通过DNA酶触发的平衡转移与自主激活的CRISPR-Cas12a生物传感器使核酸的单一诊断成为可能
Di Huang1,2, Yichen He1,2, Chutian Xu3
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310030, China.
Analytical chemistry
|January 31, 2025
概括
一种新的DNA酶触发的平衡转移与自主激活的CRISPR-Cas12a生物传感器 (DESCRIBER) 增强了核酸检测. 这个集成系统在一小时内实现了高度敏感的HIV-1基因组检测.
科学领域:
- 生物技术是生物技术.
- 分子诊断学 分子诊断
- 这就是CRISPR技术.
背景情况:
- 目前的核酸检测方法集成复合酶-聚合酶放大 (RPA) 和CRISPR-Cas12a,面临效率和复杂性的挑战.
- 现有的策略可能会受到RPA和Cas12a之间的干扰的影响,这可能会降低整体诊断性能.
研究的目的:
- 开发一个改进的综合核酸检测平台,结合RPA和CRISPR-Cas12a.
- 通过一种新的机制,通过最小化干扰和最大化酶活性来克服当前方法的局限性.
主要方法:
- 开发一种DNA酶触发的平衡转移与自主激活的CRISPR-Cas12a生物传感器 (DESCRIBER).
- 使用圆形crRNA (C-crRNA) 在RPA期间初步静止Cas12a,通过DNA酶生成激活Cas12a.
- 实现了一个自我激活机制,激活的Cas12a进一步线性化C-crRNA以加速信号读取.
主要成果:
- 在1小时内实现了高灵敏度的HIV-1基因组检测,降低到500副本/毫升.
- 在检测常见的HIV-1亚型和针对其他病原体的特异性方面表现出普遍性.
- 与qRT-PCR相比,在检测尖端样本方面表现出很好的准确性.
结论:
- DESCRIBER平台为集成核酸检测提供了一种简化和高效的方法.
- 这一战略增强了CRISPR-Cas12a系统,为更广泛的临床诊断应用铺平了道路.
- 提出的方法有望提高基于CRISPR的诊断的实用性.
相关概念视频
01:59CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
02:53CRISPR and crRNAs
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...
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...
01:59CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
01:28CRISPR/Cas9 Genome Editing
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...