[A detection method for recombinant DNA from genetically modified potato (NewLeaf Y potato)]

Area of Science:

• Molecular Biology
• Food Science
• Biotechnology

Context:

• Genetically modified (GM) potatoes, specifically NewLeaf Y (NL-Y) variety, require mandatory assessment in Japan.
• Existing detection methods may yield false positives in processed foods, particularly those infected with potato virus Y (PVY).
• Accurate detection of GM ingredients is crucial for regulatory compliance and consumer safety.

Purpose:

• To develop and validate a specific polymerase chain reaction (PCR) based detection method for GM NewLeaf Y (NL-Y) potatoes.
• To establish an internal control using the potato sucrose synthase gene for reliable quantification.
• To design primer pairs capable of distinguishing NL-Y from PVY contamination and detecting other GM potato varieties (NL, NL-P).

Summary:

• A novel PCR method was established using specific primer pairs to detect NL-Y potato DNA.
• The method utilizes the potato sucrose synthase gene as an internal control and achieves detection limits as low as 0.05% NL-Y in potato powder.
• Additional primer pairs were designed to detect other GM potato lines (NL, NL-P) by targeting the CryIIIA and p-FMV genes.
• Application of the developed method to 26 processed potato food samples confirmed the absence of NL-Y in all tested products.

Impact:

• Provides a reliable and specific tool for identifying GM potatoes in food products, aiding regulatory oversight.
• Enhances food safety by enabling accurate detection of undeclared GM ingredients.
• Facilitates compliance with regulations regarding GM food assessments and labeling.