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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: Jun 25, 2026

Primer-Free Aptamer Selection Using A Random DNA Library

Primer-Free Aptamer Selection Using A Random DNA Library

Published on: July 26, 2010

Enhancement of aptamer microarray sensitivity through spacer optimization and avidity effect.

Yeh-Hsing Lao¹, Konan Peck, Lin-Chi Chen

¹Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei 10617, Taiwan.

Analytical Chemistry

|February 6, 2009

Summary

This summary is machine-generated.

This study enhances aptamer microarrays for ultrasensitive protein detection. By using specific spacers and combining aptamers, researchers achieved a 100-1000 fold increase in sensitivity for thrombin detection in complex samples.

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Area of Science:

Biotechnology
Analytical Chemistry
Molecular Diagnostics

Background:

Aptamer microarrays offer potential for sensitive protein detection.
Existing aptamer-based methods struggle with sensitivity in complex biological samples like serum.

Purpose of the Study:

To develop an ultrasensitive aptamer microarray for detecting thrombin in complex biological matrices.
To investigate the impact of different spacers and aptamer combinations on detection sensitivity.

Main Methods:

Utilized two distinct aptamers (HTQ and HTDQ) targeting different thrombin epitopes on a microarray.
Investigated the effect of dodecyl and oligodeoxythymidine (oligo(dT)) spacers on signal response.
Explored the avidity effect by co-printing distinct aptamers on the same spot.

Main Results:

Oligo(dT) spacers significantly enhanced microarray signal response compared to dodecyl spacers.
Co-printing distinct aptamers created a bivalent molecular construct exhibiting an avidity effect.
The optimized microarray achieved picomolar-level thrombin detection in the presence of high concentrations of serum total protein.

Conclusions:

The synergistic combination of oligo(dT) spacers and aptamer avidity dramatically enhances microarray sensitivity.
This approach represents a significant improvement (100-1000 fold) over individual aptamer detection without spacers.
The developed aptamer microarray shows promise for ultrasensitive protein detection in complex biological samples.