细胞酶基编辑器在小鼠胚胎中产生了大量的非目标单核酸变体
Erwei Zuo1,2, Yidi Sun3, Wu Wei4,5,6
1Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Research Center for Brain Science and Brain-Inspired Intelligence, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
概括
基因组编辑可以修复基因突变, 一种名为GOTI的新方法显示,CRISPR-Cas9和腺基编辑器具有较低的非目标突变,与细胞基编辑器不同.
科学领域:
- 遗传学
- 分子生物学
- 生物工程
背景情况:
- 像CRISPR-Cas9这样的基因组编辑技术通过纠正致病突变来治疗遗传疾病.
- 准确评估非目标突变对于基因组编辑应用的安全性和有效性至关重要.
- 单个基因变异,如单核酸多态 (SNP),使真正的目标外编辑事件的识别复杂化.
研究的目的:
- 开发和验证一种敏感的方法来检测由基因组编辑工具诱导的全基因组非目标突变.
- 在体内比较不同基数编辑器和CRISPR-Cas9的真实性.
- 在早期小鼠胚胎中建立非目标突变率的基准.
主要方法:
- 通过双细胞胚胎注射 (GOTI) 方法进行全基因组非目标分析.
- 使用CRISPR-Cas9或腺基编辑器 (ABAE) 或细胞基编辑器 (CBE) 在双细胞阶段的小鼠胚胎中编辑一个芽细胞体.
- 在胚胎第14.5天从编辑和未编辑的母细胞中对后代细胞进行全基因组测序,以确定异于目标单核酸变体 (SNV).
主要成果:
- 在全基因组中成功检测出非目标突变.
- CRISPR-Cas9和ABAE编辑导致罕见的非目标SNV,其频率与自发突变率相当.
- 细胞因子基编辑器 (CBEs) 诱导的SNV频率超过自发率的20倍,表明忠实度较低.
结论:
- GOTI是评估全基因组非目标突变的有效方法.
- 在早期胚胎中,CRISPR-Cas9和ABAE对体内基因组编辑具有高特异性.
- 细胞基编辑器需要进一步优化以提高其忠实性并减少无意的非目标突变.
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