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Arias-Andres, Maria; Klümper, Uli; Rojas-Jimenez, Keilor; Grossart, Hans-Peter
Environmental pollution (1987), June 2018, 2018-Jun, 2018-06-00, Letnik: 237Journal Article
Pollution by microplastics in aquatic ecosystems is accumulating at an unprecedented scale, emerging as a new surface for biofilm formation and gene exchange. In this study, we determined the permissiveness of aquatic bacteria towards a model antibiotic resistance plasmid, comparing communities that form biofilms on microplastics vs. those that are free-living. We used an exogenous and red-fluorescent E. coli donor strain to introduce the green-fluorescent broad-host-range plasmid pKJK5 which encodes for trimethoprim resistance. We demonstrate an increased frequency of plasmid transfer in bacteria associated with microplastics compared to bacteria that are free-living or in natural aggregates. Moreover, comparison of communities grown on polycarbonate filters showed that increased gene exchange occurs in a broad range of phylogenetically-diverse bacteria. Our results indicate horizontal gene transfer in this habitat could distinctly affect the ecology of aquatic microbial communities on a global scale. The spread of antibiotic resistance through microplastics could also have profound consequences for the evolution of aquatic bacteria and poses a neglected hazard for human health. Display omitted •Higher ratios of plasmid transfer in microplastic-associated bacteria than in free-living bacteria.•Gene exchange occurred in a broad range of phylogenetically-diverse bacteria.•Spread of antibiotic resistance through microplastics can affect aquatic ecology and evolution, but also human health. Increased horizontal gene transfer via microplastic particles.
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