通过无模板的CRISPR-Cas9编辑和基因转换对ATAD3A病原体变异的基因特异性校正
bioRxiv : the preprint server for biology
|November 24, 2025
概括
通过CRISPR-Cas9基因编辑,可以使用无模板基因转换来纠正人类干细胞中的病原性突变. 这种同源重组途径有效地修复引起疾病的变异,为基因疗法提供了潜在的潜力.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 基因编辑 基因编辑
背景情况:
- 基因转换是一个关键的同源重组 (HR) 过程.
- 克里斯普尔-Cas9技术可以诱导双链断裂 (DSB) 来触发基因转换.
- 了解线粒基因转化对于治疗应用至关重要.
研究的目的:
- 为了研究无模板的CRISPR-Cas9介导基因转换以纠正致病变体.
- 确定线粒基因转换的效率,转化通道长度和蛋白质依赖性.
主要方法:
- 在患者衍生的iPSC中,CRISPR-Cas9诱导的DSBs用于纠正异合体的ATAD3A变异体.
- 下一代测序 (NGS) 和纳米孔测序用于分析编辑结果和转换路径.
- 敲除HR蛋白 (RAD51,CtIP,BRCA1/2) 以评估途径的依赖性.
主要成果:
- 通过基因间转换 (>99%) 有效纠正ATAD3A变异 (38%~53%双类野生型).
- 基因转换路径主要为<2千基.
- HR蛋白质RAD51,CtIP和BRCA1/2对于这个过程至关重要.
- 克里斯普尔-Cas9可以导致非目标删除,如在一个克隆中所见.
结论:
- 无模板CRISPR-Cas9介导的基因间转换是一种可行的策略,用于纠正人类iPSC中的致病变体.
- 这个过程依赖于RAD51依赖的同源重组.
- 需要进行进一步的研究,以减轻临床翻译的非目标效应.
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