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Measuring genome divergence in bacteria: a case study using chlamydian data.

Daniel A Dalevi1, Niklas Eriksen, Kimmo Eriksson

  • 1Department of Molecular Evolution, University of Uppsala, Norbyvagen 18C, SE-751 36, Uppsala, Sweden.

Journal of Molecular Evolution
|August 8, 2002
PubMed
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Genomic rearrangements, including transpositions and inversions, significantly shaped the evolution of Chlamydia species. Horizontal gene transfer was found to be infrequent after species divergence.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Chlamydia trachomatis and Chlamydia pneumoniae are significant human pathogens.
  • Understanding their evolutionary mechanisms is crucial for public health.

Purpose of the Study:

  • To quantify the contribution of different genomic events to the divergence of Chlamydia trachomatis and Chlamydia pneumoniae.
  • To assess the role of horizontal gene transfer in their recent evolution.

Main Methods:

  • Comparative genomics to analyze gene order and content.
  • Statistical modeling to compare nucleotide frequencies.
  • Simulations to estimate amelioration rates of potential foreign genes.

Main Results:

Related Experiment Videos

  • An estimated 59 +/- 6 rearrangement events, dominated by transpositions (49%) and inversions (13% large, 38% short), differentiate the genomes.
  • No significant evidence for horizontal gene transfer after species divergence was found.
  • Nucleotide substitution rates were estimated at 1.42 per site at fourfold degenerate sites.

    • Conclusions:

    • Genomic rearrangements are the primary drivers of Chlamydia species evolution.
    • Horizontal gene transfer plays a minimal role in the recent evolutionary history of these species.