关联CRISPR-Cas12a目标释放无差别的单链DNase活动
Janice S Chen1, Enbo Ma1, Lucas B Harrington1
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
概括
除了基因组编辑之外,CRISPR-Cas12a酶还具有新的单链DNA (ssDNA) 分裂活性. 这一发现导致了DETECTR的开发,用于高度敏感的DNA检测.
科学领域:
- 分子生物学
- 生物化学
- 遗传学
背景情况:
- CRISPR-Cas12a (Cpf1) 蛋白质是细菌适应性免疫的不可或缺的RNA引导酶.
- 与Cas9相似的Cas12a用于基因组编辑应用中的向DNA裂变.
研究的目的:
- 调查CRISPR-Cas12a的DNA裂变活动超出了目标双链断裂.
- 探索Cas12a的ssDNA裂变活动的潜力,用于新的检测方法.
主要方法:
- 对CRISPR-Cas12a的RNA导向DNA结合和随后的分裂活动的表征.
- 通过将 Cas12a ssDNase 激活与异热放大相结合,开发了针对 DNA 内核酶的 CRISPR 转载记者 (DETECTR) 测定.
- 在临床样本中检测人类乳头瘤病毒 (HPV) 的DETECTR应用.
主要成果:
- 通过 Cas12a 的 RNA 指导的 DNA 结合激活了一个无差别的单链 DNA (ssDNA) 裂变功能,降解 ssDNA 分子.
- 这种目标激活的非特异性ssDNase活性是V型CRISPR- Cas12酶中保留的特性.
- 通过DETECTR方法证明了对DNA检测的敏感性.
- DETECTR能够在患者样本中快速和精确地检测出人类乳头瘤病毒.
结论:
- 在识别目标时,CRISPR-Cas12a表现出以前未知的ssDNA分裂活动.
- 这种ssDNase活动可以用来开发像DETECTR这样的高度敏感的诊断工具.
- DETECTR为分子诊断提供了一个有前途的平台,HPV检测就是一个例子.
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