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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Appl+Environ+Microbiol
2015 ; 81
(20
): 7041-7
Nephropedia Template TP
gab.com Text
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English Wikipedia
Highly Virulent Non-O157 Enterohemorrhagic Escherichia coli (EHEC) Serotypes
Reflect Similar Phylogenetic Lineages, Providing New Insights into the Evolution
of EHEC
#MMPMID26231647
Eichhorn I
; Heidemanns K
; Semmler T
; Kinnemann B
; Mellmann A
; Harmsen D
; Anjum MF
; Schmidt H
; Fruth A
; Valentin-Weigand P
; Heesemann J
; Suerbaum S
; Karch H
; Wieler LH
Appl Environ Microbiol
2015[Oct]; 81
(20
): 7041-7
PMID26231647
show ga
Enterohemorrhagic Escherichia coli (EHEC) is the causative agent of bloody
diarrhea and extraintestinal sequelae in humans, most importantly
hemolytic-uremic syndrome (HUS) and thrombotic thrombocytopenic purpura (TTP).
Besides the bacteriophage-encoded Shiga toxin gene (stx), EHEC harbors the locus
of enterocyte effacement (LEE), which confers the ability to cause attaching and
effacing lesions. Currently, the vast majority of EHEC infections are caused by
strains belonging to five O serogroups (the "big five"), which, in addition to
O157, the most important, comprise O26, O103, O111, and O145. We hypothesize that
these four non-O157 EHEC serotypes differ in their phylogenies. To test this
hypothesis, we used multilocus sequence typing (MLST) to analyze a large
collection of 250 isolates of these four O serogroups, which were isolated from
diseased as well as healthy humans and cattle between 1952 and 2009. The majority
of the EHEC isolates of O serogroups O26 and O111 clustered into one sequence
type complex, STC29. Isolates of O103 clustered mainly in STC20, and most
isolates of O145 were found within STC32. In addition to these EHEC strains,
STC29 also included stx-negative E. coli strains, termed atypical
enteropathogenic E. coli (aEPEC), yet another intestinal pathogenic E. coli
group. The finding that aEPEC and EHEC isolates of non-O157 O serogroups share
the same phylogeny suggests an ongoing microevolutionary scenario in which the
phage-encoded Shiga toxin gene stx is transferred between aEPEC and EHEC. As a
consequence, aEPEC strains of STC29 can be regarded as post- or pre-EHEC
isolates. Therefore, STC29 incorporates phylogenetic information useful for
unraveling the evolution of EHEC.