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Identification of pathogenic Helicobacter species by chaperonin-60 differentiation on plastic DNA arrays
Luke Masson1, Christine Maynard, Roland Brousseau
1Biotechnology Research Institute, National Research Council of Canada, Montréal, QC, Canada. luke.masson@nrc-cnrc.gc.ca
Abstract:
A microarray method for bacterial species identification based on cpn60 and 16S rDNA hybridization was developed. Specific cpn60 or 16S rDNA oligonucleotides from various Helicobacter or Campylobacter species were printed and immobilized onto a proprietary plastic solid support. Using universal primers, fragments derived from either cpn60 or 16S rDNA genes from single isolates or from a complex human waste sludge DNA sample spiked with Helicobacter pylori were biotinylated and hybridized to the plastic slide. Subsequent querying with a streptavidin-horseradish peroxidase conjugate followed by color development using tetramethylbenzidine resulted in accurate Helicobacter species identification with no cross-hybridization to either the 16S rDNA or the cpn60 sequence of a closely related strain of Campylobacter jejuni. The combination of a nonfluorescence visual detection system with a polymer-based DNA microarray slide has resulted in a molecular tool that should prove useful in numerous applications requiring rapid, low-cost bacterial species identification.
Insights
A new DNA microarray method accurately identifies bacterial species using cpn60 and 16S rDNA gene sequences. This rapid, low-cost tool offers a visual detection system for bacterial identification.
Area of Science:
- Microbiology
- Molecular Biology
- Biotechnology
Background:
- Accurate bacterial species identification is crucial for clinical diagnostics and environmental monitoring.
- Existing methods can be time-consuming or require specialized equipment.
- The need for rapid, cost-effective identification tools is significant.
Purpose of the Study:
- To develop a novel microarray method for bacterial species identification.
- To utilize cpn60 and 16S ribosomal DNA (rDNA) gene sequences for specific hybridization.
- To create a visual detection system for rapid and low-cost bacterial identification.
Main Methods:
- Oligonucleotides specific to cpn60 or 16S rDNA from Helicobacter and Campylobacter species were immobilized on a plastic microarray slide.
- Biotinylated DNA fragments from single isolates or complex samples were hybridized to the microarray.
- Streptavidin-horseradish peroxidase conjugate and tetramethylbenzidine were used for colorimetric detection.
Main Results:
- The developed microarray method accurately identified Helicobacter species.
- No cross-hybridization was observed with a closely related Campylobacter jejuni strain.
- The method demonstrated successful identification from both single isolates and spiked complex DNA samples.
Conclusions:
- A robust and visually detectable DNA microarray assay for bacterial species identification was successfully developed.
- This method offers a rapid, low-cost, and accurate alternative for bacterial identification.
- The technology has potential applications in various fields requiring efficient microbial analysis.
