Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti

ABSTRACT Prior to the epidemic that emerged in Haiti in October of 2010, cholera had not been documented in this country. After its introduction, a strain of Vibrio cholerae O1 spread rapidly throughout Haiti, where it caused over 600,000 cases of disease and >7,500 deaths in the first two years...

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Autores principales:	Lee S. Katz, Aaron Petkau, John Beaulaurier, Shaun Tyler, Elena S. Antonova, Maryann A. Turnsek, Yan Guo, Susana Wang, Ellen E. Paxinos, Fabini Orata, Lori M. Gladney, Steven Stroika, Jason P. Folster, Lori Rowe, Molly M. Freeman, Natalie Knox, Mike Frace, Jacques Boncy, Morag Graham, Brian K. Hammer, Yan Boucher, Ali Bashir, William P. Hanage, Gary Van Domselaar, Cheryl L. Tarr
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2013
Materias:	Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/eca35f0f8b1a42409063d3f3f98b9e45
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spelling	oai:doaj.org-article:eca35f0f8b1a42409063d3f3f98b9e452021-11-15T15:43:08ZEvolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti10.1128/mBio.00398-132150-7511https://doaj.org/article/eca35f0f8b1a42409063d3f3f98b9e452013-08-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00398-13https://doaj.org/toc/2150-7511ABSTRACT Prior to the epidemic that emerged in Haiti in October of 2010, cholera had not been documented in this country. After its introduction, a strain of Vibrio cholerae O1 spread rapidly throughout Haiti, where it caused over 600,000 cases of disease and >7,500 deaths in the first two years of the epidemic. We applied whole-genome sequencing to a temporal series of V. cholerae isolates from Haiti to gain insight into the mode and tempo of evolution in this isolated population of V. cholerae O1. Phylogenetic and Bayesian analyses supported the hypothesis that all isolates in the sample set diverged from a common ancestor within a time frame that is consistent with epidemiological observations. A pangenome analysis showed nearly homogeneous genomic content, with no evidence of gene acquisition among Haiti isolates. Nine nearly closed genomes assembled from continuous-long-read data showed evidence of genome rearrangements and supported the observation of no gene acquisition among isolates. Thus, intrinsic mutational processes can account for virtually all of the observed genetic polymorphism, with no demonstrable contribution from horizontal gene transfer (HGT). Consistent with this, the 12 Haiti isolates tested by laboratory HGT assays were severely impaired for transformation, although unlike previously characterized noncompetent V. cholerae isolates, each expressed hapR and possessed a functional quorum-sensing system. Continued monitoring of V. cholerae in Haiti will illuminate the processes influencing the origin and fate of genome variants, which will facilitate interpretation of genetic variation in future epidemics. IMPORTANCE Vibrio cholerae is the cause of substantial morbidity and mortality worldwide, with over three million cases of disease each year. An understanding of the mode and rate of evolutionary change is critical for proper interpretation of genome sequence data and attribution of outbreak sources. The Haiti epidemic provides an unprecedented opportunity to study an isolated, single-source outbreak of Vibrio cholerae O1 over an established time frame. By using multiple approaches to assay genetic variation, we found no evidence that the Haiti strain has acquired any genes by horizontal gene transfer, an observation that led us to discover that it is also poorly transformable. We have found no evidence that environmental strains have played a role in the evolution of the outbreak strain.Lee S. KatzAaron PetkauJohn BeaulaurierShaun TylerElena S. AntonovaMaryann A. TurnsekYan GuoSusana WangEllen E. PaxinosFabini OrataLori M. GladneySteven StroikaJason P. FolsterLori RoweMolly M. FreemanNatalie KnoxMike FraceJacques BoncyMorag GrahamBrian K. HammerYan BoucherAli BashirWilliam P. HanageGary Van DomselaarCheryl L. TarrAmerican Society for MicrobiologyarticleMicrobiologyQR1-502ENmBio, Vol 4, Iss 4 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbiology QR1-502
