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Development and validation of event-specific quantitative PCR method for genetically modified maize MIR604.

Junichi Mano1, Satoshi Furui, Kaori Takashima

  • 1National Food Research Institute, National Agriculture and Food Research Organization, Tsukuba, Japan.

Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
|November 8, 2012
PubMed
Summary

A new real-time PCR method accurately quantifies genetically modified (GM) MIR604 maize. This validated method ensures reliable food labeling and monitoring of GM content in maize products.

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Area of Science:

  • Agricultural biotechnology
  • Molecular biology
  • Food science

Background:

  • Genetically modified (GM) maize event MIR604 is widely distributed.
  • Accurate quantification methods are needed for MIR604 maize to ensure food labeling compliance.

Purpose of the Study:

  • To develop and validate a novel real-time PCR method for quantifying MIR604 maize.
  • To establish a reliable analytical tool for monitoring GM food products.

Main Methods:

  • Developed real-time PCR assays using event-specific primers for MIR604 and an endogenous reference gene (starch synthase IIb).
  • Determined the conversion factor for calculating weight-based GM content from DNA copy number ratios.
  • Validated the method through an interlaboratory collaborative trial with blind samples at various mixing levels (0-10%).

Main Results:

  • The method demonstrated high specificity for MIR604 maize.
  • Reproducibility (RSDr) was less than 25%.
  • The limit of quantitation was determined to be 0.5% according to ISO 24276 guidelines.

Conclusions:

  • The developed real-time PCR method is suitable for practical quantitative analysis of MIR604 maize.
  • This method supports accurate monitoring of GM food labeling.
  • The validated assay provides a reliable tool for regulatory compliance.