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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: Oct 2, 2025

mirMachine: A One-Stop Shop for Plant miRNA Annotation

mirMachine: A One-Stop Shop for Plant miRNA Annotation

Published on: May 1, 2021

A highly sensitive PNA-microarray system for miRNA122 recognition.

Giuseppe Forte¹, Giorgio Ventimiglia², Massimiliano Pesaturo³

¹Department of Drug Science and Health, University of Catania, Catania, Italy.

Biotechnology Journal

|February 28, 2022

Summary

This summary is machine-generated.

This study presents an advanced PNA-microarray for sensitive miRNA detection, enhancing optical signals using a Si/Al/Agarose system. This novel biosensor achieves high sensitivity for environmental monitoring and public safety applications.

Keywords:

PNA-microarray hybridization agarose surface biosensor miRNA

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Area of Science:

Biosensor Technology
Surface Chemistry
Molecular Diagnostics

Background:

Sensitive biosensor development relies heavily on surface chemistry.
Microarray technology offers a platform for high-throughput detection.
Detection of microRNA (miRNA) is crucial for various applications.

Purpose of the Study:

To develop an advanced PNA-microarray system for enhanced miRNA detection.
To investigate the optical signal enhancement mechanisms in the PNA-microarray.
To evaluate the sensitivity and detection limits for specific miRNA targets.

Main Methods:

Fabrication of a multilayered Si/Al/Agarose PNA-microarray.
Utilizing Al film for optical signal enhancement via a mirror effect.
Employing agarose film for constructive interference of fluorescent labels (Cy5).
Investigating miRNA_122 detection using the PNA-microarray.
Performing Molecular Dynamic simulations to study PNA-RNA interactions.

Main Results:

Achieved straightforward optical signal enhancement through combined Al mirror effect and agarose interference.
Demonstrated high sensitivity of approximately 1.75 μM⁻¹ for miRNA_122 detection.
Obtained a Limit of Detection in the range of 0.043 nM for miRNA_122.
Molecular Dynamic simulations confirmed the contribution of agarose to dsPNA-RNA interactions via H-bonds at different temperatures.

Conclusions:

The developed PNA-microarray system offers enhanced sensitivity and optical signal amplification for miRNA detection.
The combination of materials and optical principles provides a robust platform for biosensing.
This technology holds promise for advanced sensing strategies in environmental monitoring and public safety.