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Multicopy plasmid modification with phage lambda Red recombineering.

Lynn C Thomason1, Nina Costantino, Dana V Shaw

  • 1Gene Regulation and Chromosome Biology Laboratory, Building 539, Room 243, National Cancer Institute at Frederick, Frederick, MD 21702, USA. lthomason@ncifcrf.gov

Plasmid
|April 17, 2007
PubMed
Summary
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Recombineering enables versatile in vivo genetic engineering of plasmids, mirroring chromosomal modification capabilities. This method efficiently creates point mutations, deletions, and substitutions in multicopy plasmids.

Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Synthetic Biology

Background:

  • Bacteriophage lambda Red system facilitates in vivo genetic engineering.
  • pBR322 is a widely used multicopy plasmid vector.
  • Genetic manipulation of plasmids is crucial for molecular biology research.

Purpose of the Study:

  • To investigate the efficacy of recombineering for modifying multicopy plasmids.
  • To compare plasmid modification frequencies with chromosomal engineering.
  • To characterize the outcomes of plasmid recombineering.

Main Methods:

  • Utilized recombineering with the bacteriophage lambda Red system.
  • Applied genetic engineering techniques to a pBR322-derived multicopy plasmid.
  • Analyzed plasmid modifications including point mutations, deletions, and substitutions.

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Main Results:

  • Recombineering successfully introduced diverse genetic modifications to multicopy plasmids.
  • Modification frequencies were comparable to those observed for bacterial artificial chromosomes (BACs) and the E. coli chromosome.
  • Point mutations occurred at 5-10% unselected frequency.
  • Plasmid populations often contained mixtures of parental and recombinant molecules.
  • Circular multimeric plasmid molecules were frequently generated.

Conclusions:

  • Recombineering is a powerful tool for in vivo genetic engineering of multicopy plasmids.
  • The method offers broad applicability, enabling complex genetic alterations.
  • Understanding plasmid mixture dynamics and multimer formation is important for downstream applications.