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Modes of integration of heterologous plasmid DNA into the chromosome of Streptococcus pneumoniae.

ABSTRACT

We compared the efficiencies of two different processes that can direct integration of plasmids into chromosomes of recipient cells during transformation. A donor-recipient system was constructed to allow a single donor plasmid to use either flanking homology, involving an apparent double crossover, or the insertion duplication process that has been described as due to a "Campbell-like" single crossover between the chromosome and a circular duplex. The latter process gave 600-fold fewer insertions that did the former, confirming expectations from prior work showing that insertion of heterologous DNA by use of flanking homology is highly efficient. It has some advantages for cloning and mapping purposes and can be exploited once it is recognized.

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