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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: May 11, 2026

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

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Published on: August 12, 2019

Optimized light-directed synthesis of aptamer microarrays.

Nicole L W Franssen-van Hal¹, Pepijn van der Putte, Klaus Hellmuth

¹FlexGen, J.H. Oortweg 21, 2333CH Leiden, The Netherlands.

Analytical Chemistry

|May 16, 2013

Summary

Optimizing aptamer microarrays for sensitive analyte detection requires different synthesis than DNA microarrays. Aptamer probe sensitivity differs in sequence fidelity, linker length, and surface density for enhanced detection.

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Area of Science:

Biotechnology
Molecular Diagnostics
Surface Chemistry

Background:

Aptamer microarrays offer high-throughput, ultrasensitive detection of multiple analytes.
Oligonucleotide microarray synthesis differs from aptamer microarray requirements due to distinct bioaffinity interactions.
Optimal synthesis parameters for aptamer microarrays remain underexplored.

Purpose of the Study:

To investigate the impact of synthesis parameters on aptamer microarray sensitivity.
To compare aptamer microarray synthesis requirements with traditional oligonucleotide microarrays.
To identify optimal conditions for streptavidin-binding DNA aptamer detection.

Main Methods:

Light-directed in situ synthesis of microarrays.
Analysis of sequence fidelity, linker length, surface probe density, and substrate functionalization effects.
Direct comparison with oligonucleotide hybridization experiments.

Main Results:

Aptamer microarrays exhibit higher sensitivity to sequence fidelity and substrate functionalization than oligonucleotide microarrays.
Optimal linker length (dT 11mer) and surface probe density differ significantly between aptamer and oligonucleotide probes.
Aptamer probes show reduced binding signal with sequence deletions, unlike hybridization probes, and are less constrained by surface group density.

Conclusions:

Aptamer microarray synthesis requires tailored parameters distinct from genomics applications.
Optimized sequence fidelity, linker length, and surface density are crucial for sensitive aptamer detection.
Aptamer microarrays present unique advantages and constraints regarding probe density and molecular crowding.