{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T16:25:24Z","timestamp":1787502324532,"version":"build-2736575974"},"reference-count":47,"publisher":"Oxford University Press (OUP)","issue":"10","license":[{"start":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T00:00:00Z","timestamp":1626652800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"Basic Science Research Program through the National Research Foundation of Korea"},{"name":"Ministry of Science and ICT","award":["2019R1A2C2004879"],"award-info":[{"award-number":["2019R1A2C2004879"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,9,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>Bacteria that acquire plasmids incur a biological cost. Despite this fact, clinical Enterobacteriaceae isolates commonly contain multiple co-existing plasmids harbouring carbapenemase genes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Six different plasmids carrying blaNDM-1, blaNDM-5, blaCTX-M-15, blaKPC-2, blaOXA-181 and blaOXA-232 genes were obtained from Klebsiella pneumoniae and Escherichia coli clinical isolates. Using the E. coli DH5\u03b1 strain as recipient, 14 transconjugants with diverse plasmid combinations (single or double plasmids) were generated. For each of these, the effects of plasmid carriage on the bacterial host were investigated using in vitro and in vivo competition assays; additionally, the effects were investigated in the context of biofilm formation, serum resistance and survival inside macrophages. Transcriptomic changes in single- and double-plasmid recipients were also investigated.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Increased in vitro and in vivo competitiveness was observed when two plasmids carrying blaNDM-1 and blaOXA-232 were co-introduced into the host bacteria. However, DH5\u03b1::pNDM5\u200a+\u200apOXA232 and other double-plasmid recipients did not show such competitiveness. DH5\u03b1::pNDM5\u200a+\u200apOXA181 did not show any fitness cost compared with a plasmid-free host and single-plasmid transconjugants, while both the double-plasmid recipients with pCTXM15 or pKPC2 exhibited a fitness burden. The double-plasmid recipient DH5\u03b1::pNDM1\u200a+\u200apOXA232 also exhibited increased biofilm formation, serum resistance and survival inside macrophages. Transcriptomic analysis revealed that the genes of DH5\u03b1::pNDM1\u200a+\u200apOXA232 involved in metabolic pathways, transport and stress response were up-regulated, while those involved in translation were down-regulated.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Our study suggests that bacterial strains can gain fitness through the acquisition of multiple plasmids harbouring antibiotic resistance genes, which may be mediated by transcriptomic changes in the chromosomal genes of the bacterial host.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/jac\/dkab240","type":"journal-article","created":{"date-parts":[[2021,6,24]],"date-time":"2021-06-24T15:12:21Z","timestamp":1624547541000},"page":"2528-2537","source":"Crossref","is-referenced-by-count":16,"title":["Effect of multiple, compatible plasmids on the fitness of the bacterial host by inducing 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