title: Genetic diversity of intimin genes of attaching and effacing Escherichia coli strains.
abstract: In this study, we determined the sequences of four intimin variant genes detected in attaching and effacing Escherichia coli isolates of human origin. Three of them were novel and were designated eae-eta (eta), eae-iota (iota), and eae-kappa (kappa). The fourth was identical to the recently described eae-zeta (zeta), isolated from a bovine E. coli O84:NM isolate. We compared these sequences with those of published intimin-alpha, intimin-beta, intimin-gamma1, intimin-gamma2, intimin- epsilon, and intimin-theta alleles. Sequence analysis of these 10 intimin alleles confirmed extensive genetic diversity within the intimin gene family in E. coli. The genetic diversity was more prominent in the 3' region (starting at bp 2,112), which encodes the binding domain of intimin. Phylogenetic analyses revealed four groups of closely related intimin genes: alpha and zeta; beta and kappa; gamma1 and gamma2/theta; and epsilon and eta. Calculation of homoplasy ratios of sequences of the 5' region of eae (positions 1 to 2,111) revealed evidence for intragenic recombination. Split decomposition analysis also indicates that recombination events have played a role in the evolutionary history of eae. In conclusion, we recommend an eae nomenclature system based on the Greek alphabet and provide an updated PCR scheme for amplification and typing of E. coli eae.
authors.affiliation: Institut für Hygiene der Westfälischen Wilhelms-Universität, 48149 Münster, Germany.
authors.forename: W L
authors.initials: WL
authors.lastname: Zhang
authors.forename: B
authors.initials: B
authors.lastname: Köhler
authors.forename: E
authors.initials: E
authors.lastname: Oswald
authors.forename: L
authors.initials: L
authors.lastname: Beutin
authors.forename: H
authors.initials: H
authors.lastname: Karch
authors.forename: S
authors.initials: S
authors.lastname: Morabito
authors.forename: A
authors.initials: A
authors.lastname: Caprioli
authors.forename: S
authors.initials: S
authors.lastname: Suerbaum
authors.forename: H
authors.initials: H
authors.lastname: Schmidt
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D002648:Child; D003967:Diarrhea / Q000382:microbiology; D004926:Escherichia coli / Q000145:classification* / Q000235:genetics* / Q000472:pathogenicity; D004927:Escherichia coli Infections / Q000382:microbiology; D029968:Escherichia coli Proteins; D019143:Evolution, Molecular; D014644:Genetic Variation; D006801:Humans; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA
chemical_list: D018829:Adhesins, Bacterial; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; C073819:eaeA protein, E coli