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Investigation of horizontal gene transfer of pathogenicity islands in Escherichia coli using next-generation sequencing

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  • Maxim Messerer
  • Wolfgang Fischer
  • Sören Schubert

Abstract

Horizontal gene transfer (HGT) contributes to the evolution of bacteria. All extraintestinal pathogenic Escherichia coli (ExPEC) harbour pathogenicity islands (PAIs), however relatively little is known about the acquisition of these PAIs. Due to these islands, ExPEC have properties to colonize and invade its hosts efficiently. Even though these PAIs are known to be acquired by HGT, only very few PAIs do carry mobilization and transfer genes required for the transmission by HGT. In this study, we apply for the first time next-generation sequencing (NGS) and in silico analyses in combination with in vitro experiments to decipher the mechanisms of PAI acquisition in ExPEC. For this, we investigated three neighbouring E. coli PAIs, namely the high-pathogenicity island (HPI), the pks and the serU island. As these PAIs contain no mobilization and transfer genes, they are immobile and dependent on transfer vehicles. By whole genome sequencing of the entire E. coli reference (ECOR) collection and by applying a phylogenetic approach we could unambiguously demonstrate that these PAIs are transmitted not only vertically, but also horizontally. Furthermore, we could prove in silico that distinct groups of PAIs were transferred "en bloc" in conjunction with the neighbouring chromosomal backbone. We traced this PAI transfer in vitro using an F' plasmid. Different lengths of transferred DNA were exactly detectable in the sequenced transconjugants indicating NGS as a powerful tool for determination of PAI transfer.

Suggested Citation

  • Maxim Messerer & Wolfgang Fischer & Sören Schubert, 2017. "Investigation of horizontal gene transfer of pathogenicity islands in Escherichia coli using next-generation sequencing," PLOS ONE, Public Library of Science, vol. 12(7), pages 1-17, July.
    • Handle: RePEc:plo:pone00:0179880
    DOI: 10.1371/journal.pone.0179880
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    References listed on IDEAS

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    1. John W. Beaber & Bianca Hochhut & Matthew K. Waldor, 2004. "SOS response promotes horizontal dissemination of antibiotic resistance genes," Nature, Nature, vol. 427(6969), pages 72-74, January.
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