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Updated: Aug 16, 2026
Identification of Mycobacterium Species by DNA Microarray Chip Method
Published on: June 24, 2025
Simultaneous detection of four human pathogenic microsporidian species from clinical samples by oligonucleotide
Zheng Wang1, Palmer A Orlandi, David A Stenger
1Center for Bio/Molecular Science and Engineering, Code 6910, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA. zwang@cbmse.nrl.navy.mil
Abstract:
Microsporidian species have been rapidly emerging as human enteric pathogens in immunocompromised and immunocompetent individuals in recent years. Routine diagnostic techniques for microsporidia in clinical laboratories are laborious and insensitive and tend to underestimate their presence. In most instances, they are unable to differentiate species of spores due to their small sizes and similar morphologies. In this study, we report the development of another protozoan oligonucleotide microarray assay for the simultaneous detection and identification to the species level of four major microsporidian species: Enterocytozoon bieneusi, Encephalitozoon cuniculi, Encephalitozoon hellem, and Encephalitozoon intestinalis. The 18S small-subunit rRNA gene was chosen as the amplification target, labeled with fluorescence dye, and hybridized to a series of species-specific oligonucleotide probes immobilized on a microchip. The specificity and sensitivity of the microarray were clearly demonstrated by the unique hybridization profiles exhibited by each species of microsporidian tested and its ability to detect as few as 10 spores. In order to assess the applicability of this microarray in a clinical setting, we conducted microarray assays of 20 fecal samples from AIDS patients. Twelve of these samples were positive for the presence of microsporidia and could be confidently identified; 11 of them were positive for more than one species. Our results suggested that this microarray-based approach represents an attractive diagnostic tool for high-throughput detection and identification of microsporidian species in clinical and epidemiological investigations.
Insights
A new microarray assay enables rapid, species-level identification of microsporidia, common enteric pathogens. This advanced diagnostic tool improves detection in clinical samples, especially for immunocompromised patients.
Area of Science:
- Medical Diagnostics
- Parasitology
- Molecular Biology
Background:
- Microsporidia are emerging enteric pathogens affecting both immunocompromised and immunocompetent individuals.
- Current diagnostic methods for microsporidia are labor-intensive, insensitive, and often fail to differentiate species.
- Species identification is crucial due to varying clinical significance and treatment approaches.
Purpose of the Study:
- To develop a novel protozoan oligonucleotide microarray assay for simultaneous detection and species-level identification of four key microsporidian species.
- To evaluate the sensitivity and specificity of the developed microarray assay.
- To assess the clinical applicability of the microarray assay using patient fecal samples.
Main Methods:
- Development of a microarray assay targeting the 18S small-subunit rRNA gene of microsporidia.
- Amplification of the target gene, labeling with a fluorescence dye, and hybridization to species-specific oligonucleotide probes on a microchip.
- Assay validation using known microsporidian species and testing on 20 fecal samples from AIDS patients.
Main Results:
- The microarray assay demonstrated high specificity and sensitivity, detecting as few as 10 microsporidian spores.
- Unique hybridization profiles allowed for accurate species identification.
- Out of 20 fecal samples, 12 were positive for microsporidia, with 11 samples showing co-infection by multiple species.
Conclusions:
- The developed microarray assay is a sensitive and specific tool for high-throughput detection and identification of microsporidian species.
- This approach offers a significant advancement over traditional diagnostic methods for microsporidiosis.
- The microarray assay shows promise for clinical and epidemiological investigations of microsporidian infections.
