Prevalence of Iron Transport Gene on Pathogenicity-Associated Island of Uropathogenic Escherichia coli in E. coli O157:H7 Containing Shiga Toxin Gene

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Abstract
Uropathogenc Escherichia coli (UPEC) CFT073 has a pathogenicity-associated island (PAI CFT073 ), which causes pyelonephritis and cystitis. Using PCR method, we found the prrA gene of PAI CFT073 in E. coli O157:H7 EDL933. Further detailed PCR screening of 38 open reading frames, the right and left junction sequences of PAI CFT073 , revealed that it is the prrA-modD-yc73-fepC gene cluster but not the PAI CFT073 present in E. coli O157:H7 EDL933. A rapid preliminary analysis suggested that the prrA-modD-yc73-fepC gene cluster of the PAI CFT073 , is present in 43 strains of E. coli O157:H7 containing Shiga toxin (Stx) gene but absent in 19 strains of E. coli O157:H7 without Stx gene. A strict co-occurrence of the prrA-modD-yc73-fepC gene cluster and Stx genes was observed, regardless of their origin. The prrA-modD-yc73-fepC gene cluster encode proteins probably involved in iron uptake system, which strongly suggests the importance of iron metabolism in the Stx-mediated virulence. In addition, the prrA-modD-yc73-fepC gene cluster may be used as a diagnostic marker to distinguish E. coli O157:H7 strains containing Stx gene from that without Stx gene, and possibly to quickly detect other pathogenic gram-negative bacteria containing the Stx gene.

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