[PCR detection of transgenic elements in feed raw material]

Area of Science:

• Molecular Biology
• Biotechnology
• Food Safety

Context:

• The increasing prevalence of genetically modified (GM) crops necessitates reliable detection methods for feed ingredients.
• Transgenic elements, including the cauliflower mosaic virus 35S promoter (35S-promoter) and nopaline synthase terminator (NOS terminator), are commonly used in GM crop development.
• Specific genes like EPSPS (5-enolpyruvylshikimate-3-phosphate synthase) and CryIA(b) delta-endotoxin are engineered into crops for herbicide resistance and insecticidal properties.

Purpose:

• To establish a Polymerase Chain Reaction (PCR) based method for detecting specific transgenic agents in feed raw materials.
• To validate the detection of common transgenic elements originating from cauliflower mosaic virus and Agrobacterium tumefaciens.
• To confirm the presence or absence of engineered genes such as EPSPS and CryIA(b) in soybean dregs and corn gluten meal.

Summary:

• A PCR technique was optimized using primers targeting the 35S promoter, NOS terminator, EPSPS gene, and CryIA(b) gene.
• Endogenous genes (corn Zein, soybean Lectin) and control samples were utilized to ensure accuracy and prevent false positives/negatives.
• The developed method demonstrated successful detection of transgenic elements in imported feed raw materials, specifically soybean dregs and corn gluten meal.

Impact:

• Provides a validated analytical method for the accurate identification of GMOs in animal feed.
• Contributes to ensuring the safety and regulatory compliance of the animal feed supply chain.
• Supports international trade by offering a reliable tool for verifying the composition of imported feed ingredients.