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ORIGINAL ARTICLE
Korean J Pediatr 2015 January;58(1) :20-27.
Published online 2014 September 05.       
Molecular typing of uropathogenic Escherichia coli isolated from Korean children with urinary tract infection
Ki Wook Yun, Do Soo Kim1, Wonyong Kim2, In Seok Lim1
1Department of Pediatrics, Chung-Ang University College of Medicine, Seoul, Korea
2Department of Microbiology, Chung-Ang University College of Medicine, Seoul, Korea
Corresponding Author: In Seok Lim ,Tel: 02-6299-3183, Fax: 02-6264-2167, Email: inseok@cau.ac.kr
Copyright © 2015 by The Korean Pediatric Society
ABSTRACT
Purpose: We investigated the molecular types of uropathogenic Escherichia coli (UPEC) by using conventional phylogrouping, multilocus sequence typing (MLST), and fimH genotyping.
Methods: Samples of patients younger than 18 years of age were collected from the Chung-Ang University Hospital over 2 years. Conventional phylogenetic grouping for UPEC strains was performed by polymerase chain reaction (PCR). Bacterial strain sequence types (STs) were classified on the basis of the results of partial sequencing of seven housekeeping genes. In addition, we analyzed nucleotide variations in a 424-base pair fragment of fimH , a major virulence factor in UPEC.
Results: Sixty-four UPEC isolates were analyzed in this study. Phylogenetic grouping revealed that group B2 was the most common type (n=54, 84%). We identified 16 distinctive STs using MLST. The most common STs were ST95 (35.9%), ST73 (15.6%), ST131 (12.5%), ST69 (7.8%), and ST14 (6.3%). Fourteen fimH allele types were identified, of which 11 had been previously reported, and the remaining three were identified in this study. f1 (n=28, 45.2%) was found to be the most common allele type, followed by f6 and f9 (n=7, 11.3% each). Comparative analysis of the results from the three different molecular typing techniques revealed that both MLST and fimH typing generated more discriminatory UPEC types than did PCR-based phylogrouping.
Conclusion: We characterized UPEC molecular types isolated from Korean children by MLST and fimH genotyping. fimH genotyping might serve as a useful molecular test for large epidemiologic studies of UPEC isolates.
Keywords: Uropathogenic Escherichia coli | Phylogeny | Multilocus sequence typing | fimH protein
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