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Evolutionary dynamics of transposable elements in prokaryotes and eukaryotes.

D A Hickey1

  • 1Department of Biology, University of Ottawa, Ontario, Canada.

Genetica
|January 1, 1992
PubMed
Summary

Sexual reproduction in eukaryotes facilitates the spread of transposable genetic elements (transposons). This evolutionary dynamic may even explain the origin of sex and the presence of introns.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular biology

Background:

  • Transposable genetic elements (transposons) are mobile DNA sequences.
  • Their abundance and evolution differ significantly between prokaryotes and eukaryotes.
  • Host reproductive biology plays a crucial role in transposon evolution.

Purpose of the Study:

  • To explore recent theories on transposable element evolution in sexual eukaryotes.
  • To explain variations in transposon abundance based on host reproductive strategies.
  • To investigate the potential role of transposons in the evolution of sexual reproduction and introns.

Main Methods:

  • Theoretical review and synthesis of existing research.
  • Comparative analysis of transposon dynamics in different organisms.
  • Argumentation based on evolutionary principles.

Main Results:

  • Transposon evolution is constrained by host genome reproductive biology.
  • Sexual outbreeding in mammals and plants strongly favors transposon proliferation.
  • Zygote formation, a hallmark of sexual reproduction, aids transposon spread.
  • Introns may have originated from transposable genetic elements.

Conclusions:

  • The reproductive mode of a host significantly impacts transposable element evolution.
  • Sexual reproduction's prevalence might be partly driven by selection on transposon-encoded genes.
  • Transposable elements offer a potential explanation for the origin of introns.

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