Abstract
Recombination between plasmid molecules, each containing a nonoverlapping deletion mutation in the hamster adenine phosphoribosyltransferase gene, was measured after coinjection into rat cells. Using these two plasmids, as linear or circular molecules, the recombination efficiency was measured soon after injection in a transient expression assay or after selection for stable transformants. The transient assay revealed that linear molecules were a better substrate for recombination, with double strand breaks within the region of homology stimulating recombination more than breaks outside the region of homology. A 20 to 70-fold increase in the efficiency of recombination was observed when two linear molecules were coinjected as compared to two circular molecules. Linear molecules were found to not only stimulate recombination but also to facilitate stable integration of the recombinant molecule into the host genome.
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Wong, E.A., Capecchi, M.R. Analysis of homologous recombination in cultured mammalian cells in transient expression and stable transformation assays. Somat Cell Mol Genet 12, 63–72 (1986). https://doi.org/10.1007/BF01560728
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DOI: https://doi.org/10.1007/BF01560728