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Multiplex, construct-specific, and real-time PCR-based analytical methods for Bt rice with cry1Ac gene.

Gurinder Jit Randhawa¹, Monika Singh

¹National Research Centre on DNA Fingerprinting, National Bureau of Plant Genetic Resources, Pusa Campus, New Delhi 110 002, India. gjr@nbpgr.ernet.in

Journal of AOAC International

|April 4, 2012

Summary

Developed PCR methods accurately detect Bacillus thuringiensis (Bt) rice, ensuring food safety and regulatory compliance. These assays identify the cry1Ac gene and genetic construct integrity for reliable GMO analysis.

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Area of Science:

Agricultural Biotechnology
Molecular Biology
Food Safety Analytics

Background:

Genetically modified (GM) crops, such as Bacillus thuringiensis (Bt) rice, require reliable detection methods for regulatory and consumer assurance.
The Bt rice hybrid MRP 5401 expresses a modified cry1Ac gene, necessitating specific analytical tools for its identification and quantification.

Purpose of the Study:

To develop and validate qualitative and quantitative Polymerase Chain Reaction (PCR) assays for the detection and quantification of Bt rice (MRP 5401).
To confirm the integrity of the inserted gene construct within the Bt rice.
To establish methods that meet regulatory standards for GM food analysis.

Main Methods:

Development of multiplex PCR assays targeting the cry1Ac transgene, Cauliflower mosaic virus (CaMV) 35S promoter, nopaline synthase (nos) terminator, and neomycin phosphotransferase II (nptLL) marker gene.
Nested PCR was employed to confirm the integrity of the 3.178 kb gene construct region.
Establishment of simplex PCR for cry1Ac gene detection with a Limit of Detection (LOD) of 0.01%.
Development of a real-time PCR assay for quantifying the cry1Ac gene, achieving LOD and Limit of Quantification (LOQ) values of 0.05%.

Main Results:

Multiplex and simplex PCR assays successfully identified specific genetic elements of the Bt rice construct.
Nested PCR confirmed the integrity of the amplified gene construct region.
The simplex PCR demonstrated a high sensitivity for detecting the cry1Ac gene down to 0.01%.
The real-time PCR assay met Codex Alimentarius Commission criteria, providing accurate quantification with 0.05% LOD and LOQ.

Conclusions:

Validated PCR assays provide reliable tools for identifying Bt rice and assessing genetic trait presence.
These methods are crucial for regulatory compliance, including accurate labeling and risk assessment prior to commercialization.
The developed assays can help address consumer concerns and potential legal disputes regarding GM rice.