Abstract
Transfer of an allele from a donor DNA to a recipient DNA molecule was selected by the loss of a dominant conditional lethal mutation previously incorporated ito the gene of interest in the recipient DNA. Both the Escherichia coli chromosome and plasmids carrying E. coli genes were used successfully as donor molecules. Recipient molecules for these exchanges were constructed in vitro by using the rpsL gene, which confers sensitivity to streptomycin, to replace segments of specific E. coli genes located either on multicopy plasmids or in the E. coli chromosome. Plasmids carrying such replacements were capable of acquiring chromosomal alleles of the gene(s) of interest, and strains carrying rpsL replacements in the chromosome were capable of acquiring plasmid-encoded alleles at the sight of the rpsL replacement. In both situations, these allele transfers resulted in loss of the rpsL gene from the recipient DNA molecule. The desired transfer events constituted a large percentage of these events, which gave rise to viable colonies when appropriate donor-recipient pairs were subjected to streptomycin selection. Thus, this is a useful approach for transferring alleles of interest from plasmids to the E. coli chromosome and vice versa.
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Selected References
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