一种基于重组酶聚合酶放大和CRISPR/AsCas12a的快速现场诊断方法,用于子帕沃病毒病
Yimeng Xiao1, Jingjing Yang2, Wen Yang1
1Jiangsu Key Laboratory of Sericultural and Animal Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Sericultural Scientific Research Center, Chinese Academy of Agricultural Sciences, Zhenjiang, 212100, China.
一个新的CRISPR/Cas12a诊断系统可以快速检测子帕维病毒 (GPV),这是一种对水禽的致命威胁. 这项技术为早期疾病监测和禽畜养殖中疫情制提供了更好的灵敏度和特异性.
科学领域:
- 兽医病毒学 兽医病毒学
- 分子诊断学 分子诊断学
- 生物技术是生物技术.
背景情况:
- 子帕维病毒 (GPV) 导致德兹西病,导致水禽养殖的重大经济损失.
- 快速准确的诊断方法对于管理GPV疫情和确保家禽健康至关重要.
研究的目的:
- 开发和优化一个集群定期间隔的短palindromic重复 (CRISPR) /Acidaminococcus sp. 基于CRISPR关联核酶12a (AsCas12a) 的检测系统用于子帕沃病毒 (GPV).
- 评估开发的CRISPR/Cas12a诊断系统的灵敏度,特异性和临床适用性.
主要方法:
- 优化CRISPR/Cas12a反应条件,包括AsCas12a,crRNA和单链DNA (ssDNA) 的度,用于基于光和侧流测定 (LFA).
- 确定两个测试格式的最小检测极限.
- 通过对一组常见的水禽病原体进行测试来评估特异性.
- 对量化聚合酶连锁反应 (qPCR) 对LFA结果的验证.
主要成果:
- 为CRISPR/Cas12a光测定 (20nM AsCas12a,5nM crRNA,5nM ssDNA) 和LFA (20nM AsCas12a,4nM crRNA) 建立了最佳条件.
- 光试验和LFA分别达到7.8副本/μL和78副本/μL的检测极限,比传统PCR改进1000倍和100倍.
- 试验显示高特异性,没有观察到对其他水禽病毒的交叉反应.
- LFA结果与qPCR完全一致,证实了其诊断可靠性.
结论:
- 一个使用CRISPR/Cas12a技术的双读量GPV检测系统已经成功开发出来.
- 该系统为GPV监测提供了一个敏感,特定和快速的诊断工具.
- 开发的技术对早期检测和控制水鸟群中的GPV爆发具有显著的前景.
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