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在基因组DNA中编程A•T到G•C的基因编辑,无需DNA裂变
Nicole M Gaudelli1,2,3, Alexis C Komor1,2,3, Holly A Rees1,2,3
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|November 22, 2017
概括
科学家开发了腺基编辑器 (ABE) 来将DNA中的A•T转换为G•C基对. 通过精确的基因编辑,
科学领域:
- 分子生物学
- 遗传学
- 生物技术
背景情况:
- 细胞因子去胺导致C•G转变为T•A,这是人类病原性突变的常见来源.
- 针对性地将AT转化为GC对于研究和治疗遗传疾病至关重要.
- 基因编辑能力受到限制.
研究的目的:
- 在基因组DNA中开发新型腺基编辑器 (ABEs) 以实现有效的A•T到G•C基因对转换.
- 通过定向进化和蛋白质工程设计高特异性和高效的ABE.
- 证明ABE在纠正或抑制人类细胞中致病突变的有用性.
主要方法:
- 一个转移RNA腺胺酶的演化与一种具有催化性损害的CRISPR- Cas9突变物融合.
- 广泛的定向进化和蛋白质工程以优化腺基编辑器功能.
- 评估ABE的效率,产品的纯度,以及人类细胞中的分离率.
主要成果:
- 第七代ABE在人类细胞中将向的AT转化为GC的效率约为50%.
- 在ABE中观察到高纯度 (≥99. 9%) 和低度 (≤0. 1%).
- 与Cas9核酶方法相比,ABE显示出更高的效率和特异性,使得疾病相关突变的安装成为可能.
结论:
- 基编辑器 (ABEs) 提供了一个强大的新工具,用于基因组DNA中精确的A•T到G•C基因编辑.
- 在没有双链DNA裂变的情况下,ABE可促进过渡突变的直接和可编程引入.
- 这项技术提升了基因治疗和遗传疾病研究的潜力.
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