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Related Experiment Videos

Transduction-like gene transfer in the methanogen Methanococcus voltae.

G Bertani1

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA. gbertani@lalc.k12.ca

Journal of Bacteriology
|May 13, 1999
PubMed
Summary

Methanococcus voltae spontaneously generates DNA fragments, termed voltae transfer agent (VTA), which genetically transform other cells. This process, similar to transduction, involves DNase-protected DNA and is efficient for various genetic markers.

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Area of Science:

  • Microbiology
  • Genetics
  • Archaea Research

Background:

  • Methanococcus voltae is a methanogenic, anaerobic archaebacterium.
  • Understanding genetic exchange mechanisms in archaea is crucial for microbial genetics.

Purpose of the Study:

  • To investigate the spontaneous generation of DNA fragments in M. voltae.
  • To characterize the genetic transformation activity of these fragments, termed voltae transfer agent (VTA).

Main Methods:

  • Culture filtration to prepare VTA.
  • Assessing VTA gene transfer efficiency for auxotrophic markers and drug resistance.
  • Restriction enzyme digestion (AluI) of VTA DNA.

Main Results:

  • M. voltae strain PS spontaneously produces 4.4-kbp DNase-protected DNA fragments (VTA).

Related Experiment Videos

  • VTA mediates genetic transformation of M. voltae for histidine, purine, cobalamin auxotrophies, and BES resistance.
  • VTA is rapidly inactivated upon storage and present at approximately two particles per cell.

    • Conclusions:

    • VTA mediates genetic transfer in M. voltae, functionally resembling generalized transduction.
    • The VTA DNA appears to be a random sample of chromosomal DNA, with a 0.9-kbp amplified sequence.
    • Evidence for intrinsically viral particles is currently lacking, and their existence is considered unlikely due to VTA DNA size.