Abstract:
:Shiga toxin-producing Escherichia coli (STEC) are foodborne pathogens causing severe gastroenteritis, which may lead to hemolytic uremic syndrome. The Locus of Enterocyte Effacement (LEE), a Pathogenicity Island (PAI), is a major determinant of intestinal epithelium attachment of a group of STEC strains; however, the virulence repertoire of STEC strains lacking LEE, has not been fully characterized. The incidence of LEE-negative STEC strains has increased in several countries, highlighting the relevance of their study. In order to gain insights into the basis for the emergence of LEE-negative STEC strains, we performed a large-scale genomic analysis of 367 strains isolated worldwide from humans, animals, food and the environment. We identified uncharacterized genomic islands, including two PAIs and one Integrative Conjugative Element. Additionally, the Locus of Adhesion and Autoaggregation (LAA) was the most prevalent PAI among LEE-negative strains and we found that it contributes to colonization of the mice intestine. Our comprehensive and rigorous comparative genomic and phylogenetic analyses suggest that the accumulative acquisition of PAIs has played an important, but currently unappreciated role, in the evolution of virulence in these strains. This study provides new knowledge on the pathogenicity of LEE-negative STEC strains and identifies molecular markers for their epidemiological surveillance.
journal_name
Emerg Microbes Infectjournal_title
Emerging microbes & infectionsauthors
Montero DA,Canto FD,Velasco J,Colello R,Padola NL,Salazar JC,Martin CS,Oñate A,Blanco J,Rasko DA,Contreras C,Puente JL,Scheutz F,Franz E,Vidal RMdoi
10.1080/22221751.2019.1595985subject
Has Abstractpub_date
2019-01-01 00:00:00pages
486-502issue
1issn
2222-1751journal_volume
8pub_type
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