Extensive genomic diversity and selective conservation of virulence-determinants in enterohemorrhagic Escherichia coli strains of O157 and non-O157 serotypes

Enterohemorrhagic Escherichia coli (EHEC) O157 causes severe food-borne illness in humans. The chromosome of O157 consists of 4.1 Mb backbone sequences shared by benign E. coli K-12, and 1.4 Mb O157-specific sequences encoding many virulence determinants, such as Shiga toxin genes (stx genes) and th...

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Veröffentlicht in:Genome Biology 2007-01, Vol.8 (7), p.R138-R138
Hauptverfasser: Ogura, Yoshitoshi, Ooka, Tadasuke, Asadulghani, Terajima, Jun, Nougayrède, Jean-Philippe, Kurokawa, Ken, Tashiro, Kousuke, Tobe, Toru, Nakayama, Keisuke, Kuhara, Satoru, Oswald, Eric, Watanabe, Haruo, Hayashi, Tetsuya
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container_end_page R138
container_issue 7
container_start_page R138
container_title Genome Biology
container_volume 8
creator Ogura, Yoshitoshi
Ooka, Tadasuke
Asadulghani
Terajima, Jun
Nougayrède, Jean-Philippe
Kurokawa, Ken
Tashiro, Kousuke
Tobe, Toru
Nakayama, Keisuke
Kuhara, Satoru
Oswald, Eric
Watanabe, Haruo
Hayashi, Tetsuya
description Enterohemorrhagic Escherichia coli (EHEC) O157 causes severe food-borne illness in humans. The chromosome of O157 consists of 4.1 Mb backbone sequences shared by benign E. coli K-12, and 1.4 Mb O157-specific sequences encoding many virulence determinants, such as Shiga toxin genes (stx genes) and the locus of enterocyte effacement (LEE). Non-O157 EHECs belonging to distinct clonal lineages from O157 also cause similar illness in humans. According to the 'parallel' evolution model, they have independently acquired the major virulence determinants, the stx genes and LEE. However, the genomic differences between O157 and non-O157 EHECs have not yet been systematically analyzed. Using microarray and whole genome PCR scanning analyses, we performed a whole genome comparison of 20 EHEC strains of O26, O111, and O103 serotypes with O157. In non-O157 EHEC strains, although genome sizes were similar with or rather larger than O157 and the backbone regions were well conserved, O157-specific regions were very poorly conserved. Around only 20% of the O157-specific genes were fully conserved in each non-O157 serotype. However, the non-O157 EHECs contained a significant number of virulence genes that are found on prophages and plasmids in O157, and also multiple prophages similar to, but significantly divergent from, those in O157. Although O157 and non-O157 EHECs have independently acquired a huge amount of serotype- or strain-specific genes by lateral gene transfer, they share an unexpectedly large number of virulence genes. Independent infections of similar but distinct bacteriophages carrying these virulence determinants are deeply involved in the evolution of O157 and non-O157 EHECs.
doi_str_mv 10.1186/gb-2007-8-7-r138
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The chromosome of O157 consists of 4.1 Mb backbone sequences shared by benign E. coli K-12, and 1.4 Mb O157-specific sequences encoding many virulence determinants, such as Shiga toxin genes (stx genes) and the locus of enterocyte effacement (LEE). Non-O157 EHECs belonging to distinct clonal lineages from O157 also cause similar illness in humans. According to the 'parallel' evolution model, they have independently acquired the major virulence determinants, the stx genes and LEE. However, the genomic differences between O157 and non-O157 EHECs have not yet been systematically analyzed. Using microarray and whole genome PCR scanning analyses, we performed a whole genome comparison of 20 EHEC strains of O26, O111, and O103 serotypes with O157. In non-O157 EHEC strains, although genome sizes were similar with or rather larger than O157 and the backbone regions were well conserved, O157-specific regions were very poorly conserved. Around only 20% of the O157-specific genes were fully conserved in each non-O157 serotype. However, the non-O157 EHECs contained a significant number of virulence genes that are found on prophages and plasmids in O157, and also multiple prophages similar to, but significantly divergent from, those in O157. Although O157 and non-O157 EHECs have independently acquired a huge amount of serotype- or strain-specific genes by lateral gene transfer, they share an unexpectedly large number of virulence genes. 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Around only 20% of the O157-specific genes were fully conserved in each non-O157 serotype. However, the non-O157 EHECs contained a significant number of virulence genes that are found on prophages and plasmids in O157, and also multiple prophages similar to, but significantly divergent from, those in O157. Although O157 and non-O157 EHECs have independently acquired a huge amount of serotype- or strain-specific genes by lateral gene transfer, they share an unexpectedly large number of virulence genes. Independent infections of similar but distinct bacteriophages carrying these virulence determinants are deeply involved in the evolution of O157 and non-O157 EHECs.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>17711596</pmid><doi>10.1186/gb-2007-8-7-r138</doi><tpages>R138</tpages><orcidid>https://orcid.org/0000-0002-6802-1890</orcidid><oa>free_for_read</oa></addata></record>
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subjects Base Sequence
Biological diversity
Escherichia coli
Escherichia coli O157 - genetics
Escherichia coli O157 - pathogenicity
Evolution, Molecular
Genetic aspects
Genetic Variation
Genome, Bacterial - genetics
Genomics
Health aspects
Life Sciences
Molecular Sequence Data
Oligonucleotide Array Sequence Analysis
Plasmids - genetics
Prophages - genetics
Virulence (Microbiology)
Virulence Factors - genetics
title Extensive genomic diversity and selective conservation of virulence-determinants in enterohemorrhagic Escherichia coli strains of O157 and non-O157 serotypes
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