Rapid identification of black grain eumycetoma causative agents using rolling circle amplification

Area of Science:

• Medical Mycology
• Molecular Diagnostics
• Infectious Diseases

Background:

• Accurate identification of mycetoma causative agents is crucial for effective treatment and epidemiological studies.
• Current diagnostic tools for mycetoma often fall short in reliability and efficiency.
• Black grain eumycetoma requires specific identification for targeted therapeutic strategies.

Purpose of the Study:

• To introduce a rapid, simple, and highly efficient molecular method for identifying black grain eumycetoma agents.
• To develop a diagnostic tool that improves upon existing methods for mycetoma diagnosis in endemic areas.
• To provide a reliable method for the specific identification of key mycetoma-causing fungal species.

Main Methods:

• Development of an isothermal Rolling Circle Amplification (RCA) assay.
• Utilization of species-specific padlock probes targeting Internal Transcribed Spacer (ITS) DNA sequences.
• Testing the assay on 62 isolates, including Falciformispora, Madurella, Medicopsis, and Trematosphaeria species.

Main Results:

• The isothermal RCA assay successfully identified 62 mycetoma isolates with 100% specificity.
• The method demonstrated no cross-reactivity or false positive/negative results.
• The assay is highly reproducible and can be completed within a single day.

Conclusions:

• The developed isothermal RCA assay offers a low-cost, highly specific, and simple method for identifying black grain eumycetoma agents.
• This technique significantly improves diagnostic capabilities for mycetoma in resource-limited and endemic settings.
• The RCA assay provides a reliable and rapid tool for both clinical diagnosis and epidemiological surveillance of mycetoma.