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Related Experiment Videos

Nonautonomous transposable elements in prokaryotes and eukaryotes.

D L Hartl1, E R Lozovskaya, J G Lawrence

  • 1Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110.

Genetica
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Nonautonomous transposable elements are rare in prokaryotes due to horizontal transmission and coupled transcription-translation. These factors likely prevent their long-term maintenance and limit regulatory roles in prokaryotic genomes.

Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Nonautonomous transposable elements (TEs) are common in eukaryotes but rare in prokaryotes.
  • Nonautonomous TEs are DNA-based (nonretroviral) and may regulate transposition.
  • Their lower frequency in prokaryotes suggests specific evolutionary pressures.

Purpose of the Study:

  • To investigate the reasons for the lower frequency of nonautonomous TEs in prokaryotes.
  • To explore the potential regulatory roles of nonautonomous TEs in prokaryotic transposition.
  • To understand the evolutionary maintenance of TEs in prokaryotic genomes.

Main Methods:

  • Comparative genomic analysis of TE frequencies in prokaryotes and eukaryotes.
  • Theoretical modeling of transposition regulation under prokaryotic cellular conditions.

Related Experiment Videos

  • Analysis of selection pressures acting on mobile genetic elements in prokaryotes.

    • Main Results:

    • Plasmid-mediated horizontal transmission in prokaryotes selects against nonautonomous TEs.
    • Coupled transcription-translation in prokaryotes favors cis-activation of transposition.
    • This cis-bias hinders the long-term maintenance of nonautonomous TEs and limits their trans-regulatory potential.

    Conclusions:

    • Prokaryotic biology presents significant challenges to the maintenance and function of nonautonomous TEs.
    • Horizontal transmission and cis-regulatory bias are key factors limiting their prevalence.
    • Nonautonomous TEs are unlikely to play significant regulatory roles in prokaryotes compared to eukaryotes.