New Platform for the Direct Profiling of microRNAs in Biofluids.

Area of Science:

• Biomarker Discovery
• Molecular Diagnostics
• Bioanalytical Chemistry

Background:

• Circulating microRNAs (miRNAs) show promise as biomarkers for disease detection and prognosis.
• Current miRNA detection methods are often complex, costly, and unsuitable for routine clinical diagnostics.
• There is a need for robust, efficient, and cost-effective assays for circulating miRNA profiling.

Purpose of the Study:

• To develop a novel platform for the direct profiling of circulating microRNAs.
• To create a cost-effective and robust assay for miRNA detection in biological fluids.
• To demonstrate the diagnostic utility of the developed platform for disease-related miRNA biomarkers.

Main Methods:

• Development of a platform integrating a silicon photomultiplier-based reader with a novel chemical nucleic acid detection method.
• Design and synthesis of reagents for a chemiluminescent reaction enabling direct miRNA detection.
• Validation of platform sensitivity using hsa-miR-21-5p spike-ins and detection in non-small cell lung cancer plasma samples.

Main Results:

• Achieved accurate miRNA profiling without the need for extraction, pre-amplification, or pre-labeling.
• Determined a limit of detection of 4.7 pmol/L for hsa-miR-21-5p.
• Successfully detected hsa-miR-21-5p directly in plasma samples from non-small cell lung cancer patients.

Conclusions:

• The developed platform offers a breakthrough in circulating microRNA profiling.
• The integration of a novel chemical detection method and a compact reader provides diagnostic utility.
• This innovative approach enables direct qualitative and quantitative analysis of miRNA biomarkers in biological fluids.