Development of event-specific PCR detection methods for genetically modified tomato Huafan No. 1

Authors

  • Chao Yang,

    1. National Center for Molecular Characterization of Genetically Modified Organisms, SJTU-Bor Luh Food Safety Center, School of life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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  • Dabing Zhang,

    1. National Center for Molecular Characterization of Genetically Modified Organisms, SJTU-Bor Luh Food Safety Center, School of life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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  • Litao Yang

    Corresponding author
    • National Center for Molecular Characterization of Genetically Modified Organisms, SJTU-Bor Luh Food Safety Center, School of life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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Correspondence to: Litao Yang, National Center for Molecular Characterization of Genetically Modified Organisms, SJTU-Bor Luh Food Safety Center, School of life Science and Biotechnology Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China. E-mail: yylltt@sjtu.edu.cn

Abstract

Background

The genetically modified (GM) tomato Huafan No. 1 is a commercial GM event created in China, and the development of specific methods for its identification and quantification is necessary under labeling regulations for genetically modified organisms (GMOs). The event-specific polymerase chain reaction (PCR) method is the most used method for identification of GMOs in routine analysis.

Results

The 3′ junction sequence of transgene integration in GM Huafan No. 1 tomato was revealed by thermal asymmetric interlaced PCR (TAIL-PCR) and sequencing analysis. Based on the revealed 3′ integration junction sequence, both conventional and real-time PCR assays were developed and validated for GM Huafan No. 1 tomato identification. In the conventional PCR assay, the limit of detection (LOD) was 20 haploid genome copies. In the real-time PCR assay, the LOD and limit of quantification (LOQ) were estimated to be 5 and 10 tomato haploid genome copies, respectively. Furthermore, the developed PCR methods were well validated by in-house validation.

Conclusion

Our results suggest that the developed event-specific PCR methods can be routinely used for identification and quantification of GM Huafan No. 1 tomato.© 2012 Society of Chemical Industry

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