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Pathogenesis is often modelled using the PAO1 reference strain but laboratory lineages vary in the sequence and activity of MexT, a global regulator impacting virulence, biofilm formation, and ciprofloxacin resistance. We defined the impact of active versus inactive MexT in PAO1 and observed transcriptomic changes affecting the expression of ~900 genes. Phenotyping revealed altered metabolism, antibiotic resistance, and virulence, resulting in striking variation across a \u2018single\u2019 model organism. We propose that antibiotic resistance promotes plasticity in mexT accounting for variation across lineages. We introduced antibiotic resistance into clinical P. aeruginosa isolates and observed mutations in mexT when selective pressure was removed, supporting the proposed evolutionary pathway. Overall, we have demonstrated the transcriptomic basis of MexT as a phenotypic switch in PAO1 and implicated antibiotic resistance as a cause of changes in mexT. Furthermore, MexS\/MexT-regulated efflux is implicated in the antibiotic stress response and virulence, helping identify the mechanisms for rapid phenotypic switching through mexT and confirming that PAO1 is unlike most isolates. Improved understanding of the regulatory changes linked to antibiotic resistance is particularly relevant to P. aeruginosa where cycles of antibiotic treatment are common.<\/jats:p>","DOI":"10.1093\/femsmc\/xtag044","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T11:51:16Z","timestamp":1787226676000},"source":"Crossref","is-referenced-by-count":0,"title":["Plasticity in a bacterial global regulatory switch that drives a shift in antibiotic resistance and virulence"],"prefix":"10.1093","volume":"7","author":[{"given":"Annapaula","family":"Correia","sequence":"first","affiliation":[{"name":"Norwich Medical School, University of East Anglia , Norwich, NR4 7UQ ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emma J","family":"Manners","sequence":"additional","affiliation":[{"name":"Norwich Medical School, University of East Anglia , Norwich, NR4 7UQ ,","place":["United Kingdom"]},{"name":"European Molecular 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