Escherichia coli plasmidome maps the game of clones
Arredondo-Alonso, S.; Pontinen, A. K.; Gama, J.; Gladstone, R. A.; Harms, K.; Tonkin-Hill, G.; Thorpe, H. A.; Simonsen, G. S.; Samuelsen, O.; Johnsen, P. J.; Corander, J.
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Escherichia coli is the most widely studied microbe in history, but its extrachromosomal elements known as plasmids remain poorly delineated. Here we used long-read technology to high-resolution sequence the entire plasmidome and the corresponding host chromosomes from an unbiased longitudinal survey covering two decades and over 2,000 E. coli isolates. We find that some plasmids have persisted in lineages even for centuries, demonstrating strong plasmid-lineage associations. Our analysis provides a detailed map of recent vertical and horizontal evolutionary events involving plasmids with key antibiotic resistance, competition and virulence determinants. We present genomic evidence of both chromosomal and plasmid-driven success strategies that represent convergent phenotypic evolution in distant lineages, and use in vitro experiments to verify the importance of bacteriocin-producing plasmids for clone success. Our study has general implications for understanding plasmid biology and bacterial evolutionary strategies.
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