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Plant transposons: contributors to evolution?

W E Lönnig1, H Saedler

  • 1Max-Planck-Institut für Züchtungsforschung, Köln, Germany. loennig@mpiz-koeln.mpg.de

Gene
|February 14, 1998
PubMed
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Transposable elements (TEs) in plants are viewed as either selfish DNA or useful genetic tools. This review explores their dual role in evolution, potentially driving species formation and adaptation.

Area of Science:

  • Genetics
  • Evolutionary Biology
  • Plant Science

Background:

  • Plant transposable elements (TEs) are debated as either evolutionary drivers or genetic burdens.
  • Hypotheses range from TEs as major evolutionary agents to them being primarily selfish DNA.

Purpose of the Study:

  • To review the dual assessment of transposable elements (TEs) in species origin (selfish vs. useful DNA).
  • To examine the role of gene function hierarchy and redundancy in TE activity.
  • To explore TE-induced species formation in angiosperms, considering systematic and genetic species concepts.

Main Methods:

  • Literature review and synthesis of existing research on transposable elements.
  • Analysis of case studies from Zea mays and Antirrhinum majus.
  • Discussion of theoretical frameworks for TE-driven evolution.

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Main Results:

  • TEs exhibit context-dependent roles, acting as selfish DNA in non-redundant genomic regions and sources of variation elsewhere.
  • Research in Zea mays and Antirrhinum majus highlights the contrast between artificial and natural selection in TE activity.
  • Potential synthesis areas include regressive evolution, ecotype, and cultivated plant origins.

Conclusions:

  • Transposable elements significantly contribute to genetic variability and species formation.
  • TE activity, particularly loss-of-function mutations, may explain the origin of many angiosperm morphospecies.
  • Reconciling systematic and genetic species concepts is crucial for understanding TE-induced speciation.