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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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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

Detection of genetically modified canola using multiplex PCR coupled with oligonucleotide microarray hybridization.

Anna-Mary Schmidt¹, Robert Sahota, Derek S Pope

¹Sidney Laboratory, Canadian Food Inspection Agency, 8801 East Saanich Road, Sidney, British Columbia V8L 1H3, Canada.

Journal of Agricultural and Food Chemistry

|July 19, 2008

Summary

A new multiplex PCR and DNA array method rapidly screens 12 approved genetically modified (GM) canola lines in Canada. This validated assay accurately detects transgenic elements in animal feed and canola meal.

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Area of Science:

Agricultural Biotechnology
Molecular Biology
Genetics

Background:

Genetically modified (GM) crops require robust detection methods for regulatory compliance and market access.
Existing methods for detecting transgenic elements in canola can be time-consuming and lack multiplexing capabilities.

Purpose of the Study:

To develop and validate a rapid, simultaneous screening method for 12 approved GM canola lines in Canada.
To establish a sensitive assay for detecting transgenic elements in various canola products.

Main Methods:

Development of a multiplex PCR assay coupled with an oligonucleotide DNA array.
Inclusion of construct-specific, common transgene elements, and endogenous gene targets.
Validation of oligonucleotide probes for specificity and functionality.
Determination of the limit of detection for key GM canola lines.

Main Results:

The method successfully detected all 12 approved GM canola lines simultaneously.
High specificity was observed, with no significant cross-hybridization between probes.
Limits of detection (0.1% to 0.5%) are below the European Union's 0.9% threshold.
The assay demonstrated effectiveness in detecting GM canola in animal feed and meal samples.

Conclusions:

A rapid and reliable multiplex PCR-DNA array method for concurrent screening of approved GM canola lines has been established.
This assay provides a valuable tool for regulatory bodies and industry for accurate GM canola detection.
The method's sensitivity and applicability to various matrices support its practical use in food and feed safety assessments.