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Related Experiment Videos

Probe hybridization array typing: a binary typing method for Escherichia coli.

U Srinivasan1, L Zhang, A M France

  • 1Department of Epidemiology, University of Michigan, School of Public Health, Ann Arbor, MI 48109, USA.

Journal of Clinical Microbiology
|November 3, 2006
PubMed
Summary
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Probe hybridization array typing (PHAT) offers a high-throughput method for distinguishing Escherichia coli strains. This binary typing approach provides a reproducible genetic fingerprint crucial for outbreak investigations.

Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Accurate differentiation of Escherichia coli strains is essential for effective outbreak investigations.
  • Traditional typing methods like gel- and PCR-based techniques can be complex, lack uniformity, and are not high-throughput.
  • Binary typing offers a simpler, more standardized approach to bacterial strain identification.

Purpose of the Study:

  • To develop, validate, and assess the discriminatory power of a novel E. coli binary typing method called probe hybridization array typing (PHAT).
  • To evaluate PHAT's effectiveness in distinguishing between various E. coli strains, including those relevant to human infections.

Main Methods:

  • PHAT utilizes DNA hybridization to generate a unique genetic fingerprint for each bacterial genome.

Related Experiment Videos

  • Probes for PHAT were derived from genome subtractive hybridization experiments.
  • The method was validated using the ECOR collection and 33 rectal E. coli strains from women with urinary tract infections.

    • Main Results:

    • PHAT demonstrated 98% discriminatory power for human rectal E. coli strains, matching multilocus sequence typing (MLST) and pulsed-field gel electrophoresis.
    • For the broader ECOR collection, PHAT's discrimination (80%) was lower than MLST, ribotyping, and enterobacterial repetitive intergenic consensus sequence PCR.
    • When focused on human-pathogenic B2 and D lineage ECOR strains, PHAT achieved 94% discrimination.

    Conclusions:

    • PHAT is a versatile, high-throughput binary typing method for E. coli that can be adapted for other bacterial species.
    • Its discriminatory power can be tailored by adjusting the probe set.
    • PHAT shows promise as a standardized tool for bacterial strain typing and outbreak surveillance.