A single gene of a commensal microbe affects host susceptibility to enteric infection

Mi Young Yoon, Kyung Bae Min, Kang Mu Lee, Yujin Yoon, Yaeseul Kim, Young Taek Oh, Keehoon Lee, Jongsik Chun, Byung Yong Kim, Seok Hwan Yoon, Insuk Lee, Chan Yeong Kim, Sang Sun Yoon

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Abstract

Indigenous microbes inside the host intestine maintain a complex self-regulating community. The mechanisms by which gut microbes interact with intestinal pathogens remain largely unknown. Here we identify a commensal Escherichia coli strain whose expansion predisposes mice to infection by Vibrio cholerae, a human pathogen. We refer to this strain as 'atypical' E. coli (atEc) because of its inability to ferment lactose. The atEc strain is resistant to reactive oxygen species (ROS) and proliferates extensively in antibiotic-treated adult mice. V. cholerae infection is more severe in neonatal mice transplanted with atEc compared with those transplanted with a typical E. coli strain. Intestinal ROS levels are decreased in atEc-transplanted mice, favouring proliferation of ROS-sensitive V. cholerae. An atEc mutant defective in ROS degradation fails to facilitate V. cholerae infection when transplanted, suggesting that host infection susceptibility can be regulated by a single gene product of one particular commensal species.

Original languageEnglish
Article number11606
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 May 13

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Yoon, M. Y., Min, K. B., Lee, K. M., Yoon, Y., Kim, Y., Oh, Y. T., Lee, K., Chun, J., Kim, B. Y., Yoon, S. H., Lee, I., Kim, C. Y., & Yoon, S. S. (2016). A single gene of a commensal microbe affects host susceptibility to enteric infection. Nature communications, 7, [11606]. https://doi.org/10.1038/ncomms11606