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Detection of miRNA Targets in High-throughput Using the 3'LIFE Assay

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Single-MicroRNA Detection on High-Selectivity Metasurface Fluorescence Biosensors.

Masanobu Iwanaga¹

¹Research Center for Electronic and Optical Materials, National Institute for Materials Science (NIMS)RINGGOLD, 1-1 Namiki, Tsukuba 305-0044, Japan.

|October 28, 2025

Summary

Researchers developed a highly sensitive metasurface fluorescence biosensor for detecting single microRNAs (miRNAs) at subattomolar levels. This breakthrough surpasses current digital PCR sensitivity, enabling precise cancer-related miRNA identification even in complex mixtures.

Keywords:

biosensor metasurface microRNA selective biosensing single-molecule detection

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Published on: October 7, 2025

Area of Science:

Biotechnology
Nanotechnology
Molecular Biology

Background:

MicroRNAs (miRNAs) are crucial biomarkers for various biological activities and diseases.
Next-generation diagnostics require sensitive methods for analyzing abundant biological data, particularly from miRNAs.
Current detection methods face limitations in sensitivity and specificity for low-concentration miRNA analysis.

Purpose of the Study:

To demonstrate single-miRNA detection with unprecedented sensitivity using metasurface fluorescence biosensors.
To achieve highly precise discrimination of miRNAs at the subattomolar level.
To validate the biosensor's capability for detecting cancer-associated miRNAs in complex biological samples.

Main Methods:

Development of optimized all-dielectric nanostructured metasurface fluorescence biosensors.
Integration of optimized reverse transcription (RT) and polymerase chain reaction (PCR) with false reaction suppression.
Design of target-selective oligo DNA probes for highly efficient fluorescence detection of miRNA amplicons.

Main Results:

Achieved single-miRNA detection and discrimination at the subattomolar level, surpassing digital PCR sensitivity.
Demonstrated specific detection of a cancer-correlated miRNA present in a mixture with another miRNA.
Validated the high sensitivity and specificity of the metasurface biosensor for miRNA analysis.

Conclusions:

Metasurface fluorescence biosensors offer a powerful platform for ultra-sensitive miRNA detection.
The developed method provides a significant advancement for next-generation diagnostics and biomarker discovery.
This technology holds promise for early disease detection and personalized medicine through precise miRNA profiling.