DNA probe technology for detection of Haemophilus influenzae

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F Malouin1, L E Bryan

  • 1Department of Microbiology and Infectious Diseases, University of Calgary Health Science Centres, Alberta, Canada.

Molecular and Cellular Probes
|September 1, 1987
PubMed

Insights

A novel DNA probe accurately detects Haemophilus influenzae and Haemophilus aegyptius. This highly specific and sensitive probe is valuable for identifying these bacterial strains.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Diagnostics

Background:

  • Accurate identification of Haemophilus influenzae is crucial for effective treatment and public health.
  • Existing diagnostic methods may lack the required specificity or sensitivity.
  • Development of molecular probes offers a promising avenue for bacterial detection.

Purpose of the Study:

  • To develop and evaluate a specific DNA probe for the detection of Haemophilus influenzae.
  • To assess the probe's sensitivity and specificity against various bacterial strains.
  • To determine the utility of the probe in clinical or research settings.

Main Methods:

  • A 5 kb DNA fragment from Haemophilus influenzae, related to penicillin-binding proteins expression, was used to create a 32P-labeled probe.
  • Probe specificity was tested using hybridization assays on bacterial dots and Southern blots.
  • A total of 75 bacterial strains, including various Haemophilus species and other related/unrelated bacteria, were analyzed.

Main Results:

  • The DNA probe showed very strong hybridization with all tested Haemophilus influenzae (18 strains) and Haemophilus aegyptius (1 strain) isolates.
  • Hybridization varied among other Haemophilus species and Pasteurellaceae, with low hybridization in less related species.
  • The probe demonstrated high sensitivity, detecting as few as 10(5)-10(6) H. influenzae cells or 0.1 microgram of DNA.
  • Southern blot analysis confirmed strong hybridization exclusively with H. influenzae and H. aegyptius among the tested species.

Conclusions:

  • The developed DNA probe exhibits high specificity and sensitivity for detecting Haemophilus influenzae.
  • The probe is also effective for the detection of Haemophilus aegyptius.
  • Under stringent hybridization conditions, this probe is a valuable tool for the specific identification of H. influenzae and potentially H. aegyptius.

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