基于RAA-CRISPR/Cas12a的视野检测系统,用于在小牛腹中快速和灵敏地诊断主要病毒病原体
Junzhen Chen1,2, Yu Wang1,2, Rezeguli Aikebaier1,2
1College of Veterinary Medicine, Xinjiang Agricultural University, Ürümqi, Xinjiang, China.
Frontiers in cellular and infection microbiology
|September 15, 2025
概括
一个新的RAA-CRISPR/Cas12a系统迅速检测出具有高灵敏度和特异性的关键小牛腹病毒. 这种可在现场部署的诊断工具有助于早期识别,并减少畜牧业的经济损失.
科学领域:
- 兽医病毒学 兽医病毒学
- 分子诊断学 分子诊断
- 畜牧业的健康 畜牧业的健康
背景情况:
- 小牛腹由于死亡率和生长受损而造成重大经济损失.
- 病毒性病原体,通常伴有 coinfections,是感染性小牛腹的主要原因.
- 目前的诊断方法缓慢,缺乏灵敏度,并且不适用于现场.
研究的目的:
- 为常见的小牛腹病毒开发一个快速,灵敏和现场部署的诊断平台.
- 解决兽医环境中传统诊断技术的局限性.
主要方法:
- 在腹样本中,病毒元基因组测序确定了牛病毒 (BNeV),牛冠状病毒 (BCoV),牛病毒性腹病毒 (BVDV) 和牛肠道病毒 (BEV).
- 在37°C和CRISPR/Cas12a光检测系统中开发了一种综合的复合酶辅助放大 (RAA).
- 该平台使用临床样本进行了验证,将其性能与传统的聚合酶链反应 (PCR) 进行了比较.
主要成果:
- 该RAA-CRISPR/Cas12a系统的灵敏度比PCR高100-100,000倍,检测极限为1-10个副本/μL.
- 临床验证显示检测率比PCR高1.6-4.9倍,具有100%的特异性.
- 测试工作流程为40分钟,只需要便携式热块和蓝色LED变光器在现场使用.
结论:
- 该RAA-CRISPR/Cas12a系统为诊断主要小牛腹病毒提供了实地应用的实验室级准确性.
- 这种快速,灵敏和便携式的诊断方法有助于早期发现病原体,这对于制疫情和减轻牛业经济损失至关重要.
相关概念视频
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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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