DNA enrichment approaches to identify unauthorized genetically modified organisms (GMOs)

Area of Science:

• Food safety and biotechnology
• Genomic analysis and detection methods

Background:

• Global production of genetically modified (GM) plants increases the risk of unauthorized GM organisms (UGMOs) entering the food chain.
• Detecting UGMOs is difficult due to limited available sequence information.
• Existing PCR-based methods are effective only for known UGMOs in specific cases.

Purpose of the Study:

• To review DNA enrichment techniques, specifically gene walking (GW), for identifying UGMOs.
• To evaluate the applicability of GW coupled with next-generation sequencing (NGS) for UGMO detection in food and feed.
• To provide an overview of these advanced detection strategies.

Main Methods:

• Review of gene walking (chromosome walking) techniques for DNA enrichment.
• Integration of enrichment approaches with next-generation sequencing (NGS) analysis.
• Evaluation of applicability in complex food and feed matrices.

Main Results:

• Gene walking (GW) combined with NGS is a viable strategy for detecting unknown adjacent sequences to known GM elements.
• These enrichment approaches have demonstrated success in medical and microbiological fields.
• The review assesses the potential of these methods for identifying UGMOs in diverse food and feed samples.

Conclusions:

• Gene walking coupled with NGS presents a powerful tool for identifying unknown genetically modified organisms in food.
• This approach overcomes limitations of traditional methods when sequence information is scarce.
• Further evaluation is recommended for robust implementation in food safety surveillance.