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Detection and characterization of recombinant DNA expressing vip3A-type insecticidal gene in GMOs—standard single, multiplex and construct-specific PCR assays

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Abstract

Vegetative insecticidal protein (Vip), a unique class of insecticidal protein, is now part of transgenic plants for conferring resistance against lepidopteron pests. In order to address the imminent regulatory need for detection and labeling of vip3A carrying genetically modified (GM) products, we have developed a standard single PCR and a multiplex PCR assay. As far as we are aware, this is the first report on PCR-based detection of a vip3A-type gene (vip-s) in transgenic cotton and tobacco. Our assay involves amplification of a 284-bp region of the vip-s gene. This assay can possibly detect as many as 20 natural wild-type isolates bearing a vip3A-like gene and two synthetic genes of vip3A in transgenic plants. The limit of detection as established by our assay for GM trait (vip-s) is 0.1%. Spiking with nontarget DNA originating from diverse plant sources had no inhibitory effect on vip-s detection. Since autoclaving of vip-s bearing GM leaf samples showed no deterioration/interference in detection efficacy, the assay seems to be suitable for processed food products as well. The vip-s amplicon identity was reconfirmed by restriction endonuclease assay. The primer set for vip-s was equally effective in a multiplex PCR assay format (duplex, triplex and quadruplex), used in conjunction with the primer sets for the npt-II selectable marker gene, Cauliflower mosaic virus 35S promoter and nopaline synthetase terminator, enabling concurrent detection of the transgene, regulatory sequences and marker gene. Further, the entire transgene construct was amplified using the forward primer of the promoter and the reverse primer of the terminator. The resultant amplicon served as a template for nested PCR to confirm the construct integrity. The method is suitable for screening any vip3A-carrying GM plant and food. The availability of a reliable PCR assay method prior to commercial release of vip3A-based transgenic crops and food would facilitate rapid and efficient regulatory compliance.

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Acknowledgements

This work was supported by a research grant from the Department of Biotechnology, India. The authors thank Sameer Sawant, National Botanical Research Institute, Lucknow, for meaningful discussions and critical review of the manuscript.

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Authors and Affiliations

  1. Industrial Toxicology Research Centre, Post Box No. 80, M. G. Marg, Lucknow, 226001, Uttar Pradesh, India

    Chandra K. Singh, Abhishek Ojha & Devendra N. Kachru

  2. International Centre for Genetic Engineering and Biotechnology, New Delhi, Aruna Asaf Ali Marg, New Delhi, 110 067, India

    Raj K. Bhatanagar

Authors
  1. Chandra K. Singh
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  2. Abhishek Ojha
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  3. Raj K. Bhatanagar
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  4. Devendra N. Kachru
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Corresponding author

Correspondence to Devendra N. Kachru.

Additional information

An application for an Indian patent (1891/DEL2006/17.08.07) comprising a substantive part of this study has been filed.

ITRC communication no. 2516.

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216_2007_1714_MOESM1_ESM.pdf

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Singh, C.K., Ojha, A., Bhatanagar, R.K. et al. Detection and characterization of recombinant DNA expressing vip3A-type insecticidal gene in GMOs—standard single, multiplex and construct-specific PCR assays. Anal Bioanal Chem 390, 377–387 (2008). https://doi.org/10.1007/s00216-007-1714-0

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  • DOI: https://doi.org/10.1007/s00216-007-1714-0

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