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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: Sep 11, 2025

Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres

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Published on: October 23, 2011

Molecular Encoded Beads for Multiplexed Nucleic Acid Quantitative Detection.

Wen Cheng¹, Wanyan Zeng¹, Jiahao Fan¹

¹State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Key Laboratory for Bio-Nanotechnology and Molecular Engineering of Hunan Province, Hunan University, Changsha 410082, P. R. China.

Analytical Chemistry

|August 18, 2025

Summary

This summary is machine-generated.

This study enhances DNA coding for multiplex nucleic acid detection, improving probe design and introducing a new dye for precise quantification. The advanced platform enables rapid, high-throughput analysis of eight nucleic acids simultaneously.

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Last Updated: Sep 11, 2025

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Area of Science:

Biotechnology
Molecular Biology
Analytical Chemistry

Background:

Previous DNA coding methods faced limitations in quantitative detection and multiplexing capabilities.
Accurate and efficient quantification of multiple nucleic acids is crucial for various biological and diagnostic applications.

Purpose of the Study:

To present an improved DNA coding method with enhanced quantitative detection capabilities.
To develop a versatile platform for rapid, robust, and high-throughput multiplex nucleic acid analysis.

Main Methods:

Incorporated three key modifications: altered hybridization regions in coding probes, changed bead types, and added a third fluorescent dye.
Developed a trifluorophore system for simultaneous quantification of eight distinct nucleic acids.
Utilized flow cytometry with a simplified two-excitation and three-emission channel system.

Main Results:

Achieved detection limits at the picomolar (pM) level, meeting sensitivity requirements for multiplex analysis.
Demonstrated simultaneous encoding and target detection, simplifying the workflow.
Successfully quantified eight distinct nucleic acids concurrently using the developed system.

Conclusions:

The improved DNA coding method offers a versatile and efficient platform for quantitative nucleic acid detection.
This plug-and-play strategy significantly advances multiplex nucleic acid analysis, enabling rapid and robust high-throughput applications.