在通过CRISPR/Cas9恢复读取时,DYSF基因中出现了意想不到的额外外外突变
Olga Levchenko1, Irina Panchuk1, Konstantin Kochergin-Nikitsky1
1Research Centre for Medical Genetics, 115522, Moscow, Russia.
Bio Systems
|November 9, 2023
概括
克里斯普尔/卡斯基因编辑成功地跳过了DYSF基因中的特定外因子,有可能治疗肌肉病. 意想不到的是,跳过26-27号外子也导致了30号外子在转录中缺席,突出了更广泛的基因调节效应.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 编码dysferlin蛋白的DYSF基因很大,有许多转录.
- DYSF中的致病变体导致各种肌肉病变,使其成为基因编辑研究的目标.
- CRISPR/Cas基因组编辑为遗传疾病提供了一个潜在的治疗策略.
研究的目的:
- 通过使用CRISPR/Cas.评估DYSF基因中永久性外显子跳转的可行性.
- 调查跳过34和26-27的突变,以消除没有框架转移突变的截断变体.
- 分析针对性DNA修改对DYSF基因转录的影响.
主要方法:
- 使用双 sgRNA 和 sa/spCas9 质粒进行同时转染的 CRISPR/Cas9 系统.
- 通过破坏拼接受体部位,向删除3~4号外显子.
- 通过切除侧面的外显子来针对性地删除26-27外显子.
- 在HEK293T细胞培养和健康的供体肌肉细胞上进行的实验.
主要成果:
- 在DYSF基因转录中成功实现了对外基因3-4和26-27的永久跳转.
- 观察到异构30的意想不到的共删除,当异构26-27被准跳过时.
- 证明了靠近拼接部位的DNA修饰可以影响相邻的外子和整体基因表达.
结论:
- 克里斯普尔/Cas介导的外因子跳转是针对DYSF基因缺陷的可行策略.
- 这项研究揭示了基因组编辑对基因剪接的复杂调节效应,包括意外的外因子去除.
- 需要进一步的研究,以充分理解在DYSF中观察到的目标外拼接事件背后的机制.
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