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Related Experiment Videos

Horizontal gene transfer accelerates genome innovation and evolution.

Ravi Jain1, Maria C Rivera, Jonathan E Moore

  • 1Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA.

Molecular Biology and Evolution
|June 5, 2003
PubMed
Summary

Horizontal gene transfer (HGT) drives genetic diversity by enabling gene flow between species. Organisms with similar genome size, G/C composition, carbon use, and oxygen tolerance form exchange communities, facilitating HGT.

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Area of Science:

  • Genomics
  • Microbiology
  • Evolutionary Biology

Background:

  • Horizontal gene transfer (HGT) is a primary mechanism for spreading genetic diversity across species.
  • HGT accelerates genome innovation by introducing pre-evolved genes, bypassing de novo gene creation.
  • HGT is restricted to organisms within specific "exchange communities."

Purpose of the Study:

  • To define exchange communities in free-living prokaryotes.
  • To identify internal and external environmental factors regulating HGT.
  • To understand the genomic and metabolic characteristics that facilitate gene exchange.

Main Methods:

  • Analysis of approximately 20,000 genes from eight free-living prokaryotic genomes.
  • Comparative genomic analysis to identify shared characteristics among organisms involved in HGT.

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  • Correlation analysis between HGT prevalence and genomic features.

    • Main Results:

    • HGT occurs among prokaryotes sharing similar genomic and environmental factors.
    • Key factors influencing HGT include genome size, G/C composition, carbon utilization, and oxygen tolerance.
    • These shared factors define the boundaries of prokaryotic exchange communities.

    Conclusions:

    • Genome size, G/C composition, carbon utilization, and oxygen tolerance are critical determinants of HGT.
    • Understanding these factors is essential for defining exchange communities and predicting gene flow.
    • HGT facilitates rapid adaptation and evolution in prokaryotes by enabling efficient gene sharing.