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Lab Chip | 从DNA模板到纯化mRNA:全自动微流控系统实现合成-纯化一体化全流程

Lab Chip | 从DNA模板到纯化mRNA:全自动微流控系统实现合成-纯化一体化全流程

期刊:Lab on a Chip (IF=5.4)

发表日期:2026年4月6日

DOI: 10.1039/d6lc00118a

信使RNA(mRNA)技术在疫苗和癌症免疫治疗等领域展现出巨大潜力,但传统mRNA生产过程仍依赖分批式体外转录(IVT)和多个独立的下游纯化步骤,存在混合不均、热量传递差、产物抑制、操作繁琐、耗时长、产品损失及污染风险高等问题。因此,亟需一种能够将高效转录、在线模板去除、自动化纯化与浓缩整合为一体的紧凑型微流控系统,以提升mRNA生产的产率、纯度与可重复性。

韩国Pohang University of Science and Technology的研究者们开发了一种由计算机集中控制的模块化微流控平台,首次将振荡流体外转录Os(IVT)、DNase I固定化生物催化膜与微切向流过滤集成的消化/澄清模块(μFD)、以及实时pH/电导率反馈引导的自动多模态色谱(MMC)串联为端到端的自动化工作流,在2h内完成mRNA合成至纯化,单次产率约1.28 mg,全长转录本完整性高双链RNA杂质降低83.3%,且对不同模板和修饰核苷酸具有良好适应性,为快速、灵活、可扩展的mRNA制造提供了高效平台。该研究成果以“An automated modular microfluidic platform for end-to-end mRNA synthesis and purification”为题,发表在《Lab on a Chip》期刊上。

研究创新点

🔵首次将Os(IVT)、μFD、传感器引导的MMC和切向流浓缩集成为准连续、闭环的自动化工作流,总处理时间从6h缩短至2h,消除手动转移与批次间差异。

🔵将DNase I共价固定于聚多巴胺修饰的PES膜上,并与微切向流过滤结合,在<5min内同时完成DNA模板降解、碎片去除和缓冲液置换,膜可重复使用5次以上,避免了游离酶残留和额外孵育步骤。

🔵采用Python脚本协调泵阀,基于实时pH和电导率反馈实现柱平衡、上样、洗涤、洗脱的条件步进切换(而非固定计时器),使MMC回收率达93.3%,并显著缩短循环时间,提高纯化重现性。

研究图文解析

图1展示了集成化微流控平台的总体架构与Os(IVT)模块的工作原理。整个端到端流程包含Os(IVT)合成、μFD消化/澄清、MMC捕获纯化及HF-TFF浓缩四个单元;Os(IVT)通过将IVT反应液与空气隔片分段组装成塞状流,在毛细管反应器中反复双向振荡并流经蛇形微混合器,实现了高效混合与精准停留时间控制。

图2验证了μFD模块的DNA模板消化性能。将含DNA模板或粗IVT混合物在PES-Pdop-DNase I膜上循环三次,琼脂糖凝胶电泳显示模板DNA被完全降解并去除,而全长mRNA保留在截留液中;该生物催化膜在五次连续运行后仍保持98%的初始消化效率,展示了优异的可重复使用性。

图3展示了下游自动纯化模块。MMC单元在Python控制下利用在线pH和电导率传感器实现上样、洗涤、洗脱的事件驱动切换,优化后mRNA回收率达93.3%;HF-TFF模块用于最终浓缩与缓冲液置换,整个下游流程在自动化条件下完成,减少了人工干预。

图4为集成平台的照片标注,显示了多路阀泵、IVT反应区、光谱仪、μFD单元、MMC柱、缓冲液组、HF-TFF泵等组件的位置,以及模块间通过GMP兼容快接端口实现的硬连接,确保样品流路的封闭和无缝传递。

图5比较了不同工作流程所得mRNA的质量与功能。毛细管电泳和变性凝胶电泳表明,集成[Os(IVT)-μFD-MMC]流程产生单一全长~2 kb条带,而批次流程存在截短副产物;ELISA和点杂交显示集成平台将dsRNA杂质从8-12ng/μg mRNA降至<3ng/μg;HeLa细胞转染实验证明集成平台mRNA的荧光素酶表达量显著高于批次流程,且对修饰核苷酸(M1、M2)同样有效。

图6总结了集成平台的操作时序与生产力。端到端总处理时间约2h,而常规批次需6h;单次产率1275±1.7μg(纯度A260/230=2.26),相对于全批次基准(641μg)提升约2倍;模块化设计支持通过延长运行时间或并行化实现规模放大。

总结与展望

本文成功构建了首个端到端自动化微流控mRNA合成与纯化平台,将振荡流IVT、酶膜消化/澄清及传感器引导的多模态色谱集成为准连续工作流,在2h内获得约1.28 mg高纯度、低dsRNA杂质且翻译活性显著增强的mRNA。

未来可通过通道并行化实现规模放大,结合在线分析工具与人工智能实现自适应过程控制,并将平台拓展至自扩增mRNA、环状RNA等新型RNA模式的快速制造,为个性化疫苗和精准医疗的按需生产提供灵活、紧凑的解决方案。

免责声明:

本文为科普类文章,旨在普及微流控领域相关知识、促进科学传播。

文中所使用的视频、图片、文字等素材,若涉及作品版权问题,请相关权利人及时与我们联系,我们将依法依规妥善处理。

此外,若文章内容存在错误,或与原期刊文章的观点、结论不一致,也欢迎随时告知我们,我们将第一时间进行修改、删除等处理。

同时,热忱欢迎微流控领域科研工作者、科普爱好者向我们投稿、荐稿,或洽谈合作事宜,共同助力微流控学术和产业化发展。

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  1. CONNECT:[ UseTime:0.001128s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001692s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000685s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001353s ]
  6. SELECT * FROM `set` [ RunTime:0.000603s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001527s ]
  8. SELECT * FROM `article` WHERE `id` = 547154 LIMIT 1 [ RunTime:0.001125s ]
  9. UPDATE `article` SET `lasttime` = 1776632333 WHERE `id` = 547154 [ RunTime:0.008092s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002182s ]
  11. SELECT * FROM `article` WHERE `id` < 547154 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000495s ]
  12. SELECT * FROM `article` WHERE `id` > 547154 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 547154 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000666s ]
  14. SELECT * FROM `article` WHERE `id` < 547154 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000958s ]
  15. SELECT * FROM `article` WHERE `id` < 547154 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001336s ]
0.240854s