工程领域嵌入的Nme2Cas9腺因基编辑器,增加了目标DNA编辑和准范围
Ding Zhao1, Xun Gao1, Jiale Zhou1
1Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Veterinary Medicine, Jilin University, Changchun, 130062, China.
BMC biology
|November 10, 2023
概括
经过工程设计的Nme2Cas9基编辑器显示了改善的腺基编辑效率,特别是在具有挑战性的DNA位置上. 这些增强的工具为基因编辑应用提供了更广泛的编辑窗口和扩展的PAM兼容性.
科学领域:
- 分子生物学分子生物学
- 基因编辑技术的技术
- 生物化学 生物化学
背景情况:
- Nme2ABE8e是一个紧的腺基编辑器,具有N4CC PAM,但在困难的DNA位点效率有限.
- 工程工作的重点是通过在Nme2Cas9基编辑器中重新定位除氨酶域来提高编辑效率.
研究的目的:
- 为了提高Nme2Cas9基础编辑器的编辑效率.
- 扩大准范围,提高对具有挑战性的基因位置的性能.
主要方法:
- 通过改变deaminase域的邻近性来设计嵌入域的Nme2Cas9基编辑器.
- 通过交换PAM相互作用域或引入点突变来修改Nme2ABE8e-797.
- 在哺乳动物细胞 (包括Neuro-2a细胞和小鼠) 中测试了编辑器活性和PAM兼容性.
主要成果:
- 在哺乳动物细胞中,Nme2ABE8e-797显示了显著提高的编辑效率和广泛的编辑窗口 (4-18个基).
- 经过修改的编辑器 (Nme2ABE8e-797Smu和Nme2ABE8e-797-C) 与N4CN PAMs显示出强大的活性.
- 在细胞和动物模型中成功地恢复了与疾病相关的位置.
结论:
- 新的Nme2ABE8e变种提供了增强的目标DNA编辑和扩展的PAM兼容性.
- 这些改进的基准编辑器扩展了有效基因修改工具包.
- 工程编辑对遗传疾病的治疗应用有希望.
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