Casδ是一种进化过渡的CRISPR系统,可以在动物和植物中有效编辑基因组
Zhijia Yang1, Meixia Yu1, Peiyang Li1
1State Key Laboratory of Maize Bio-breeding, Key Laboratory of Genome Editing Research and Application, Ministry of Agriculture and Rural Affairs, National Maize Improvement Center, Frontiers Science Center for Molecular Design Breeding (MOE), College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
Nucleic acids research
|December 22, 2025
概括
一个新的CRISPR-Cas效应器超级家族,Casδ,被发现. 这种紧的系统可以在植物和人类细胞中进行高效的跨王国基因组编辑,从而扩大了CRISPR技术的应用.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 克里斯普尔-卡斯系统对于基因组编辑和DNA检测至关重要.
- 第五型CRISPR-Cas系统使用像Cas12这样的单效应器.
- 挖掘微生物基因组数据对于发现新型遗传工具至关重要.
研究的目的:
- 为了识别和描述新的CRISPR-Cas效应器系统.
- 评估新发现系统的基因组编辑能力.
- 了解新型CRISPR-Cas核酶的进化关系.
主要方法:
- 大规模的基因组和元基因组数据挖掘.
- 核酶活动的生物化学测定.
- 在人类和植物细胞 (Oryza sativa,Zea mays) 中进行基因组编辑实验.
- 结构和进化分析.
主要成果:
- 发现了Casδ效应器超级家族 (三个成员).
- Casδ-1被确定为一种RNA引导的内核酶,具有特定的PAM识别 (5'-RYR-3').
- 证明了强大的DNA裂变和跨裂变活动.
- 在人体细胞中达到高达60%的indel率,在大米和玉米中达到同卵性淘汰.
- Casδ被认为是Cas12n和V型系统之间的进化桥梁.
结论:
- Casδ代表了一个新的,紧的,没有tracrRNA的CRISPR系统.
- Casδ 能够实现多功能跨王国的基因组编辑.
- 卡斯德的C端环对于其核酶活性至关重要.
- Casδ扩展了基因组工程应用的工具包.
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