模板跳跃主要编辑允许大插入和exon重写 in vivo
Chunwei Zheng1, Bin Liu1, Xiaolong Dong1
1RNA Therapeutics Institute, University of Massachusetts Chan Medical School, Worcester, MA, 01605, USA.
Nature communications
|June 8, 2023
概括
模板跳转初始编辑 (TJ-PE) 允许精确插入高达500bp的大型DNA片段. 这种新型的基因组工程工具成功地在体内重写外因子以逆转疾病表型,为基因治疗提供了一种新方法.
科学领域:
- 分子生物学分子生物学
- 基因组工程是基因组工程.
- 基因治疗 基因治疗
背景情况:
- 针对性地插入大型DNA片段对于基因组工程和基因疗法至关重要.
- 主编辑 (PE) 可以插入短序列,但大型插入 (>400 bp) 仍然低效,缺乏体内演示.
- 逆转移子插入机制激发了新的基因组编辑策略.
研究的目的:
- 开发一种新的原始编辑方法,以高效地插入大型DNA片段.
- 为了证明这种新的基因组编辑技术的体内应用.
- 探索这种方法在治疗性基因重写方面的潜力.
主要方法:
- 开发一个模板跳转 (TJ) 首次编辑指导RNA (pegRNA) 具有两个首次结合点.
- 通过模板跳跃使用单个pegRNA进行大型DNA片段插入.
- 在体外转录的分裂圆形TJ-pegRNA用于非病毒传递.
- 在活体中应用,在小鼠模型中的铁血症I.
主要成果:
- TJ-PE精确地插入了200bp和500bp的碎片,具有高效率 (高达50.5%和11.4%).
- 在细胞中成功插入并表达了~800bp的GFP基因.
- 在体内证明治疗效果,通过重写Tyrosinemia I小鼠肝脏中的外因子,逆转疾病表型.
- 在没有诱导双链DNA断裂的情况下实现了大规模的DNA插入.
结论:
- 模板跳转初始编辑 (TJ-PE) 能够高效精确地插入大型DNA片段.
- TJ-PE为体内基因工程提供了一种有前途的非病毒,双链无断方法.
- 这项技术具有治疗应用的巨大潜力,包括在体内重写突变热点.
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