MicroRNA Detection Techniques in Clinical and Research Applications

MicroRNAs (miRNAs) are short non-coding RNA molecules that regulate gene expression post-transcriptionally and have emerged as critical biomarkers across a spectrum of diseases, including cancer, cardiovascular and neurodegenerative disorders. Their small size, stability in bodily fluids and disease-specific expression profiles have propelled the development of highly sensitive and specific detection methods. Traditional approaches based on quantitative PCR have evolved with the inclusion of stem-loop primers and locked nucleic acids, enhancing specificity and dynamic range. Emerging platforms integrate nanotechnology, molecular probes and amplification strategies—both thermal and isothermal—to achieve femtomolar sensitivity and single-molecule resolution. Key innovations include amplification-free single-molecule imaging, electro-optical nanopore sensing and microfluidic colourimetric assays, each offering advantages for multiplexed analysis, rapid turnaround and minimal sample volumes. Such techniques are driving forward liquid biopsy applications, enabling early diagnosis, real-time disease monitoring and personalised treatment decisions. Overall, the field is moving towards point-of-care compatibility, high-throughput multiplexing and robust clinical translation of miRNA profiling technologies.

Research from Nature Portfolio

Recent work has introduced size-encoded molecular probes coupled with electro-optical nanopore sensing to achieve ultrasensitive, sequence-specific and multiplexed detection of circulating miRNAs directly in unprocessed human serum. This platform attains femtomolar limits of detection and single-base mismatch discrimination, enabling simultaneous monitoring of distinct miRNA signatures in minimal sample volumes. Another advance employs an amplification-free, multi-colour single-molecule imaging approach in which Argonaute proteins preloaded with fluorescent probes accelerate hybridisation kinetics. By counting individual fluorescence spots, absolute miRNA copy numbers can be determined with high specificity, even in a single cell. These techniques exemplify the shift towards amplification-free, high-precision profiling that is readily adaptable for clinical use.

MicroRNA Detection Techniques in Clinical and Research Applications publication trend

The graph below shows the total number of articles in microrna detection techniques in clinical and research applications across all publications each year (not limited to Nature Index journals).

Technical terms

microRNA (miRNA): Short (19–24 nt) non-coding RNA molecules that regulate gene expression by targeting messenger RNAs.

Liquid biopsy: A minimally invasive technique for detecting biomolecules, such as miRNAs, in bodily fluids to monitor disease status.

Nanopore sensing: A detection method in which individual molecules translocate through a nanoscale pore, generating characteristic electrical or optical signals.

Isothermal amplification: Nucleic acid amplification conducted at a constant temperature, enabling simpler equipment and rapid assay times.

Multiplexing: Simultaneous detection and quantification of multiple targets within a single assay.

Point-of-care testing: Diagnostic testing performed at or near the site of patient care, providing rapid results without central laboratory infrastructure.

References

1. A Versatile Method to Design Stem-Loop Primer-Based Quantitative PCR Assays for Detecting Small Regulatory RNA Molecules. PLOS ONE (2013).
2. Point‐of‐Care Testing for the Detection of MicroRNAs: Towards Liquid Biopsy on a Chip. Angewandte Chemie International Edition (2023).
3. Advances in multiplexed techniques for the detection and quantification of microRNAs. Chemical Society Reviews (2021).
4. Hydrogel-Based Colorimetric Assay for Multiplexed MicroRNA Detection in a Microfluidic Device. Analytical Chemistry (2020).
5. Single-molecule amplification-free multiplexed detection of circulating microRNA cancer biomarkers from serum. Nature Communications (2021).