一个工程化超紧的CRISPR-Cas12f系统,增强了基因编辑活动
Tong Wu1,2, Chang Liu1, Siyuan Zou1,2
1Department of Chemistry, The University of Chicago, Chicago, IL, USA.
Nature chemical biology
|July 3, 2023
概括
研究人员设计了一个更小,更强大的CRISPR-Cas酶,enAsCas12f,用于精确的基因编辑. 这种增强的系统为遗传疾病治疗提供了改进的DNA裂变活性和最小的非目标效应.
科学领域:
- 分子生物学分子生物学
- 生物技术是生物技术.
- 遗传学 是一个遗传学.
背景情况:
- 克里斯普尔-卡斯系统是基因编辑的强大工具.
- 紧的CRISPR-Cas系统对于治疗应用是可取的.
- 现有的系统通常在编辑活动和大小方面存在局限性.
研究的目的:
- 为了设计一种更强大,更紧的CRISPR-Cas酶.
- 评估工程系统的基因编辑效率和特异性.
- 阐明酶活动的结构基础.
主要方法:
- 蛋白质工程的AsCas12f,以创建一个enAsCas12f.
- 在体外DNA裂变测试.
- 在人类细胞中进行基因编辑实验.
- 电子显微镜 (cryo-EM) 结构分析.
- 单导向RNA (sgRNA) 的工程.
主要成果:
- 工程设计的enAsCas12f比野生类型的AsCas12f.高出11.3倍的功效.
- enAsCas12f在人体细胞中具有广泛的功能,可实现高达69.8%的插入和删除.
- 观察到高目标活动与最小的目标外编辑.
- 低温EM结构显示了二分化介导的基质识别.
- 改造的sgRNA-v2较短,具有可比活动.
结论:
- 设计的超紧的AsCas12f系统使得基因编辑功能强大且可靠.
- enAsCas12f为遗传疾病治疗提供了一个有前途的工具.
- 结构洞察力指导进一步优化CRISPR-Cas系统.
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