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文章分享丨基于AI增强CRISPR-Cas14a的微流控检测平台,实现番茄双生病毒快速精准检测

文章分享丨基于AI增强CRISPR-Cas14a的微流控检测平台,实现番茄双生病毒快速精准检测

文章标题:MaC14a: An AI-enhanced CRISPR-Cas14a microfluidic platform for accurate on-site detection of geminiviruses in tomato plants and whiteflies

发表单位:中国计量大学生命科学院

发表期刊:Chemical Engineering Journal

影响因子:13.3

DOI: 10.1016/j.cej.2025.165904

(点击底部"阅读原文",查看文章)

实验背景

双生病毒科经烟粉虱传播,严重威胁全球番茄生产,传统检测多针对显症植株,病毒已达传播水平,防控失效。现有PCR、ELISA等方法存在设备依赖、灵敏度不足、非特异性扩增、酶系统不兼容等缺陷,难以实现无症状感染与单只媒介昆虫的早期检测。

MIRA技术突破了传统PCR对专业实验室和精密设备的限制,除了本文的植物病毒检测,还能与CRISPR、微流控、胶体金试纸、荧光等技术协同,在农业疫病检测、医学诊断、动物检疫、食品安全、海关检疫等领域展现出极高的应用价值和产业化前景。

实验方案设计

(图1. MaC14a系统用于多重双生病毒监测的整合工作流程)

1中,MaC14a平台用于双生病毒多重监测的整合工作流程,共分A、B、C三个子图,从检测原理、微流控现场检测流程、AI信号解析逻辑三个核心维度,完整展示了该平台 “核酸提取 - 扩增检测 - 信号判读”的一体化运作模式

多酶恒温快速核酸扩增技术MIRA本身具备等温、快速、简便、适配现场的固有优势,通过研究团队的优化aMIRA后,完美解决了与CRISPR-Cas14a 的兼容性问题,同时与微流控、AI算法协同,最终成为MaC14a平台实现超灵敏、快速、精准、现场可操作双生病毒检测的核心技术支撑。

  • CRISPR系统优化

(图2. CRISPR/Cas14a系统的优化)

通过CRISPR/Cas14a系统sgRNA筛选、反应温度、反应时间、Cas蛋白浓度等优化,完成CRISPR-Cas14a系统优化:筛选出四种靶病毒的最优sgRNA,确定300 nM Cas14a、600 nM sgRNA、1.5×HOLMES缓冲液+ RNase抑制剂的最优反应体系,37~46℃均有热稳定性;然而检测实际样本时,由于检测灵敏度较低,未按测出结果。因此加入MIRA技术实现对微量病毒核酸的信号放大。

  • aMIRA-Cas14a检测系统

(图3. aMIRA-Cas14a检测系统)

为实现对微量病毒核酸的信号放大,为Cas14a提供充足底物,基MIRA 发展出aMIRA(非对称多酶恒温快速核酸扩增),与Cas14a结合生成aMIRA-Cas14a系统,具体优势如下:

1.优化引物化学计量比,MIRA可定向过量生成ssDNA,适配Cas14a的底物需求通过将正/反向引物比例优化至20:1直接为 Cas14a(仅特异性识别切割 ssDNA)提供充足底物

2.MIRA与CRISPR-Cas14a实现单管 “一锅法” 整合,消除污染风险

3.MIRA提升检测灵敏度,实现超微量病毒核酸检测

4.aMIRA-Cas14a保持高特异性,避免非特异性扩增假阳性。

最终将MIRA与CRISPR-Cas14a实现单管“一锅法”整合,消除污染风险让MIRA的优势与CRISPR-Cas14a系统完美协同,解决了等温扩增与CRISPR 系统不兼容的行业痛点,成为MaC14a平台的核心技术突破,aMIRA-Cas14a的灵敏度提高1000倍且实现特异性扩增,与Cas14a的序列特异性识别结合,实现双重特异性验证,对非靶病毒和健康样本无交叉反应,解决了易出现假阳性的行业痛点。

实验中的MIRA多酶恒温快速核酸扩增试剂由安普未来(常州)生物科技有限公司提供。安普未来生物除了试剂性能优异以外,还配备专业、快速响应的技术支持团队。

  • aMIRA-Cas14a检测平台

(图4. 便携式分析仪和芯片架构)

MIRA具有与研究开发的离心微流控芯片高度适配优势:

1.反应体系小型化,适配微流控芯片的微体积腔室的反应特性;

2.支持多路复用检测,一次可检测多个靶标 / 样本;

