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DNA Microarrays

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Updated: Jun 13, 2026

Circulating MicroRNA Quantification Using DNA-binding Dye Chemistry and Droplet Digital PCR

Circulating MicroRNA Quantification Using DNA-binding Dye Chemistry and Droplet Digital PCR

Published on: June 26, 2016

Background-Free Nanopore Decoding of microRNA Expression Patterns Using Circular Diagnostic DNA.

Soma Emura¹, Nanami Takeuchi¹, Tomoko Ohshima²

¹Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.

Analytical Chemistry

|January 14, 2026

Summary

This summary is machine-generated.

A novel nanopore decoding method uses circular DNA constructs to accurately detect microRNA (miRNA) expression. This background-free approach enhances signal detection for improved diagnostics.

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Area of Science:

Biotechnology
Molecular Biology
Genomics

Background:

Nanopore sequencing faces challenges with background noise from non-target molecules.
Accurate microRNA (miRNA) detection is crucial for understanding gene regulation and disease diagnostics.
Existing nanopore methods struggle to differentiate specific miRNA signals from background noise.

Purpose of the Study:

To develop a background-free nanopore decoding method for identifying upregulated and downregulated microRNA (miRNA) expression patterns.
To enhance the signal-to-noise ratio in nanopore sensing for more reliable miRNA detection.
To demonstrate the potential of this method for portable and accessible cancer diagnostics.

Main Methods:

Utilized a circular DNA construct with complementary diagnostic DNAs (dgDNAs) on a MinION nanopore device.
Designed dgDNAs to form a closed structure, preventing translocation and eliminating background signals.
Target miRNA binding opens the circular structure, generating detectable dgDNA-miRNA complex events.

Main Results:

Achieved a background-free nanopore decoding system for miRNA detection.
Demonstrated improved signal-to-noise ratio, enabling reliable identification of specific miRNA expression patterns.
Successfully implemented the system on the MinION device for potential diagnostics.

Conclusions:

The developed method offers a robust solution for background-free miRNA profiling using nanopore technology.
This approach significantly improves the accuracy and reliability of miRNA detection.
The system shows promise for portable, point-of-care cancer diagnostics.