Role of short regions of homology in intermolecular illegitimate recombination events.
The structures of three recombinants between bacteriophage lambda DNA and plasmid pBR322 that were generated in a recA derivative of Escherichia coli are described. Each resulted from two illegitimate recombination events that resulted in the substitution of part of the lambda genome by part of the plasmid genome. The nucleotide sequences at the six lambda-plasmid junctions were determined and compared with the sequences of the lambda and plasmid genomes before recombination. Each recombination occurred at a short region of homology in the two genomes, and other short regions of homology were found near some of the junctions. The structures of these junctions are similar to those resulting from illegitimate recombination in animal cells. A model to explain how these multiple illegitimate recombination events could result from a cascade of DNA gyrase-catalyzed recombinations is discussed.
25 references, click to expand
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