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一个简单,快速和无污染的超敏感的视觉诊断平台,基于RPA与CRISPR/Cas12a结合

Yan Liu¹, Yu Xie¹, Zhangli Wang¹

¹Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China.

Foods (Basel, Switzerland)

|September 13, 2025

概括

使用管管尖入管 (PTIT) 策略的新一CRISPR/Cas12a方法快速检测食物传播病原体Cronobacter sakazakii. 这种方法可以防止气溶污染,并简化分子诊断,以进行潜在的临床检测.

科学领域:

分子诊断学分子诊断
检测食物传播病原体的检测
在CRISPR/Cas系统中.

背景情况:

克里斯普尔/卡斯系统在分子诊断方面取得了重大进展.
核酸检测的常用两步方法在气溶污染方面面临挑战.
一式方法旨在简化检测,但通常需要专门的设备或修改.

研究的目的:

开发一种新的一战略,用于检测食源病原体Cronobacter sakazakii (C. sakazakii).
使用CRISPR/Cas12a和重组酶聚合酶放大 (RPA) 建立C. sakazakii的快速检测平台.
解决RPA-CRISPR/Cas12a方法中的气溶污染问题,并制定简化,敏感的检测策略.

主要方法:

来自C. sakazakii病毒性基因 ompA的特定序列被确定为检测目标.
一个CRISPR/Cas12a系统与RPA相结合,创建了一个快速检测平台.
开发了一种新型的管管尖入管 (PTIT) 方法来隔离RPA和CRISPR/Cas组件,以防止单形式的气溶污染.

主要成果:

开发的方法显示出高灵敏度,基因组DNA的检测极限为10−4 ng/μL,目标DNA的检测极限为1.43副本/μL,纯细菌培养的检测极限为6 CFU/mL.
人工污染的奶粉样本的检测极限低至4.65CFU/mL (牛奶) 和4.35CFU/mL (山羊奶) 没有缩.
PTIT方法的灵敏度与两步方法相同,但完全消除了由于气溶污染而导致的错误阳性,而不需要特殊设备或化学修改.

结论:

一种新的一CRISPR/Cas12a检测策略,PTIT方法,已成功开发,用于敏感和快速检测C. sakazakii.
PTIT方法有效地克服了传统方法固有的气溶污染问题,提供了一种简单而强大的解决方案.
由于其易于使用和高灵敏度,这种方法对临床快速检测 (POCT) 应用具有重大潜力.

关键词:

这就是CRISPR/Cas12a.克罗诺巴克特 (Cronobacter sakazakii) 已经被发现一式方法的一式方法快速检测快速检测迅速检测复合酶聚合酶放大复合酶.

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