设计一种与CRISPR相关的IscB系统,用于在人类细胞和小鼠胚胎中开发微型基因组编辑工具
Fei Zhang1,2, Yuxin Peng3,4, Dongdong Fan3
1State Key Laboratory of Epigenetic Regulation and Intervention, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China. zhangfei171@mails.ucas.ac.cn.
Nature communications
|November 27, 2025
概括
研究人员从IscB开发了增强的微型CRISPR-Cas9基因组编辑工具 (enDelIscB),使其能够有效地进行体内传递和基础编辑,用于各种应用.
科学领域:
- 分子生物学分子生物学
- 基因编辑技术的技术
- 生物技术是生物技术.
背景情况:
- IscB蛋白质是紧的CRISPR相关酶,是Cas9在体内传递的潜在替代品.
- 像OgeuIscB这样的现有IscB系统在真核生物中起作用,但需要特定的目标相邻基因 (TAM).
- 需要更高效和多功能的微型基因组编辑工具.
研究的目的:
- 描述一种与CRISPR相关的新型IscB系统,DelIscB,它可以识别灵活的TAM.
- 为增强活动设计DelIscB,并开发微型基础编辑器.
- 评估工程DelIscB系统的体内适用性.
主要方法:
- 对DelIscB蛋白及其单导向RNA (sgRNA) 的系统工程.
- 工程设计的endDelIscB与T5外核酶 (T5E) 融合以进行DNA裂变.
- 用于基编辑的endDelIscB尼克酶与细胞因子或腺脱氨酶的融合.
- 通过微注射mRNA/sgRNA.RNA来生成小鼠模型.
主要成果:
- 与野生类型相比,工程EnDelIscB的活动增加了48.9倍.
- enDelIscB-T5E在人类细胞中表现出高效的DNA裂变,与enIscB-T5E相当.
- 通过使用enDelIscB nickase.建立了高效的微型基础编辑器 (ICBE和IABE).
- 在使用enDelIscB和enDelIscB-T5EmRNA/sgRNA.sgRNA的小鼠模型中成功生成.
结论:
- 工程DelIscB系统 (enDelIscB) 提供了显著增强的基因组编辑活动.
- 基于DelIscB的工具,包括核酶和基编辑器,是高效的,适合于体内应用.
- 这些微型基因组编辑工具对各种治疗和研究应用具有很大的前景.
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