Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions

ABSTRACT Enteropathogenic Escherichia coli (EPEC) bacteria are a diverse group of pathogens that cause moderate to severe diarrhea in young children in developing countries. EPEC isolates can be further subclassified as typical EPEC (tEPEC) isolates that contain the bundle-forming pilus (BFP) or as...

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Autores principales:	Tracy H. Hazen, Sean C. Daugherty, Amol C. Shetty, James P. Nataro, David A. Rasko
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2017
Materias:	EPEC Escherichia coli diversity transcriptome Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/beed4bb56606410d9e2933ee1b6e613a
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spelling	oai:doaj.org-article:beed4bb56606410d9e2933ee1b6e613a2021-12-02T18:39:32ZTranscriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions10.1128/mSystems.00024-172379-5077https://doaj.org/article/beed4bb56606410d9e2933ee1b6e613a2017-08-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSystems.00024-17https://doaj.org/toc/2379-5077ABSTRACT Enteropathogenic Escherichia coli (EPEC) bacteria are a diverse group of pathogens that cause moderate to severe diarrhea in young children in developing countries. EPEC isolates can be further subclassified as typical EPEC (tEPEC) isolates that contain the bundle-forming pilus (BFP) or as atypical EPEC (aEPEC) isolates that do not contain BFP. Comparative genomics studies have recently highlighted the considerable genomic diversity among EPEC isolates. In the current study, we used RNA sequencing (RNA-Seq) to characterize the global transcriptomes of eight tEPEC isolates representing the identified genomic diversity, as well as one aEPEC isolate. The global transcriptomes were determined for the EPEC isolates under conditions of laboratory growth that are known to induce expression of virulence-associated genes. The findings demonstrate that unique genes of EPEC isolates from diverse phylogenomic lineages contribute to variation in their global transcriptomes. There were also phylogroup-specific differences in the global transcriptomes, including genes involved in iron acquisition, which had significant differential expression in the EPEC isolates belonging to phylogroup B2. Also, three EPEC isolates from the same phylogenomic lineage (EPEC8) had greater levels of similarity in their genomic content and exhibited greater similarities in their global transcriptomes than EPEC from other lineages; however, even among closely related isolates there were isolate-specific differences among their transcriptomes. These findings highlight the transcriptional variability that correlates with the previously unappreciated genomic diversity of EPEC. IMPORTANCE Recent studies have demonstrated that there is considerable genomic diversity among EPEC isolates; however, it is unknown if this genomic diversity leads to differences in their global transcription. This study used RNA-Seq to compare the global transcriptomes of EPEC isolates from diverse phylogenomic lineages. We demonstrate that there are lineage- and isolate-specific differences in the transcriptomes of genomically diverse EPEC isolates during growth under in vitro virulence-inducing conditions. This study addressed biological variation among isolates of a single pathovar in an effort to demonstrate that while each of these isolates is considered an EPEC isolate, there is significant transcriptional diversity among members of this pathovar. Future studies should consider whether this previously undescribed transcriptional variation may play a significant role in isolate-specific variability of EPEC clinical presentations.Tracy H. HazenSean C. DaughertyAmol C. ShettyJames P. NataroDavid A. RaskoAmerican Society for MicrobiologyarticleEPECEscherichia colidiversitytranscriptomeMicrobiologyQR1-502ENmSystems, Vol 2, Iss 4 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	EPEC Escherichia coli diversity transcriptome Microbiology QR1-502
spellingShingle	EPEC Escherichia coli diversity transcriptome Microbiology QR1-502 Tracy H. Hazen Sean C. Daugherty Amol C. Shetty James P. Nataro David A. Rasko Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
description	ABSTRACT Enteropathogenic Escherichia coli (EPEC) bacteria are a diverse group of pathogens that cause moderate to severe diarrhea in young children in developing countries. EPEC isolates can be further subclassified as typical EPEC (tEPEC) isolates that contain the bundle-forming pilus (BFP) or as atypical EPEC (aEPEC) isolates that do not contain BFP. Comparative genomics studies have recently highlighted the considerable genomic diversity among EPEC isolates. In the current study, we used RNA sequencing (RNA-Seq) to characterize the global transcriptomes of eight tEPEC isolates representing the identified genomic diversity, as well as one aEPEC isolate. The global transcriptomes were determined for the EPEC isolates under conditions of laboratory growth that are known to induce expression of virulence-associated genes. The findings demonstrate that unique genes of EPEC isolates from diverse phylogenomic lineages contribute to variation in their global transcriptomes. There were also phylogroup-specific differences in the global transcriptomes, including genes involved in iron acquisition, which had significant differential expression in the EPEC isolates belonging to phylogroup B2. Also, three EPEC isolates from the same phylogenomic lineage (EPEC8) had greater levels of similarity in their genomic content and exhibited greater similarities in their global transcriptomes than EPEC from other lineages; however, even among closely related isolates there were isolate-specific differences among their transcriptomes. These findings highlight the transcriptional variability that correlates with the previously unappreciated genomic diversity of EPEC. IMPORTANCE Recent studies have demonstrated that there is considerable genomic diversity among EPEC isolates; however, it is unknown if this genomic diversity leads to differences in their global transcription. This study used RNA-Seq to compare the global transcriptomes of EPEC isolates from diverse phylogenomic lineages. We demonstrate that there are lineage- and isolate-specific differences in the transcriptomes of genomically diverse EPEC isolates during growth under in vitro virulence-inducing conditions. This study addressed biological variation among isolates of a single pathovar in an effort to demonstrate that while each of these isolates is considered an EPEC isolate, there is significant transcriptional diversity among members of this pathovar. Future studies should consider whether this previously undescribed transcriptional variation may play a significant role in isolate-specific variability of EPEC clinical presentations.
format	article
author	Tracy H. Hazen Sean C. Daugherty Amol C. Shetty James P. Nataro David A. Rasko
author_facet	Tracy H. Hazen Sean C. Daugherty Amol C. Shetty James P. Nataro David A. Rasko
author_sort	Tracy H. Hazen
title	Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
title_short	Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
title_full	Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
title_fullStr	Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
title_full_unstemmed	Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions
title_sort	transcriptional variation of diverse enteropathogenic <italic toggle="yes">escherichia coli</italic> isolates under virulence-inducing conditions
publisher	American Society for Microbiology
publishDate	2017
url	https://doaj.org/article/beed4bb56606410d9e2933ee1b6e613a
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Transcriptional Variation of Diverse Enteropathogenic <italic toggle="yes">Escherichia coli</italic> Isolates under Virulence-Inducing Conditions

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