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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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High-Density DNA and RNA microarrays - Photolithographic Synthesis, Hybridization and Preparation of Large Nucleic Acid Libraries

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Label-Free Method Using a Weighted-Phase Algorithm To Quantitate Nanoscale Interactions between Molecules on DNA

Qi Li¹, Rongxin Fu¹, Junqi Zhang¹

¹Department of Biomedical Engineering, Tsinghua University School of Medicine , Beijing 100084, PR China.

Analytical Chemistry

|February 24, 2017

Summary

This study introduces a corrected hyperspectral interferometry method for label-free nanoscale surface change detection. The improved technique offers high accuracy and a wide detection range, overcoming limitations of traditional white light interference methods.

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Metabolic Labeling and Profiling of Transfer RNAs Using Macroarrays

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Area of Science:

Nanotechnology
Surface Science
Biophysics

Background:

White light interference is a label-free technique for detecting nanoscale surface changes.
Conventional methods suffer from low signal-to-noise ratios, leading to inaccuracies.
There is a need for improved label-free detection methods with higher sensitivity and accuracy.

Purpose of the Study:

To develop and validate a corrected label-free method based on hyperspectral interferometry.
To overcome the limitations of low signal-to-noise ratio in traditional white light interference.
To quantitate molecular thickness variations on solid surfaces using a DNA hybridization microarray.

Main Methods:

Established a platform utilizing hyperspectral interferometry.
Constructed a DNA hybridization microarray for molecular detection.
Validated results against fluorescence resonance energy transfer (FRET).

Main Results:

Achieved a detection limit of 1.78 nm.
Demonstrated high accuracy and a wide detection range (5-64 bp).
The hyperspectral interferometry method requires no fluorescent labels.

Conclusions:

The corrected hyperspectral interferometry method offers a superior label-free approach for nanoscale surface analysis.
This technique provides significant advantages over conventional fluorescence-labeled methods.
The method is accurate, sensitive, and suitable for detecting molecular interactions on surfaces.