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Multiplex enrichment quantitative PCR (ME-qPCR): a high-throughput, highly sensitive detection method for GMO identification

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Abstract

Among all of the high-throughput detection methods, PCR-based methodologies are regarded as the most cost-efficient and feasible methodologies compared with the next-generation sequencing or ChIP-based methods. However, the PCR-based methods can only achieve multiplex detection up to 15-plex due to limitations imposed by the multiplex primer interactions. The detection throughput cannot meet the demands of high-throughput detection, such as SNP or gene expression analysis. Therefore, in our study, we have developed a new high-throughput PCR-based detection method, multiplex enrichment quantitative PCR (ME-qPCR), which is a combination of qPCR and nested PCR. The GMO content detection results in our study showed that ME-qPCR could achieve high-throughput detection up to 26-plex. Compared to the original qPCR, the Ct values of ME-qPCR were lower for the same group, which showed that ME-qPCR sensitivity is higher than the original qPCR. The absolute limit of detection for ME-qPCR could achieve levels as low as a single copy of the plant genome. Moreover, the specificity results showed that no cross-amplification occurred for irrelevant GMO events. After evaluation of all of the parameters, a practical evaluation was performed with different foods. The more stable amplification results, compared to qPCR, showed that ME-qPCR was suitable for GMO detection in foods. In conclusion, ME-qPCR achieved sensitive, high-throughput GMO detection in complex substrates, such as crops or food samples. In the future, ME-qPCR-based GMO content identification may positively impact SNP analysis or multiplex gene expression of food or agricultural samples.

For the first-step amplification, four primers (A, B, C, and D) have been added into the reaction volume. In this manner, four kinds of amplicons have been generated. All of these four amplicons could be regarded as the target of second-step PCR. For the second-step amplification, three parallels have been taken for the final evaluation. After the second evaluation, the final amplification curves and melting curves have been achieved

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Acknowledgements

This work was supported by the National Grand Project of Science and Technology (2016ZX08012-001), the Science and Technology Planning Project of Guangdong Province (2014A040401029), and the Science and Technology Planning Project of Guangzhou (2014J4100105).

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Authors and Affiliations

  1. The Institute of Plant Quarantine, Chinese Academy of Inspection and Quarantine, Ronghuananlu No.11, Beijing Economic-Technological Developmental Area, Beijing, 100176, China

    Wei Fu, Pengyu Zhu, Chenguang Wang & Shuifang Zhu

  2. Shantou Entry-Exit Inspection and Quarantine Bureau, Building, No.126, Jinsha Road, Shantou, Guangdong, 515041, China

    Shuang Wei

  3. Guangxi Entry-Exit Inspection and Quarantine Bureau, No.38, Binhu Road, Qingxiu District, Nanning, Guangxi, 530028, China

    Du Zhixin

  4. Department of Food Science and Engineering, Jinan University, Guangzhou, Guangdong, 510632, China

    Xiyang Wu

  5. Institute of Agricultural Standard and Testing Technology, Jilin Academy of Agricultural Sciences, No. 1363 Shengtai St., Changchun, Jilin, 130033, China

    Feiwu Li

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  1. Wei Fu
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Fu, W., Zhu, P., Wei, S. et al. Multiplex enrichment quantitative PCR (ME-qPCR): a high-throughput, highly sensitive detection method for GMO identification. Anal Bioanal Chem 409, 2655–2664 (2017). https://doi.org/10.1007/s00216-017-0209-x

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  • DOI: https://doi.org/10.1007/s00216-017-0209-x

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