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Molecular epidemiology of cytolethal distending toxin-producing Escherichia coli

Research Project

Project/Area Number 15406019
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Bacteriology (including Mycology)
Research InstitutionOsaka Prefecture University

Principal Investigator

YAMASAKI Shinji  Osaka Prefecture University, Graduate School of Life and Environmental Sciences, Department of Veterinary Science, Professor, 農学生命科学研究科, 教授 (70221653)

Co-Investigator(Kenkyū-buntansha) TSUKAMOTO Teizou  Osaka Prefectural Institute of Public Health, Bacteriology Division, Division Chief, 食品衛生部, 統括研究員 (80250314)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥11,300,000 (Direct Cost: ¥11,300,000)
Fiscal Year 2004: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 2003: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsCDT / EPEC / E.coli / ETEC / Diarrhea
Research Abstract

We have shown that cdtB gene was specifically identified among enteropathogenic E.coli(EPEC). Some of the strains are associated in causing bloody diarrhea among children and exhibited higher production of CDT. The cdtB positive strain mostly belongs to O86a and O127a serogroups. Pulsed-field gel electrophoresis profiles showed that the EPEC strains harboring ctdB were genetically diverse.
In this study, 1607 stool specimens were screened for the cdtB harboring enteric pathogens. In the probe hybridization assay, 6 samples (0.4%) were positive and the PCR assay confirmed 5 strains. Form the cdtB probe or PCR positive samples only E.coli strains were isolated and confirmed by serology. Four out of six strains were identified as serogroup O142. Characterization of these strains for different virulence genes specific for diarrheagenic E.coli showed that six strains were enteropathogenic E.coli(EPEC), as they harbored eae as well as bfp genes. We have reported the same trend in our early reports.
Expect for two, all the strains harbored cdtA and cdtC genes. These two strains were negative for cdtB by PCR and did not express the CDT in the tissue culture assay. Based on the variation in the sequence of amino acids, the Cdt is classified into CdtI, CdtII and CdtIII. Currently, we are analyzing all our strains to detect the Cdt alleles.
Clinical and bacteriological studies have revealed that production of colicin by E.coli having a part of intestinal microbiocenasis is related to the clinical manifestation of inflammatory disease of the gastrointestinal tract. Colicin expression was determined in many enteric pathogens especially among enteropathogenic E.coli(EPEC) and enterohemorrhagic E.coli(EHEC). Colicin expression was confirmed with 3 out of 18 strains (16.7%). There is no correlation between serogroups and colicin expression.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2005 2004 2003 Other

All Journal Article (12 results)

  • [Journal Article] 4.腸管出血性大腸菌2005

    • Author(s)
      山崎伸二
    • Journal Title

      化学療法の領域 21(4)

      Pages: 498-506

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Enterohemorrhagic Escherichia coli2005

    • Author(s)
      Yamasaki S.
    • Journal Title

      Antibiotics & Chemotherapy(in Japanese) 21(4)

      Pages: 498-506

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characterization of Shiga toxin-producing Escherichia coli (STEC) isolated from seafood and beef2004

    • Author(s)
      Kumar H.S.et al.
    • Journal Title

      FEMS Microbiology Letters 233(1)

      Pages: 173-178

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Virulence characterization and molecular epidemiology of enteroaggregative Escherichia coli isolates from hospitalized diarrheal patients in Kolkata, India2004

    • Author(s)
      Kahali S. et al.
    • Journal Title

      Journal Clinical Microbiology 42(9)

      Pages: 4111-4120

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characterization of Shiga toxin-producing Escherichia coli(STEC) isolated from seafood and beef2004

    • Author(s)
      Kumar H.S.et al.
    • Journal Title

      FEMS Microbiology Letters 233(1)

      Pages: 173-178

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Virulence characterization and molecular epidemiology of Enteroaggregative Escherichia coli isolates from hospitalized diarrheal patients in Kolkata, India2004

    • Author(s)
      Kahali S. et al.
    • Journal Title

      Journal Clinical Microbiology 42(9)

      Pages: 4111-4120

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Association of cytolethal distending toxin locus cdtB with enteropathogenic Escherichia coli isolated from patients with acute diarrhea in Calcutta India2003

    • Author(s)
      Pandey M. et al.
    • Journal Title

      Journal of Clinical Microbiology 41(11)

      Pages: 5277-5281

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Association of cytolethal distending toxin locus cdtB with Enteropathogenic Escherichia coli isolated from patients with acute diarrhea in Calcutta India2003

    • Author(s)
      Pandey et al.
    • Journal Title

      Journal of Clinical Microbiology 41(11)

      Pages: 5277-5281

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Association of cytolethal distending toxin locus cdtB with entrooathogenic Escherichia coli isolated from acute diarrheal natients in Calcutta India2003

    • Author(s)
      Panty M. et al.
    • Journal Title

      Journal of clinical Microbiology 41(11)

      Pages: 5277-5281

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Association of cytolethal distending toxin locus cdtB with entrooathogenic Escherichia coli isolated fromn acute diarrheal natients in Calcutta India2003

    • Author(s)
      Pandey M. et al.
    • Journal Title

      Journal of Clinical Microbiology 41(11)

      Pages: 5277-5281

    • Related Report
      2003 Annual Research Report
  • [Journal Article] Cytolethal distending Toxin (CDT) : how this toxin contributes to gastrointestinal infection?

    • Author(s)
      Yamasaki S. et al.
    • Journal Title

      Journal of Toxicology and Toxin Review (In press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Cytolethal distending Toxin(CDT) : How this toxin contributes to gastrointestinal infection?

    • Author(s)
      Yamasaki S. et al.
    • Journal Title

      Journal of Toxicology and Toxin Review (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary

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Published: 2003-04-01   Modified: 2016-04-21  

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