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Extrachromosomal elements of spirochetes.

S Bergström1, C F Garon, A G Barbour

  • 1Department of Microbiology, University of Umeå, Sweden.

Research in Microbiology
|July 1, 1992
PubMed
Summary
This summary is machine-generated.

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Spirochetes like Borrelia possess unique linear DNA, including minichromosomes with poxvirus-like sequences. Treponema species, lacking linear DNA, are being studied for virulence using plasmid cloning vehicles.

Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Spirochetes are a diverse group of pathogenic bacteria, including Treponema, Borrelia, and Leptospira.
  • Understanding spirochete virulence factors requires studying their genetic organization.

Purpose of the Study:

  • To investigate the genetic organization and virulence factors of spirochetes.
  • To analyze the unique genomic structures of Borrelia and Treponema.

Main Methods:

  • Genomic structural analysis of Borrelia.
  • Molecular characterization of Treponema denticola plasmids.
  • Sequence similarity analysis of linear minichromosomes.

Main Results:

  • Borrelia genomes feature a linear maxi-chromosome, linear minichromosomes, and circular plasmids.

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  • Borrelia minichromosomes exhibit sequence similarities to poxviruses and African swine fever virus.
  • Treponema lacks linear DNA; a 2.6-kb plasmid of Treponema denticola was characterized.

    • Conclusions:

    • Borrelia's unique linear DNA elements may play a role in virulence and DNA transfer.
    • Characterization of Treponema plasmids provides tools for studying genus-specific virulence.