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Genomic inversions in hyperthermophilic Archaea are driven by a mobile genetic element

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Area of Science:

  • Microbiology
  • Genetics
  • Evolutionary Biology

Background:

  • Genomic rearrangement is a key driver of organismal evolution.
  • Frequent large chromosomal inversions in Thermococcales hinder genome alignment.
  • The cause of these inversions, distinct from native recombination, is unknown.

Purpose of the Study:

  • To identify the mechanism behind frequent genomic inversions in Thermococcales.
  • To characterize the integrase enzyme from Thermococcus nautili plasmid pTN3.
  • To investigate the role of this integrase in catalyzing genomic rearrangements.

Main Methods:

  • Characterization of integrase activity in vitro and in vivo.
  • Analysis of recombination reactions with short DNA segments (104bp).
  • Serial culturing of Thermococcus nautili to observe genomic divergence rates.

Main Results:

  • The integrase from pTN3 catalyzes low sequence specificity recombination, mimicking homologous recombination.
  • This integrase mediates genomic inversions on short DNA segments.
  • Significant genomic divergence, including at least four large inversions, occurred in T. nautili within 60 generations.

Conclusions:

  • A mobile genetic element's integrase enzyme is proposed as the catalyst for genomic inversions in Thermococcales.
  • This integrase exhibits unusual low sequence specificity, enabling large-scale rearrangements.
  • Integrase activity drives rapid evolution and genomic divergence in this archaeal order, suggesting a selfish genetic element's role in evolution.