Phylogenetic comparisons reveal multiple acquisitions of the toxin genes by enterotoxigenic Escherichia coli strains of different evolutionary lineages.
Escherichia coli is a diverse bacterial species which is widely distributed in the environment but also exists as a commensal and pathogen of different host species. Human intestinal pathogenic E. coli causes over 160 million cases of diarrhea and an estimated 1 million deaths per year. The majority of deaths are attributable to one pathovar of E. coli, namely, enterotoxigenic E. coli. The pathogenesis of enterotoxigenic E. coli is dependent on the production of a colonization factor to promote adhesion to the intestinal epithelium and the elaboration of heat-labile or heat-stable toxins which induce a secretory diarrhea. Despite the high morbidity and mortality associated with enterotoxigenic E. coli infection, little is known of the genetic background of this global pathogen. Here we demonstrate by multilocus sequence typing that enterotoxigenic E. coli isolates are present in all phylogenetic lineages of E. coli, indicating that acquisition of the toxin genes may be sufficient to generate an enterotoxigenic E. coli strain. In addition, screening of diarrheal isolates for the presence of additional genes previously associated with the virulence of enterotoxigenic E. coli revealed that they were not abundant. These observations have significant implications for disease epidemiology and for the design of effective vaccines.
Turner
Sue M
SM
Division of Immunity and Infection, The Medical School, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom, and St. Luke's Episcopal Hospital, Houston, TX 77083, USA.
Chaudhuri
Roy R
RR
Jiang
Zhi-Dong
ZD
DuPont
Herbert
H
Gyles
Carlton
C
Penn
Charles W
CW
Pallen
Mark J
MJ
Henderson
Ian R
IR
D001427:Bacterial Toxins / Q000235:genetics*; D015373:Bacterial Typing Techniques; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D003967:Diarrhea / Q000382:microbiology; D004768:Enterotoxins / Q000235:genetics; D004926:Escherichia coli / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000382:microbiology; D029968:Escherichia coli Proteins / Q000235:genetics; D019143:Evolution, Molecular; D005838:Genotype; D006801:Humans; D010802:Phylogeny; D011995:Recombination, Genetic; D017422:Sequence Analysis, DNA; D014774:Virulence / Q000235:genetics; D037521:Virulence Factors / Q000235:genetics*
D001427:Bacterial Toxins; D004269:DNA, Bacterial; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D037521:Virulence Factors; C034151:heat stable toxin (E coli); C027538:heat-labile enterotoxin, E coli