3.与便携式设备兼容,实现全流程现场操作。

最终开发出集成微流控芯片和分析仪系统(即MaC14a检测平台):PMMA 材质芯片经精密注塑制成,直径40mm,含3个样本腔、24个检测腔(每样本可检测8个靶标,4个双生病毒各占2腔),预载冻干试剂;便携式分析仪尺寸 230×210×140mm,集成离心、控温、荧光检测、安卓交互和无线传数功能,实现“样本进 - 结果出”的现场操作。该系统旨在实现自动化和简化现场多重检测,同时保持高灵敏度和特异性。

  • 样本验证

(图5. MaC14a的性能评估)

(图6. 人工智能增强型MaC14a系统在双生病毒检测中的评估)

MaC14a作为整合MIRA、CRISPR-Cas14a、离心微流控、AI 算法的一体化检测平台,通过实验室性能验证和现场双盲试验多维度验证,实现了对番茄及烟粉虱中四种双生病毒(TYLCCNV、TYLCV、ToLCNDV、TbCSV)检测的超灵敏、高特异、高稳定、快速精准,且完全适配现场便携操作,检测性能qPCR 高度一致,核心验证结果如下:

特异性:7种植物病毒(4种靶标+3种非靶标:NCTV、TGMV、ToLCV)检测无任何交叉反应,非靶病毒样本荧光信号与阴性对照无差异;

灵敏度:对四种靶病毒合成ssDNA的最低检测限达10fM,结aMIRA扩增后,较无扩增的Cas14a系统(1 pM)灵敏度提升1000 倍;

超早期与介体检测:成功检测到接种后14天无症状番茄植株的病毒感染,还能精准识别单个带毒烟粉虱,实现病毒传播前的介体监测;

田间验证:对杭州、南宁4个温室的20份番茄叶片和20头烟粉虱进行双盲测试,检测结果与荧光定量PCR100%一致,从核酸提取到结果读取全程仅10分钟。

核心优势与突破

实现植株感染症状前检测和单个烟粉虱带毒量精准判定,从源头上阻断病毒传播链,推动植物病害防控从“被动应对”向“主动预警”转变。

解决了等温扩增与CRISPR系统的兼容性问题,单管反应消除污染,微流控 +便携设备适配现场检测,兼顾实验室级灵敏度与田间实用性;

AI 算法大幅缩短检测时间,实现多靶点、多重样本的高通量检测,检测效率较传统方法提升12倍。

具体优势如下:

1.核酸释放剂的核心价值在于将传统复杂、耗时的核酸提取流程简化为“5分钟、一步式、免纯化”的简易操作,同时保证了核酸产物的有效性和与平台反应体系的兼容性,是MaC14a平台能够实现现场化、快速化、自动化检测的重要前提,与aMIRA-Cas14a扩增检测体系、微流控芯片、AI信号解析共同构成了平台的完整技术链条。

2.团队通过将MIRA优化引物化学计量比(最终确定20:1)为aMIRA后,aMIRA 的产物可直接作为Cas14a的底物,激活其反式切割活性以降解荧光探针,实现扩增与检测的无缝衔接。同时MIRA对微量病毒核酸的信号放大,为Cas14a提供充足底物,提高检测灵敏度。

3.Cas14a实现了aMIRA与Cas14a的单管“一锅法”整合,无需空间分隔、相分离或光控等复杂调控手段,既消除了多步操作的交叉污染风险,又进一步简化了检测流程。

4.微流控平台:涵盖了样本加载、 流体控制、 核酸提取、等温扩增 (aMIRA) 、 CRISPR检测 (Cas14a)、荧光读取的完整闭环。用户仅需将处理好的样本加入芯片孔位,放入便携分析仪中即可启动,无需在不同仪器间转移样本或试剂,从根本上消除了交叉污染的风险。

未来研究将拓展检测的病毒谱、优化芯片适配水果/土壤等多样本基质、开发田间即用型试剂试剂盒,该技术为资源受限地区的精准诊断提供方案,有利于提升全球粮食安全水平。

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  1. CONNECT:[ UseTime:0.000512s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 591791 LIMIT 1 [ RunTime:0.002393s ]
  9. UPDATE `article` SET `lasttime` = 1778313991 WHERE `id` = 591791 [ RunTime:0.008195s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000294s ]
  11. SELECT * FROM `article` WHERE `id` < 591791 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000444s ]
  12. SELECT * FROM `article` WHERE `id` > 591791 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000385s ]
  13. SELECT * FROM `article` WHERE `id` < 591791 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001939s ]
  14. SELECT * FROM `article` WHERE `id` < 591791 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000802s ]
  15. SELECT * FROM `article` WHERE `id` < 591791 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003985s ]
0.134430s