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The bacterial transposon Tn7 is capable of high-frequency transposition to a specific site in the Escherichia coli chromosome, attTn7, and of low-frequency transposition to sites other than attTn7. Using an in vitro insertional mutagenesis procedure, we have identified and characterized five tns (Tn seven) genes that are essential for Tn7 transposition. Three of these genes, tnsA, tnsB, and tnsC, are required, but are not sufficient, for all Tn7 transposition events. In addition, tnsD is specifically required for transposition to attTn7, whereas tnsE is specifically required for transposition to other sites. Thus, Tn7 is an elaborate transposon that encodes two distinct but overlapping transposition pathways.

Tn7 transposition: two transposition pathways directed by five Tn7-encoded genes.