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在CRISPR-Cas系统中广泛存在的CRISPR衍生RNA调控元素
Sergey A Shmakov1, Zachary K Barth2, Kira S Makarova1
1National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD 20894, USA.
Nucleic acids research
|June 7, 2023
概括
研究人员发现了CRISPR-Cas系统的新型调节作用. 这些系统中的独立重复可以形成小数组,作为控制基因表达的指南,并可能逃避免疫反应.
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 遗传学 是一个
背景情况:
- 克里斯普尔-卡斯系统是使用克里斯普尔 (集群定期间隔的短Palindromic重复) 阵列和卡斯蛋白的 prokaryotic 免疫机制.
- 这些系统通常从重复间隔序列生成CRISPR (cr) RNA,以向外来核酸进行降解.
- 一些CRISPR-Cas位点含有独立的重复,产生具有潜在调节功能的crRNA类分子.
研究的目的:
- 在多种CRISPR-Cas系统中,系统地识别和描述独立的重复元素及其相关功能.
- 研究这些元素在基因表达和免疫规避中的潜在调节作用.
主要方法:
- 开发一个计算管道,以检测在CRISPR-Cas loci.中保存的独立重复序列.
- 生物信息分析以识别由独立的重复和间隔器形成的迷你数组结构.
- 来自I-F1型CRISPR-Cas系统的迷你阵列调节功能的实验验证.
主要成果:
- 许多类似crRNA的元素,主要是在I型和V-A型CRISPR-Cas系统中,被确定为独立的重复,形成小数组.
- 这些迷你阵列通常包含与cas基因或货物基因的促进子区域相补充的间隔器,例如毒素-抗毒素系统.
- 实验证据证实,小型阵列作为调节指南,菌体中的类似结构可以抑制CRISPR免疫力.
结论:
- 通过部分目标互补的间隔器来为监管目的招募CRISPR效应器是各种CRISPR-Cas系统中普遍存在的现象.
- 独立的重复和迷你阵列代表了CRISPR-Cas生物学中的重要,以前被低估的调节层.
- 这些发现扩大了我们对CRISPR-Cas系统多功能性的理解,超出了适应性免疫.
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