工程三方基因编辑机器,用于高效的非病毒向基因组集成
Hangu Nam1, Keqiang Xie2, Ishita Majumdar2
1Department of Bioengineering, Northeastern University, Boston, MA 02115, United States.
Research square
|November 14, 2023
概括
研究人员开发了enGager,这是一种新的基因组编辑系统,可以提高基因敲定效率,使用圆形单链DNA (cssDNA) 捐赠者. 该系统改善了向基因整合,为治疗应用提供了比病毒载体更安全的替代方案.
科学领域:
- 分子生物学分子生物学
- 基因编辑 基因编辑
- 生物技术是生物技术.
背景情况:
- 非病毒性DNA供体模板对于通过同源重组 (HR) 进行向基因组集成至关重要.
- 克里斯普尔/Cas9系统提高了HR介导基因编辑的效率.
- 循环单链DNA (cssDNA) 已被证明是一个基因组工程催化剂 (GATALYST),用于安全和高效的基因敲进.
研究的目的:
- 开发一个增强的基因组编辑器,enGager,提高cssDNA捐赠者的集成效率.
- 评估enGager在不同细胞系和基因组位点的基因组集成和转基因表达中的性能.
- 评估enGager在治疗基因改造方面的潜力,特别是用于CAR-T细胞工程.
主要方法:
- 开发enGager,一个系统将cssDNA捐赠者与核局部化的Cas9与ssDNA结合合在一起.
- 在多个细胞系和基因位置测试enGager的整合效率和敲进基因 (例如GFP) 的表达.
- 在初级人类T细胞中应用enGager,以向整合仿真抗原受体 (CAR) 转基因.
主要成果:
- 与未融合的Cas9编辑器相比,enGager显著提高了定位基因组集成效率,从1.5倍到6倍以上.
- 在初级细胞中,较大的转基因 (> 4Kb) 的增强最为明显,而非合并的ssDNA捐赠者更受青.
- 在33%的初级人类T细胞中实现了CAR转基因的有效向整合,显示出功能性抗瘤活性.
结论:
- 该enGager系统大大提高了使用cssDNA捐赠者的向基因整合的效率和安全性.
- enGager克服了病毒载体在有效载荷大小和治疗基因编辑应用的安全性方面的局限性.
- "使用ssDNA优化基因组工程的三方编辑器" (TESOGENASETM) 系统在推进治疗基因改造方面具有重大潜力.
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