, even in space.

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Area of Science:

  • Microbiology
  • Space Biology
  • Genetics

Background:

  • Spaceflight may influence microbial genetic exchange, with prior studies suggesting microgravity affects Gram-positive bacteria differently than Gram-negative.
  • Understanding plasmid transfer in microgravity is crucial for assessing risks associated with bacterial virulence and antibiotic resistance spread.

Purpose of the Study:

  • To investigate the effect of simulated microgravity on plasmid transfer in Bacillus thuringiensis using ground-based models.
  • To compare plasmid transfer frequencies under simulated microgravity (0 g) versus normal gravity (1 g).

Main Methods:

  • Utilized three microgravity simulators: Rotating Wall Vessel (RWV), Random Positioning Machine (RPM), and a superconducting magnet.
  • Assessed transfer frequencies of conjugative plasmid pAW63 and mobilization of pUB110 between B. thuringiensis strains under simulated microgravity and 1 g conditions.

Main Results:

  • No statistically significant difference was found in plasmid transfer frequencies between simulated microgravity conditions and standard 1 g laboratory conditions.
  • Neither stimulation nor inhibition of plasmid transfer was observed in Bacillus thuringiensis under simulated weightlessness.

Conclusions:

  • Ground-based simulations indicate that microgravity does not impede or enhance plasmid transfer in Gram-positive bacteria like B. thuringiensis.
  • The ability of bacteria to exchange plasmids in weightlessness, similar to Earth conditions, has implications for the spread of antibiotic resistance and virulence factors in space environments.