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Related Experiment Videos

DNA exchange and insertional inactivation in spirochetes.

K Tilly1, A F Elias, J L Bono

  • 1Laboratory of Human Bacterial Pathogenesis, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, Montana, USA.

Journal of Molecular Microbiology and Biotechnology
|November 15, 2000
PubMed
Summary

Gene inactivation in spirochetes, particularly Borrelia burgdorferi, is advancing. Optimal electrotransformation requires specific bacterial growth phases, DNA amounts, and field strengths for successful genetic manipulation.

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Area of Science:

  • Microbiology
  • Genetics
  • Pathogen Research

Background:

  • Spirochetes are significant pathogens with complex life cycles, yet their genetic manipulation remains underdeveloped.
  • Gene inactivation has been demonstrated in key spirochete species, including Borrelia burgdorferi, Brachyspira hyodysenteriae, and Treponema denticola.

Purpose of the Study:

  • To review existing methods for gene inactivation and DNA exchange in spirochetes.
  • To focus on the genetic manipulation of Borrelia burgdorferi, the causative agent of Lyme disease.
  • To identify factors influencing electrotransformation efficiency in Borrelia burgdorferi.

Main Methods:

  • Review of published literature on spirochete gene inactivation and DNA exchange techniques.
  • Analysis of factors affecting electrotransformation in Borrelia burgdorferi, including bacterial growth phase, DNA quantity, and electrical field strength.

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Main Results:

  • Optimal electrotransformation of Borrelia burgdorferi is achieved using log-phase bacteria, substantial DNA concentrations (up to 50 microg), and high field strengths (12.5–37.5 kV/cm).
  • Infectious Borrelia burgdorferi isolates exhibit transformation frequencies 100-fold lower than high-passage, non-infectious strains.
  • Bacterial surface characteristics, often linked to infectivity, present challenges for efficient electroporation.

Conclusions:

  • Established protocols can facilitate gene inactivation and DNA exchange in spirochetes, with a focus on Borrelia burgdorferi.
  • Understanding and overcoming barriers related to bacterial surface properties is crucial for improving transformation efficiency in infectious strains.