Comparison and transfer testing of multiplex ligation detection methods for GM plants

Area of Science:

• Molecular Biology
• Biotechnology
• Food Safety

Background:

• European Union regulations for genetically modified organisms (GMOs) are becoming more complex due to the increasing number of GMOs available.
• Simultaneous, sensitive detection of multiple GMO targets in food and feed samples is crucial for regulatory compliance.
• Existing DNA-based multiplex detection methods, particularly multiplex ligation detection methods, vary significantly in their protocols.

Purpose of the Study:

• To investigate the influence of different ligation protocols on the performance of padlock probes (PLPs) in real-time PCR.
• To evaluate the sensitivity and specificity of selected PLPs and ligation protocols for simultaneous GMO detection.
• To validate a chosen method through an interlaboratory exchange study.

Main Methods:

• Comparison of various multiplex ligation-dependent probe amplification (MLPA) protocols using real-time PCR.
• Testing the specificity of up to twenty padlock probes (PLPs).
• Validation of the optimal method in an interlaboratory exchange study involving two institutes.

Main Results:

• Two MLPA protocols, PPLMD I and PPLMD II, demonstrated superior performance with no significant differences observed between them.
• The optimized method successfully detected up to 13 different GMO targets simultaneously and specifically.
• The interlaboratory exchange study confirmed consistent results between participating institutes, meeting the 0.1% sensitivity criterion.

Conclusions:

• Two MLPA protocols are equally effective for specific and sensitive multidetection of GMO targets.
• The validated method successfully achieves simultaneous detection of 13 GMO targets, meeting regulatory sensitivity requirements.
• This study confirms the feasibility of specific and sensitive multidetection of GMO targets in food and feed samples.