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Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK
Shiga-toxin-producing Escherichia coli (STEC) O157:H7 is a recently emerged zoonotic pathogen with considerable morbidity. Since the emergence of this serotype in the 1980s, research has focussed on unravelling the evolutionary events from the E. coli O55:H7 ancestor to the contemporaneous globally...
Autores principales: | , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Society for General Microbiology
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320567/ https://www.ncbi.nlm.nih.gov/pubmed/28348814 http://dx.doi.org/10.1099/mgen.0.000029 |
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author | Dallman, Timothy J. Ashton, Philip M. Byrne, Lisa Perry, Neil T. Petrovska, Liljana Ellis, Richard Allison, Lesley Hanson, Mary Holmes, Anne Gunn, George J. Chase-Topping, Margo E. Woolhouse, Mark E. J. Grant, Kathie A. Gally, David L. Wain, John Jenkins, Claire |
author_facet | Dallman, Timothy J. Ashton, Philip M. Byrne, Lisa Perry, Neil T. Petrovska, Liljana Ellis, Richard Allison, Lesley Hanson, Mary Holmes, Anne Gunn, George J. Chase-Topping, Margo E. Woolhouse, Mark E. J. Grant, Kathie A. Gally, David L. Wain, John Jenkins, Claire |
author_sort | Dallman, Timothy J. |
collection | PubMed |
description | Shiga-toxin-producing Escherichia coli (STEC) O157:H7 is a recently emerged zoonotic pathogen with considerable morbidity. Since the emergence of this serotype in the 1980s, research has focussed on unravelling the evolutionary events from the E. coli O55:H7 ancestor to the contemporaneous globally dispersed strains observed today. In this study, the genomes of over 1000 isolates from both human clinical cases and cattle, spanning the history of STEC O157:H7 in the UK, were sequenced. Phylogenetic analysis revealed the ancestry, key acquisition events and global context of the strains. Dated phylogenies estimated the time to evolution of the most recent common ancestor of the current circulating global clone to be 175 years ago. This event was followed by rapid diversification. We show the acquisition of specific virulence determinates has occurred relatively recently and coincides with its recent detection in the human population. We used clinical outcome data from 493 cases of STEC O157:H7 to assess the relative risk of severe disease including haemolytic uraemic syndrome from each of the defined clades in the population and show the dramatic effect Shiga toxin repertoire has on virulence. We describe two strain replacement events that have occurred in the cattle population in the UK over the last 30 years, one resulting in a highly virulent strain that has accounted for the majority of clinical cases in the UK over the last decade. There is a need to understand the selection pressures maintaining Shiga-toxin-encoding bacteriophages in the ruminant reservoir and the study affirms the requirement for close surveillance of this pathogen in both ruminant and human populations. |
format | Online Article Text |
id | pubmed-5320567 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Society for General Microbiology |
record_format | MEDLINE/PubMed |
spelling | pubmed-53205672017-03-27 Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK Dallman, Timothy J. Ashton, Philip M. Byrne, Lisa Perry, Neil T. Petrovska, Liljana Ellis, Richard Allison, Lesley Hanson, Mary Holmes, Anne Gunn, George J. Chase-Topping, Margo E. Woolhouse, Mark E. J. Grant, Kathie A. Gally, David L. Wain, John Jenkins, Claire Microb Genom Research Paper Shiga-toxin-producing Escherichia coli (STEC) O157:H7 is a recently emerged zoonotic pathogen with considerable morbidity. Since the emergence of this serotype in the 1980s, research has focussed on unravelling the evolutionary events from the E. coli O55:H7 ancestor to the contemporaneous globally dispersed strains observed today. In this study, the genomes of over 1000 isolates from both human clinical cases and cattle, spanning the history of STEC O157:H7 in the UK, were sequenced. Phylogenetic analysis revealed the ancestry, key acquisition events and global context of the strains. Dated phylogenies estimated the time to evolution of the most recent common ancestor of the current circulating global clone to be 175 years ago. This event was followed by rapid diversification. We show the acquisition of specific virulence determinates has occurred relatively recently and coincides with its recent detection in the human population. We used clinical outcome data from 493 cases of STEC O157:H7 to assess the relative risk of severe disease including haemolytic uraemic syndrome from each of the defined clades in the population and show the dramatic effect Shiga toxin repertoire has on virulence. We describe two strain replacement events that have occurred in the cattle population in the UK over the last 30 years, one resulting in a highly virulent strain that has accounted for the majority of clinical cases in the UK over the last decade. There is a need to understand the selection pressures maintaining Shiga-toxin-encoding bacteriophages in the ruminant reservoir and the study affirms the requirement for close surveillance of this pathogen in both ruminant and human populations. Society for General Microbiology 2015-09-14 /pmc/articles/PMC5320567/ /pubmed/28348814 http://dx.doi.org/10.1099/mgen.0.000029 Text en © 2015 The Authors http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Research Paper Dallman, Timothy J. Ashton, Philip M. Byrne, Lisa Perry, Neil T. Petrovska, Liljana Ellis, Richard Allison, Lesley Hanson, Mary Holmes, Anne Gunn, George J. Chase-Topping, Margo E. Woolhouse, Mark E. J. Grant, Kathie A. Gally, David L. Wain, John Jenkins, Claire Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title | Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title_full | Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title_fullStr | Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title_full_unstemmed | Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title_short | Applying phylogenomics to understand the emergence of Shiga-toxin-producing Escherichia coli O157:H7 strains causing severe human disease in the UK |
title_sort | applying phylogenomics to understand the emergence of shiga-toxin-producing escherichia coli o157:h7 strains causing severe human disease in the uk |
topic | Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320567/ https://www.ncbi.nlm.nih.gov/pubmed/28348814 http://dx.doi.org/10.1099/mgen.0.000029 |
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