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[Development and validation of event-specific quantitative PCR method for genetically modified maize LY038].

Junichi Mano1, Tomoko Masubuchi, Shuko Hatano

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

Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
|March 9, 2013
PubMed
Summary

A new real-time PCR method accurately quantifies genetically modified (GM) maize event LY038. This validated method is suitable for routine testing of GM organisms (GMOs) in food products.

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Area of Science:

  • Agricultural Biotechnology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Accurate quantification of genetically modified (GM) crops is essential for regulatory compliance and food safety.
  • The GM maize event LY038 requires a specific and reliable analytical method for its detection and quantification.
  • Existing methods may lack the specificity or validation required for international standards.

Purpose of the Study:

  • To develop and validate a novel real-time PCR-based analytical method for the accurate quantification of GM maize event LY038.
  • To establish a reliable method for determining the weight-based content of GM organisms (GMOs).
  • To assess the method's performance through an interlaboratory collaborative trial.

Main Methods:

  • Design of specific real-time PCR (polymerase chain reaction) amplifications targeting the LY038 event and an endogenous maize reference gene.
  • Confirmation of PCR specificity and linearity.
  • Determination of a conversion factor for weight-based GMO content calculation.
  • Validation via an interlaboratory collaborative trial with blind DNA samples at various mixing levels (0-10%).

Main Results:

  • The developed real-time PCR method demonstrated high specificity and linearity for LY038 quantification.
  • An interlaboratory trial confirmed the method's suitability, with precision (RSDR) values below 25%.
  • The limit of quantification was determined to be 0.5%, adhering to ISO 24276 guidelines.

Conclusions:

  • The novel real-time PCR method provides accurate and reliable quantification of GM maize event LY038.
  • The method is validated for practical application in testing GMO content in food matrices.
  • This analytical approach supports regulatory oversight and consumer safety for GM crops.