Simple, fast, reliable: multiplex digital PCR quantification of 19 genetically modified soybean events

Area of Science:

• Agricultural biotechnology
• Molecular biology
• Analytical chemistry

Background:

• Modern agriculture increasingly utilizes plant genetic engineering, leading to a rise in genetically modified (GM) crop varieties.
• Regulatory bodies require high-throughput, multi-target analytical methods for detecting and quantifying GM content in crops.
• Existing methods may lack the comprehensiveness or efficiency needed for routine monitoring.

Purpose of the Study:

• To develop and validate a multiplex digital PCR (dPCR) method for the simultaneous detection and quantification of multiple GM soybean events.
• To establish a high-throughput analytical approach suitable for regulatory compliance and routine GM crop monitoring.
• To create a comprehensive quantification strategy for GM soybeans that simplifies workflow and promotes widespread adoption.

Main Methods:

• Development of four 5-plex digital PCR (dPCR) assays for simultaneous detection of 19 GM soybean events and the lectin (Le1) endogenous gene.
• Utilization of a nanowell plate-based, all-in-one dPCR system with multiple fluorescence detection channels.
• Validation of assays against minimum performance requirements including specificity, trueness, precision, sensitivity, and dynamic range.

Main Results:

• The developed multiplex dPCR method successfully quantified 19 GM soybean events and the Le1 endogene.
• The four 5-plex assays met all minimum performance requirements for routine GM crop analysis.
• This represents the most comprehensive multi-target GM soybean quantification method to date, requiring no prior screening.

Conclusions:

• The presented multiplex dPCR method offers a robust, efficient, and comprehensive solution for GM soybean quantification.
• The simplified workflow and validated performance make the method suitable for widespread adoption in regulatory settings.
• This study establishes a precedent for developing rapid, multiplex dPCR assays for evolving GM crop monitoring demands.