Published online 24 February 2005
Methods Online |
Simple and highly efficient BAC recombineering using galK selection
Mouse Cancer Genetics Program, National Cancer Institute Frederick, MD 21702-1201, USA 1 Gene Regulation and Chromosome Biology Laboratory, National Cancer Institute Frederick, MD 21702-1201, USA
*To whom correspondence should be addressed at Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, West 7th Street at Fort Detrick, Bldg 539, PO Box B, Frederick, MD 21702-1201, USA. Tel: +1 301 846 1260; Fax: +1 301 846 6666; Email: Copeland{at}ncifcrf.gov
Received January 11, 2005. Revised February 4, 2005. Accepted February 4, 2005.
Recombineering allows DNA cloned in Escherichia coli to be modified via lambda (
) Red-mediated homologous recombination, obviating the need for restriction enzymes and DNA ligases to modify DNA. Here, we describe the construction of three new recombineering strains (SW102, SW105 and SW106) that allow bacterial artificial chromosomes (BACs) to be modified using galK positive/negative selection. This two-step selection procedure allows DNA to be modified without introducing an unwanted selectable marker at the modification site. All three strains contain an otherwise complete galactose operon, except for a precise deletion of the galK gene, and a defective temperature-sensitive prophage that makes recombineering possible. SW105 and SW106 cells in addition carry L-arabinose-inducible Cre or Flp genes, respectively. The galK function can be selected both for and against. This feature greatly reduces the background seen in other negative-selection schemes, and galK selection is considerably more efficient than other related selection methods published. We also show how galK selection can be used to rapidly introduce point mutations, deletions and loxP sites into BAC DNA and thus facilitate functional studies of SNP and/or disease-causing point mutations, the identification of long-range regulatory elements and the construction of conditional targeting vectors.
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