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PCR-based identification of clinically relevant Pseudallescheria/Scedosporium strains
M Wedde1, D Müller, K Tintelnot
1Berlin University of Technology, Germany, FB 15, Department of Microbiology and Genetics, Berlin, Germany.
Abstract:
Pseudallescheria boydii (anamorph: Scedosporium apiospermum) and S. prolificans can cause severe infections in both the immunocompromized host and accidentally injured people. A species-specific polymerase chain reaction (PCR) enabling detection and discrimination of these fungi has not been available to date. In view of the difficult treatment especially of S. prolificans infections, a PCR-based detection system has been developed. Based on results of partial sequencing of ribosomal DNA, Scedosporium DNA could be amplified, either at the genus or at the species level. Hybridization probes for the identification of the PCR-products were established.
Insights
A new species-specific polymerase chain reaction (PCR) assay was developed to detect Pseudallescheria boydii and Scedosporium prolificans. This method aids in diagnosing severe fungal infections, especially those caused by S. prolificans.
Area of Science:
- Medical Mycology
- Molecular Biology
- Infectious Diseases
Background:
- Pseudallescheria boydii and Scedosporium prolificans cause severe infections in immunocompromised individuals and trauma patients.
- Accurate and rapid diagnostic methods are crucial for effective treatment, particularly for S. prolificans, which is difficult to treat.
- Current diagnostic techniques lack species-specific identification for these fungi.
Purpose of the Study:
- To develop a species-specific polymerase chain reaction (PCR) assay for the detection and differentiation of P. boydii and S. prolificans.
- To provide a molecular tool for timely diagnosis of infections caused by these opportunistic fungi.
Main Methods:
- Partial sequencing of ribosomal DNA (rDNA) was performed to identify unique genetic markers.
- Species-specific PCR primers were designed to amplify Scedosporium DNA at both genus and species levels.
- Hybridization probes were developed for accurate identification of PCR amplification products.
Main Results:
- A novel PCR assay successfully amplified Scedosporium DNA, enabling genus-level detection.
- The assay demonstrated species-specific amplification, differentiating between P. boydii and S. prolificans.
- Established hybridization probes facilitated precise identification of the amplified fungal DNA.
Conclusions:
- The developed PCR assay provides a reliable and specific method for detecting and differentiating P. boydii and S. prolificans.
- This molecular diagnostic tool can significantly improve the management of severe fungal infections caused by these agents.
- The availability of this assay is expected to aid clinicians in selecting appropriate antifungal therapies, especially for challenging S. prolificans infections.