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Clostridium difficile Genome Editing Using pyrE Alleles.

Muhammad Ehsaan1, Sarah A Kuehne1,2, Nigel P Minton3,4

  • 1Clostridia Research Group, BBSRC/EPSRC Synthetic Biology Research Centre (SBRC), School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.

Methods in Molecular Biology (Clifton, N.J.)
|August 11, 2016
PubMed
Summary
This summary is machine-generated.

Precise genome editing in Clostridium difficile is achieved using a two-stage method with counterselection markers. This approach facilitates targeted gene modifications and complements mutations efficiently without antibiotic selection.

Keywords:
Allele-coupled exchange (ACE)Allelic exchangeClostridium difficileComplementationCounterselection markerOverexpressionPseudo-suicidecodApyrE

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Clostridium difficile is a significant human pathogen.
  • Precise genetic manipulation is crucial for understanding C. difficile virulence and developing therapeutics.
  • Existing genome editing methods can be inefficient or introduce unwanted genetic changes.

Purpose of the Study:

  • To develop a robust and efficient method for precise genome engineering in Clostridium difficile.
  • To evaluate the efficacy of different counterselection markers for genome manipulation.
  • To establish a system for rapid complementation of generated mutants.

Main Methods:

  • A two-stage genetic manipulation strategy involving single-crossover integration and double-crossover excision.
  • Utilizing replication-defective plasmids with counterselection markers, specifically codA (cytosine deaminase) or pyrE (orotate phosphoribosyltransferase).
  • Employing allele-coupled exchange (ACE) vectors for simultaneous mutant complementation and marker restoration in a pyrE mutant host.

Main Results:

  • Demonstrated successful precise in-frame deletions and substitutions in the Clostridium difficile genome.
  • Both codA and pyrE counterselection markers proved effective.
  • The pyrE mutant host system with ACE vectors enabled efficient complementation and avoided plasmid-associated phenotypic effects and antibiotic dependency.

Conclusions:

  • The described two-stage genome editing system provides a reliable method for precise genetic manipulation of Clostridium difficile.
  • The use of pyrE as a counterselection marker in conjunction with ACE vectors offers significant advantages for mutant generation and complementation.
  • This methodology streamlines the study of C. difficile genetics and facilitates the development of novel control strategies.