一个基因编辑站点和模型生物编辑站点的遗传变异目录
Weilong Yang1,2, Jian-Kang Zhu3, Wenfei Jin4
1Institute of Advanced Biotechnology and School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China. yangweilong@whu.edu.cn.
BMC genomics
|November 29, 2024
概括
克里斯普尔-卡斯基因组编辑精确,但常见的遗传变异可能会干扰目标部位的识别. 这项研究绘制了十种模型生物的编辑部位的地图,揭示了CRISPR应用的变异风险.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 在基因组编辑中,CRISPR-Cas系统依赖于原体空间相邻基因 (PAMs) 来进行DNA裂变.
- 常见的遗传变异可以阻碍Cas蛋白对目标部位的识别.
- 关于编辑部位分布和与模型生物中的PAM部位重叠的数据有限.
研究的目的:
- 在十种不同的模型生物体中对六种Cas蛋白质进行基因组编辑站点的特征.
- 评估关键基因组区域内潜在的CRISPR-Cas编辑站点的频率和分布.
- 评估常见遗传变异对CRISPR-Cas目标部位识别的影响.
主要方法:
- 在10个模型生物体中对Cas9,Cas12a,Cas12b,Cas12i,Cas12j和Cas12l的基因组编辑部位进行系统分析.
- 量化基因组中的每千基基数编辑部位密度.
- 整合人类和大米的公开可用的基因组多样性数据 (SNPs和InDels).
- 使用CCR5和BCL11A的案例研究来说明变异位点对sgRNA设计的影响.
主要成果:
- 在研究的基因组中,平均每千基基数发现了超过34个编辑站点.
- 很高的基因百分比 (91.69-99.83%在外基因中,95.4-99.73%在促进体中) 拥有至少一个独特的编辑部位.
- 发现遗传变异 (SNP和InDels) 与人类和大米的编辑部位重叠,对CRISPR/Cas技术的应用构成风险.
- 变异部位被证实是设计有效的单导向RNA (sgRNA) 的关键因素.
结论:
- 这项研究揭示了10个模型生物基因组中6个Cas蛋白的编辑部位的分布模式.
- 这些发现突出了基因变异对CRISPR-Cas目标部位识别的显著不良影响.
- 这项研究是对与CRISPR技术应用相关的潜在风险的重要提醒.
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