具有内部基基修饰的单链DNA通过使用CRISPR-Cas9在原始细胞中调解高效的敲进作用
Karen L Kanke1, Rachael E Rayner2, Jack Bozik1
1Center for Gene Therapy, Abigail Wexner Research Institute, Nationwide Children's Hospital, 700 Children's Drive, Columbus, OH 43215, USA.
Nucleic acids research
|November 21, 2024
概括
化学修饰的单链DNA (ssDNA) 在各种原始细胞中显著提高了基因组敲进效率. 这种优化的ssDNA方法显示了对遗传疾病的治疗潜力.
科学领域:
- 分子生物学分子生物学
- 基因编辑 基因编辑
- 基因组学就是基因组学.
背景情况:
- 单链DNA (ssDNA) 和Cas9用于基因组敲进,但效率通常很低.
- 对ssDNA的化学修改可能会改善基因编辑结果.
研究的目的:
- 为了研究内部化学修饰的ssDNA (esDNA) 提高基因组敲进效率的有效性.
- 在各种细胞类型中比较esDNA性能与终端修饰的ssDNA.
主要方法:
- 开发和应用增强的ssDNA (esDNA) 具有12-19%的内部基因化学修饰.
- 在气道基底干细胞 (ABC),CD34+造血细胞,T细胞和内皮细胞中测试esDNA的敲进 (KI) 效率.
- 研究TREX1核酶在esDNA介导KI中的作用,包括淘汰赛实验.
主要成果:
- 与终端修改的ssDNA相比,esDNA在多种主要细胞类型中提高了KI效率的2-3倍.
- 在ABC中在临床相关的位置 (CFTR,HBB,CCR5) 达到50%以上的等位基因KI.
- 在具有DNA-PKcs抑制剂的CD34+细胞中,在HBB位点中证明高达70%的等位基因KI.
- 在诱导多能干细胞 (iPSC) 中,esDNA没有改善KI,可能是由于TREX1缺失.
- 在其他细胞类型中,TREX1淘汰增强KI与未经修改的ssDNA.
结论:
- 内部修饰的ssDNA (esDNA) 代表了增强原始细胞基因组敲进的重大进步.
- 这种方法提供了治疗相关的校正水平,与基于AAV的方法相美.
- 这些发现表明,TREX1在ssDNA介导的基因编辑中起着至关重要的作用,为进一步优化打开了道路.
- esDNA适用于修改初级细胞中的小基因组区域 (20-30bp),用于治疗和研究应用.
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