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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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Competitive Genomic Screens of Barcoded Yeast Libraries

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Optical Thickness-Encoded Suspension Array for High-Throughput Multiplexed Gene Detection.

Huiying Ma¹, Xuejing Chen², Bangrong Lu¹

¹School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.

Sensors (Basel, Switzerland)

|December 15, 2019

Summary

This summary is machine-generated.

We developed a novel optical thickness-encoded suspension array (SA) using micro-quartz pieces (MQPs) for DNA detection. This method enables specific, repeatable, and multiplexed DNA analysis with high sensitivity.

Keywords:

dual wavelength digital holographic phase fluorescence microscope micro-quartz pieces multiplexed DNA detection optical thickness coding suspension array

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Area of Science:

Biotechnology
Nanotechnology
Analytical Chemistry

Background:

Suspension arrays (SA) are widely used for multiplexed biomolecule detection.
Existing SA methods face challenges in encoding capacity and multiplexing capabilities.
Micro-quartz pieces (MQPs) offer potential for novel SA encoding strategies.

Purpose of the Study:

To develop and validate a novel optical thickness-encoded SA system for DNA detection.
To demonstrate the specificity, sensitivity, and repeatability of the proposed method.
To confirm the feasibility of multiplexed DNA detection using this platform.

Main Methods:

Grafting capture probes (cDNA) onto MQPs of varying optical thicknesses for encoding.
Utilizing a double-probe sandwich structure with quantum dot-labeled signal probes for target DNA (tDNA) detection.
Employing a dual-wavelength digital holographic phase fluorescence microscope for decoding and detection.
Conducting control, concentration gradient, and multiplexed detection experiments.

Main Results:

The optical thickness-encoded SA demonstrated high specificity in DNA detection through control experiments.
Analyte concentration response was confirmed via concentration gradient experiments.
Successful multiplexed detection of three different DNA types in a single sample was achieved.
Stable, highly specific, and repeatable detection results were obtained.

Conclusions:

The proposed optical thickness-encoded SA based on MQPs is a feasible and effective platform for DNA detection.
This method offers high specificity, good repeatability, and potential for multiplexed analysis.
The dual-wavelength digital holographic microscopy system provides robust decoding capabilities for this SA platform.