Abstract
Genetic analysis of Myxococcus xanthus is greatly facilitated by the ability to introduce cloned DNA into M. xanthus to generate gene replacement and merodiploid strains. However, gene replacement strains are difficult to obtain when the region(s) of homology between the cloned DNA and the M. xanthus chromosome is limited (less than 1 kilobase). We found that gene replacements can be obtained at an increased frequency by a two-step procedure involving the use of bacteriophage P1 to isolate merodiploid strains followed by generalized transduction to another M. xanthus strain by using phage Mx4.
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