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FEMS Microbiol Lett. 2002 Jul 2;212(2):221-8.

Identification of a type III secretion system in uropathogenic Escherichia coli.

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Department of Infection Biology, Institute of Basic Medical Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki 305-8575, Japan.


To determine virulence-related genes in uropathogenic Escherichia coli (UPEC) showing invasiveness to T-24 bladder cancer cells, genomic subtractive hybridization was performed between a highly invasive and a less invasive strain. Forty-nine DNA fragments were isolated from the invasive strain. One of them showed homology with Salmonella invA gene. By chromosomal walking of the strain, a type III secretion system that has been described in E. coli O157:H7 was identified on the genome of the invasive strains. Three strains out of 100 UPEC isolates had a type III secretion system inserted at 64 min of the chromosome, corresponding to E. coli K-12 MG1655. This finding suggested that the type III secretion system could play a part in uropathogenicity of UPEC.

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