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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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Related Experiment Video

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Visual Detection of Multiple Nucleic Acids in a Capillary Array

Visual Detection of Multiple Nucleic Acids in a Capillary Array

Published on: November 15, 2017

An event-specific DNA microarray to identify genetically modified organisms in processed foods.

Jae-Hwan Kim¹, Su-Youn Kim, Hyungjae Lee

¹Institute of Life Sciences & Resources and Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea.

Journal of Agricultural and Food Chemistry

|May 5, 2010

Summary

A new DNA microarray system accurately detects 19 genetically modified organisms (GMOs), including specific GM maize events. This technology reliably identified GM maize in 11 of 37 tested food products.

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Area of Science:

Agricultural Biotechnology
Molecular Biology
Food Science

Background:

Genetically modified organisms (GMOs) are increasingly prevalent in the food supply.
Accurate detection of specific GMO events is crucial for regulatory compliance and consumer information.
Existing detection methods may lack the specificity or multiplexing capability for comprehensive GMO screening.

Purpose of the Study:

To develop and validate an event-specific DNA microarray system for identifying multiple GMOs.
To assess the system's capability in detecting specific genetically modified maize events in commercial food products.

Main Methods:

Development of a DNA microarray with 27 oligonucleotide probes targeting specific GMO events, screening targets (35S promoter, nos terminator), and reference genes (18S rRNA).
Application of multiplex PCR coupled with microarray analysis for simultaneous detection of thirteen GM maize events.
Testing of 37 maize-containing food products from South Korean and US markets.

Main Results:

The developed microarray system successfully identified 19 GMOs, including specific events in soybeans, maize, canola, and cotton.
Simultaneous detection of thirteen GM maize events was achieved with a limit of detection around 0.5%.
GM maize was detected in 11 out of 37 tested food samples, demonstrating the system's practical application.

Conclusions:

The event-specific DNA microarray system provides a reliable and efficient method for GMO detection in processed foods.
This technology enables simultaneous identification of multiple GMO events, enhancing screening capabilities.
The findings support the utility of microarray-based detection for ensuring food safety and regulatory adherence regarding GMOs.