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Qualitative and Quantitative PCR-Based Detection Methods for Authorized Genetically Modified Cotton Events in India
Rashmi Chhabra1, Gurinder Jit Randhawa, Rajesh K Bhoge
1Indian Council of Agricultural Research - National Bureau of Plant Genetic Resources, Genomic Resources Division, New Delhi 110 012, India.
Journal of AOAC International
|April 24, 2015
Summary
This study introduces novel multiplex and real-time PCR methods for detecting genetically modified (GM) insect-resistant Bt cotton events in India. These assays ensure accurate identification and authenticity testing of GM cotton seeds.
Area of Science:
- Agricultural Biotechnology
- Molecular Biology
- Genetics
Background:
- India has commercialized five insect-resistant genetically modified (GM) cotton events.
- Accurate detection methods are crucial for regulatory compliance and seed authenticity.
- Existing detection methods may not cover all commercialized events or offer sufficient sensitivity.
Purpose of the Study:
- To develop and validate qualitative and quantitative molecular diagnostic assays for commercialized GM insect-resistant cotton events in India.
- To establish cost-effective and robust methods for screening GM cotton presence and authenticity.
- To cover the majority of GM cotton cultivation in India with the developed assays.
Main Methods:
- Development of a decaplex multiplex PCR (MPCR) assay targeting nine transgenic elements for qualitative detection of five Bt cotton events (MON531, MON15985, Event 1, GFM-cry1A, MLS-9124).
- Development of a construct-specific real-time PCR assay for quantitative detection of four major Bt cotton events (MON531, MON15985, Event 1, GFM-cry1A).
- Determination of Limit of Detection (LOD) and Limit of Quantification (LOQ) for both qualitative and quantitative assays.
Main Results:
- A robust, cost-effective MPCR assay was developed, capable of distinguishing all five commercialized Bt cotton events with an LOD up to 0.1%.
- A sensitive real-time PCR assay was established for quantifying four key GM cotton events, covering 99.5% of GM cultivation, with LOQ <0.05% and LOD <0.025%.
- The assays successfully screened for the presence/absence of authorized GM cotton events and verified seed authenticity.
Conclusions:
- The developed qualitative and quantitative PCR assays provide reliable tools for monitoring GM cotton in India.
- These assays are essential for regulatory bodies, researchers, and the agricultural industry to ensure compliance and product integrity.
- The methods contribute to the responsible deployment and management of genetically modified crops.
