Abstract
Horizontal gene transfer mediated by broad-host-range plasmids is an important mechanism of antibiotic resistance spread. While not all bacteria maintain plasmids equally well, plasmid persistence can improve over time, yet no general evolutionary mechanisms have emerged. Our goal was to identify these mechanisms and to assess if adaptation to one plasmid affects the permissiveness to others. We experimentally evolved Pseudomonas sp. H2 containing multidrug resistance plasmid RP4, determined plasmid persistence and cost using a joint experimental–modelling approach, resequenced evolved clones, and reconstructed key mutations. Plasmid persistence improved in fewer than 600 generations because the fitness cost turned into a benefit. Improved retention of naive plasmids indicated that the host evolved towards increased plasmid permissiveness. Key chromosomal mutations affected two accessory helicases and the RNA polymerase β-subunit. Our and other findings suggest that poor plasmid persistence can be caused by a high cost involving helicase–plasmid interactions that can be rapidly ameliorated.
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Acknowledgements
This work was supported by the National Institute of Allergy and Infectious Diseases grant R01 AI084918 of the National Institutes of Health (NIH). The genome resequencing was done by the IBEST Genomics Research Core and made possible thanks to an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences (NIGMS) of the NIH under grant number P30 GM103324. K.B. was in part supported by a University of Idaho Department of Biological Sciences undergraduate research grant and by an NIGMS INBRE award, grant number P20 GM103408. H.Q. was supported by a National Science Foundation REU Site award, 1460696. We thank the laboratory of C. Marx for providing us with vector pPS04 and we thank H. Merrikh for useful suggestions.
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W.L. and E.M.T conceived the project and wrote the manuscript. W.L., K.B., H.Q., K.D., M.K.T. and J.M. performed the experiments. W.L. and J.M.P. performed the statistical analyses. W.L. and S.H. performed the bioinformatic analysis. H.M. facilitated part of the work and helped with data interpretation.
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Loftie-Eaton, W., Bashford, K., Quinn, H. et al. Compensatory mutations improve general permissiveness to antibiotic resistance plasmids. Nat Ecol Evol 1, 1354–1363 (2017). https://doi.org/10.1038/s41559-017-0243-2
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DOI: https://doi.org/10.1038/s41559-017-0243-2
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