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Microbial gene transfer: an ecological perspective.

J H Paul1

  • 1Department of Marine Science, University of South Florida, St. Petersburg 33701, USA. jpaul@seas.marine.usf.edu

Journal of Molecular Microbiology and Biotechnology
|August 15, 2000
PubMed
Summary
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Microbial gene transfer, or microbial sex, drives evolution by exchanging genetic material. This process, once thought a lab artifact, is now recognized as a significant force shaping microbial life and phylogenies.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Microbial gene transfer, termed microbial sex, facilitates genetic exchange among prokaryotes and eukaryotes.
  • Historically considered a laboratory artifact, recent evidence highlights its role as a major evolutionary driver in natural microbial populations.
  • Genome sequencing reveals microbial genomes are mosaics of ancestral and recently acquired genes.

Purpose of the Study:

  • To investigate the significance of microbial gene transfer as a driving force in microbial evolution.
  • To explore novel methods for studying in situ gene transfer frequencies.
  • To analyze the impact of gene transfer on microbial phylogenies.

Main Methods:

  • Studies involve introducing traceable genes into natural communities or using model recipients to capture transferred genes.

Related Experiment Videos

  • Novel in situ methods utilize green fluorescent protein (GFP)-marked plasmids for epifluorescence microscopy detection.
  • Analysis of complete microbial genomes, including archaeal and eukaryotic genomes, to identify transferred genes.

    • Main Results:

    • Gene transfer significantly impacts microbial populations and evolutionary trajectories.
    • New methods, like GFP-marked plasmids and viral-like particle transduction, offer improved detection of gene transfer.
    • Genome data shows extensive horizontal gene transfer, with archaeal genomes exhibiting eukaryotic replication/transcription genes and bacterial metabolism genes, and eukaryotes incorporating bacterial genes.

    Conclusions:

    • Microbial gene transfer is a crucial mechanism for genetic dispersal and shaping microbial evolution.
    • The study underscores the importance of horizontal gene transfer in the early evolution and ongoing diversification of life.
    • Understanding microbial gene transfer is key to comprehending microbial adaptation and evolution.