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- W3133789091 abstract "Abstract Background IS26 plays a major role in the dissemination of antibiotic resistance determinants in Gram-negative bacteria. Objectives To determine whether insertion sequence IS26 is able to move alone (simple transposition) or if it exclusively forms cointegrates. Methods A two-step PCR using outward-facing primers was used to search for circular IS26 molecules. Gibson assembly was used to clone a synthetic IS26 containing a catA1 chloramphenicol resistance gene downstream of the tnp26 transposase gene into pUC19. IS activity in a recA−Escherichia coli containing the non-conjugative pUC19-derived IS26::catA1 construct and the conjugative plasmid R388 was detected using a standard mating-out assay. Transconjugants were screened for resistance. Results Circular IS26 molecules that would form with a copy-out route were not detected by PCR. The synthetic IS26::catA1 construct formed CmRTpR transconjugants (where CmR and TpR stand for chloramphenicol resistant and trimethoprim resistant, respectively), representing an R388 derivative carrying the catA1 gene at a frequency of 5.6 × 10−7 CmRTpR transconjugants per TpR transconjugant, which is comparable to the copy-in activity of the unaltered IS26. To test for simple transposition of IS26::catA1 (without the plasmid backbone), 1200 CmRTpR colonies were screened and all were resistant to ampicillin, indicating that the pUC19 backbone was present. Hence, IS26::catA1 had only formed cointegrates. Conclusions IS26 is unable to move alone and cointegrates are the exclusive end products of the reactions mediated by the IS26 transposase Tnp26. Consequently, when describing the formation of complex resistance regions, simple ‘transposition’ of a single IS26 should not be invoked." @default.
- W3133789091 created "2021-03-15" @default.
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- W3133789091 date "2021-03-04" @default.
- W3133789091 modified "2023-10-03" @default.
- W3133789091 title "IS<i>26</i>cannot move alone" @default.
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- W3133789091 doi "https://doi.org/10.1093/jac/dkab055" @default.
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