完全不受PAM限制:与CRISPR/Cas12a进行核酸检测的不对称RPA
Gaihua Cao1,2, Nannan Yang1,2, Yifan Xiong1,2
1Key Laboratory for Biorheological Science and Technology of Ministry of Education, Bioengineering College of Chongqing University, Chongqing 400044, PR China.
ACS sensors
|November 27, 2023
概括
这项研究引入了不对称的RPA (Asy-RPA) 来克服CRISPR/Cas12a.
科学领域:
- 分子生物学分子生物学
- 生物技术是生物技术.
- 核酸检测 核酸检测 核酸检测
背景情况:
- 克里斯普尔/Cas12a系统是强大的基因编辑工具,但通常受到双链DNA (dsDNA) 检测的原体空间邻基因 (PAM) 识别的限制.
- 由于PAM序列限制,现有的Cas12a应用在广泛适用方面面临挑战.
研究的目的:
- 开发一种新的方法,消除了基于CRISPR/Cas12a的核酸检测的PAM限制.
- 提高Cas12a的多功能性和灵敏性,用于检测各种DNA点,包括病原体.
主要方法:
- 开发了不对称的RPA (Asy-RPA) 以有效地放大dDNA并将其转化为单链DNA (ssDNA).
- 利用ssDNA产品来激活Cas12a的*跨*分裂活动以输出信号.
- 应用了Asy-RPA和Cas12a平台来检测块性皮肤病病毒,并区分野生型和突变型的*Mycobacterium tuberculosis*.
主要成果:
- Asy-RPA成功地消除了Cas12a的PAM依赖性,使其在核酸检测中得到更广泛的应用.
- 实现了对块性皮肤病病毒的高度敏感检测,其极限低至1.21 × 101副本·μL-1.
- 经过精确检测的 * Mycobacterium 结核病 * (TB) 菌株,包括野生类型和抗利芬胺类型的区分,混合样本的检测极限为1 fM.
结论:
- 亚西-RPA和CRISPR/Cas12a集成平台为dDNA检测提供了一个多功能解决方案,没有PAM约束.
- 这种方法显著提高了各种病毒和细菌病原体的检测能力,有助于疾病控制和治疗策略.
- 该系统检测突变的能力对于识别耐药菌株,支持个性化医学和公共卫生倡议至关重要.
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