Microplastic pollution increases gene exchange in aquatic ecosystems


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Bibliographic Details
Authors: Arias Andrés, María de Jesús, Klümper, Uli, Rojas Jiménez, Keilor Osvaldo, Grossart, Hans-Peter
Format: artículo original
Publication Date:2018
Description: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.
Institution:Universidad de Costa Rica
OAI Identifier:oai:https://www.kerwa.ucr.ac.cr:10669/81675
Online Access:https://www.sciencedirect.com/science/article/abs/pii/S0269749117349990?via%3Dihub
Access Level:acceso abierto
Aquatic ecosystems
Horizontal gene transfer
Antibiotic resistance