基于免扩增高通量测序的转基因定量检测方法研究

Transgenic Quantitative Detection Method Based on PCR-free High-throughput Sequencing Technology

转基因定量检测在食品安全监管和消费者知情权保障中扮演着重要角色。当前,数字PCR方法被广泛认可为核酸精准定量的黄金标准,但缺乏与之相互验证的新型核酸定量技术,这在一定程度上限制了其应用。然而,近年来高通量测序技术的兴起为解决这一难题提供了新的可能性。尽管高通量测序技术主要用于核酸定性序列测定,但其在核酸定量领域的应用潜力尚未充分挖掘。以含有转基因T-NOS、P-35S、CP4-EPSPS和大豆内标准基因Lectin的质粒DNA标准物质为检测对象,采用免扩增建库的方法,比较了NGS、三代测序以及数字PCR定值的差异。结果表明,NGS测序结果与数字PCR结果存在显著性差异,这一发现突显了目前核酸定量技术中的挑战和需求。然而,值得注意的是,三代测序结果与数字PCR检测结果一致性良好,显示了其作为转基因核酸精准定量方法的潜力。这一发现为未来转基因产品标识阈值的制定提供了技术上的支撑和参考,为食品安全监管提供了新的技术途径。

Quantitative GMO detection is essential for ensuring food safety and protecting consumer rights to information.Although digital PCR is currently considered the gold standard for accurate nucleic acid quantification,the lack of validated new quantification technologies limits its applications.However,the emergence of high-throughput sequencing has opened up new possibilities for solving this challenge.While high-throughput sequencing is primarily used for qualitative nucleic acid sequence determination,its potential for quantitative analysis has yet to be fully explored.In this study,plasmid DNA standard materials containing transgenic T-NOS,P-35S,CP4-EPSPS,and soybean housekeeping gene Lectin were used as the detection objects.The method of library construction without amplification was adopted to compare the differences between NGS,third-generation sequencing,and digital PCR quantification.The results showed significant differences between NGS sequencing results and digital PCR results,highlighting the challenges and demands in current nucleic acid quantitative analysis technologies.However,it is worth noting that the results of third-generation sequencing were consistent with the digital PCR detection results,demonstrating its potential as a precise method for quantifying transgenic nucleic acids.