AtCas9的循环工程用于有效和广泛的基因组编辑
Yue-Lin Zhang1, Dong-Chao Huang1, Min Duan1
1Department of Rheumatology and Immunology, Medical Research Institute, Frontier Science Center for Immunology and Metabolism, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, Hubei, China.
Cell insight
|November 24, 2025
概括
循环工程提高了Cas9在哺乳动物细胞中的基因组编辑效率. 这一策略改善了核酶和基编辑,为基于CRISPR的疗法和扩展基因编辑应用提供了潜力.
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:
- 在哺乳动物细胞中有效的基因组编辑对于开发基于CRISPR的治疗方法至关重要.
- 目前的Cas9增强策略主要侧重于点突变,使循环工程未被充分探索.
研究的目的:
- 研究循环工程作为一种提高Cas9核酶和基编辑效率的方法.
- 为治疗应用开发改进的Cas9变种,并扩大基因组编辑能力.
主要方法:
- 通过将热性AtCas9的工程表面暴露循环替换为 mesophilic Nme1Cas9的对应物,以创建AtCas9-Z7变体.
- 在限制的条件下,利用生物化学测试来评估RNP-DNA相互作用和结合亲和力.
- 采用分子动力学模拟来分析工程 Cas9 变体的结构稳定性.
- 结合循环工程与结构引导的点突变,以进一步增强Cas9活动.
主要成果:
- 该AtCas9-Z7变体显示显著改善了核酶和基编辑效率.
- 在限制的条件下,Z7保持了高的Cas9结合亲和力,克服了哺乳动物细胞中常见的约束.
- Z7-E78-ABE变种显示编辑效率增加了5.76倍,扩展了PAM识别,并使初级人类T细胞的编辑成为可能.
- 将循环移植到GeoCas9和ThermoCas9中,在非正规的PAM中,平均效率分别提高了14.50倍和7.37倍.
结论:
- 循环工程是一种有效和精简的策略,用于提高基因组编辑中的Cas9性能.
- 这种方法可以与其他优化方法相结合,进一步提高Cas9的活动并扩大其实用性.
- 循环工程为基于CRISPR的应用程序提供了一个合理和模块化的Cas9优化策略,具有显著的治疗潜力.
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