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Related Experiment Videos

Linear plasmids and chromosomes in bacteria

J Hinnebusch1, K Tilly

  • 1Laboratory of Vectors and Pathogens, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, Montana 59840.

Molecular Microbiology
|December 1, 1993
PubMed
Summary
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Linear DNA, once thought rare in prokaryotes, is now found in various bacteria. These linear elements, including plasmids and chromosomes, have unique structures and may originate from genetic exchange with eukaryotes.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Linear DNA structures, including plasmids and chromosomes, were historically considered rare in prokaryotes.
  • Recent discoveries have identified linear DNA in diverse bacterial groups such as spirochaetes, Gram-positive, and Gram-negative bacteria.

Purpose of the Study:

  • To characterize the structural diversity of linear DNA elements in bacteria.
  • To explore the prevalence and potential origins of linear DNA in prokaryotic organisms.

Main Methods:

  • Characterization of two distinct structural types of bacterial linear DNA.
  • Comparative analysis of linear DNA structures in prokaryotes and eukaryotes.

Main Results:

  • Two primary structural types of bacterial linear DNA have been identified: hairpin loops in Borrelia plasmids and covalently attached proteins in Streptomyces plasmids.

Related Experiment Videos

  • Linear genomic structures appear more common in bacteria than previously assumed, with potential interconversion between circular and linear forms.
  • The molecular biology of these elements suggests possible genetic exchange between prokaryotes and eukaryotes.

    • Conclusions:

    • Linear DNA elements are more widespread in bacteria than previously recognized.
    • The structural diversity and potential interconversion of bacterial DNA forms challenge traditional views.
    • Evidence suggests a role for horizontal gene transfer in the origin of bacterial linear DNA.