A complete view of the genetic diversity of the Escherichia coli O-antigen biosynthesis gene cluster

Atsushi Iguchi, Sunao Iyoda, Taisei Kikuchi, Yoshitoshi Ogura, Keisuke Katsura, Makoto Ohnishi, Tetsuya Hayashi, Nicholas R. Thomson

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Abstract

The O antigen constitutes the outermost part of the lipopolysaccharide layer in Gram-negative bacteria. The chemical composition and structure of the O antigen show high levels of variation even within a single species revealing itself as serological diversity. Here, we present a complete sequence set for the O-antigen biosynthesis gene clusters (O-AGCs) from all 184 recognized Escherichia coli O serogroups. By comparing these sequences, we identified 161 well-defined O-AGCs. Based on the wzx/wzy or wzm/wzt gene sequences, in addition to 145 singletons, 37 serogroups were placed into 16 groups. Furthermore, phylogenetic analysis of all the E. coli O-serogroup reference strains revealed that the nearly one-quarter of the 184 serogroups were found in the ST10 lineage, which may have a unique genetic background allowing a more successful exchange of O-AGCs. Our data provide a complete view of the genetic diversity of O-AGCs in E. coli showing a stronger association between host phylogenetic lineage and O-serogroup diversification than previously recognized. These data will be a valuable basis for developing a systematic molecular O-typing scheme that will allow traditional typing approaches to be linked to genomic exploration of E. coli diversity.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalDNA Research
Volume22
Issue number1
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics

Cite this

Iguchi, A., Iyoda, S., Kikuchi, T., Ogura, Y., Katsura, K., Ohnishi, M., ... Thomson, N. R. (2015). A complete view of the genetic diversity of the Escherichia coli O-antigen biosynthesis gene cluster. DNA Research, 22(1), 101-107. https://doi.org/10.1093/dnares/dsu043