spellingShingle	Microbiology QR1-502 Lee S. Katz Aaron Petkau John Beaulaurier Shaun Tyler Elena S. Antonova Maryann A. Turnsek Yan Guo Susana Wang Ellen E. Paxinos Fabini Orata Lori M. Gladney Steven Stroika Jason P. Folster Lori Rowe Molly M. Freeman Natalie Knox Mike Frace Jacques Boncy Morag Graham Brian K. Hammer Yan Boucher Ali Bashir William P. Hanage Gary Van Domselaar Cheryl L. Tarr Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
description	ABSTRACT Prior to the epidemic that emerged in Haiti in October of 2010, cholera had not been documented in this country. After its introduction, a strain of Vibrio cholerae O1 spread rapidly throughout Haiti, where it caused over 600,000 cases of disease and >7,500 deaths in the first two years of the epidemic. We applied whole-genome sequencing to a temporal series of V. cholerae isolates from Haiti to gain insight into the mode and tempo of evolution in this isolated population of V. cholerae O1. Phylogenetic and Bayesian analyses supported the hypothesis that all isolates in the sample set diverged from a common ancestor within a time frame that is consistent with epidemiological observations. A pangenome analysis showed nearly homogeneous genomic content, with no evidence of gene acquisition among Haiti isolates. Nine nearly closed genomes assembled from continuous-long-read data showed evidence of genome rearrangements and supported the observation of no gene acquisition among isolates. Thus, intrinsic mutational processes can account for virtually all of the observed genetic polymorphism, with no demonstrable contribution from horizontal gene transfer (HGT). Consistent with this, the 12 Haiti isolates tested by laboratory HGT assays were severely impaired for transformation, although unlike previously characterized noncompetent V. cholerae isolates, each expressed hapR and possessed a functional quorum-sensing system. Continued monitoring of V. cholerae in Haiti will illuminate the processes influencing the origin and fate of genome variants, which will facilitate interpretation of genetic variation in future epidemics. IMPORTANCE Vibrio cholerae is the cause of substantial morbidity and mortality worldwide, with over three million cases of disease each year. An understanding of the mode and rate of evolutionary change is critical for proper interpretation of genome sequence data and attribution of outbreak sources. The Haiti epidemic provides an unprecedented opportunity to study an isolated, single-source outbreak of Vibrio cholerae O1 over an established time frame. By using multiple approaches to assay genetic variation, we found no evidence that the Haiti strain has acquired any genes by horizontal gene transfer, an observation that led us to discover that it is also poorly transformable. We have found no evidence that environmental strains have played a role in the evolution of the outbreak strain.
format	article
author	Lee S. Katz Aaron Petkau John Beaulaurier Shaun Tyler Elena S. Antonova Maryann A. Turnsek Yan Guo Susana Wang Ellen E. Paxinos Fabini Orata Lori M. Gladney Steven Stroika Jason P. Folster Lori Rowe Molly M. Freeman Natalie Knox Mike Frace Jacques Boncy Morag Graham Brian K. Hammer Yan Boucher Ali Bashir William P. Hanage Gary Van Domselaar Cheryl L. Tarr
author_facet	Lee S. Katz Aaron Petkau John Beaulaurier Shaun Tyler Elena S. Antonova Maryann A. Turnsek Yan Guo Susana Wang Ellen E. Paxinos Fabini Orata Lori M. Gladney Steven Stroika Jason P. Folster Lori Rowe Molly M. Freeman Natalie Knox Mike Frace Jacques Boncy Morag Graham Brian K. Hammer Yan Boucher Ali Bashir William P. Hanage Gary Van Domselaar Cheryl L. Tarr
author_sort	Lee S. Katz
title	Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
title_short	Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
title_full	Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
title_fullStr	Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
title_full_unstemmed	Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti
title_sort	evolutionary dynamics of <named-content content-type="genus-species">vibrio cholerae</named-content> o1 following a single-source introduction to haiti
publisher	American Society for Microbiology
publishDate	2013
url	https://doaj.org/article/eca35f0f8b1a42409063d3f3f98b9e45
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Evolutionary Dynamics of <named-content content-type="genus-species">Vibrio cholerae</named-content> O1 following a Single-Source Introduction to Haiti

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