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Related Experiment Videos

Insertion element IS3-based PCR method for subtyping Escherichia coli O157:H7

C J Thompson1, C Daly, T J Barrett

  • 1State Hygienic Laboratory, University of Iowa, Iowa City 52242, USA.

Journal of Clinical Microbiology
|May 9, 1998
PubMed
Summary

A new PCR method using the IS3 repetitive element effectively subtypes Escherichia coli O157:H7. This simple, rapid screening tool can identify unrelated bacterial isolates and group outbreak-related strains.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Escherichia coli O157:H7 is a significant foodborne pathogen.
  • Accurate subtyping is crucial for tracking outbreaks and understanding transmission.
  • Pulsed-field gel electrophoresis (PFGE) is a common but complex subtyping method.

Purpose of the Study:

  • To develop a simple and rapid subtyping method for Escherichia coli O157:H7.
  • To evaluate the efficacy of a novel PCR-based approach targeting the IS3 repetitive element.
  • To compare the performance of the new method with PFGE.

Main Methods:

  • Developed a PCR subtyping method using variable DNA sequences flanking the IS3 element.
  • Prepared template DNA by boiling bacterial cells in Chelex.

Related Experiment Videos

  • Performed two separate IS3 PCR amplifications: single primer (IS3A) and dual primers (IS3A and IS3B).
  • Applied the method to 35 E. coli O157:H7 isolates previously characterized by PFGE.

    • Main Results:

    • PFGE identified 25 distinct subtypes among the isolates.
    • Single IS3A PCR identified 6 subtypes; IS3A-IS3B PCR identified 14 subtypes.
    • Combined IS3 PCR amplifications yielded 15 distinct subtypes.
    • The IS3 PCR method successfully grouped all outbreak-related isolates.
    • PCR banding patterns demonstrated reproducibility.

    Conclusions:

    • IS3 PCR subtyping is a simple, rapid, and reproducible method for E. coli O157:H7.
    • While less sensitive than PFGE, it effectively screens for unrelated isolates and identifies outbreak clusters.
    • This PCR-based approach offers a valuable alternative for routine subtyping in diagnostic laboratories.