Science:张锋发现可用于编辑RNA的CRISPR系统

2016-06-03 coo 生物360

包括Feng Zhang在内的研究人员已经证实,一种细菌蛋白确实能被用作替代编辑方法;该蛋白被假设是一个可用于RNA靶向编辑的工具,就像CRISPR-Cas9以DNA作为编辑标靶的方式。这一发现对一系列的生物学应用都具重要意义,这些应用包括RNA的标记、修饰和调节。所有种类的细菌中大约有一半会利用一种被称作“规律间隔成簇短回文重复序列及CRISPR相关基因(CRISPR-Cas)”的免疫系统,该系


包括Feng Zhang(张锋)在内的研究人员已经证实,一种细菌蛋白确实能被用作替代编辑方法;该蛋白被假设是一个可用于RNA靶向编辑的工具,就像CRISPR-Cas9以DNA作为编辑标靶的方式。这一发现对一系列的生物学应用都具重要意义,这些应用包括RNA的标记、修饰和调节。

所有种类的细菌中大约有一半会利用一种被称作“规律间隔成簇短回文重复序列及CRISPR相关基因(CRISPR-Cas)”的免疫系统,该系统能保护微生物免于受到病毒和其它入侵DNA的侵害。” 

虽然近年的许多注意力聚焦于利用CRISPR-Cas来编辑DNA的能力,但特异性的针对RNA的系统则研究得较少。Feng Zhang和同事在此根据先前的研究怀疑某单一效应蛋白——来自细菌Leptotrichia shahii的C2c2可能是以RNA为标靶的候选蛋白,这一怀疑得到了证实。

通过一系列的实验中,研究人员证明C2c2可被用来切断单股RNA,但双股RNA则不行;还有,它可在体内被用来敲出细菌的信使RNA。在测试C2c2在大肠杆菌中将特定DNA作为标靶的能力时,该团队发现,这一效应器最初聚焦于它的标靶RNA,随后发生的则是第二阶段的RNA非特异性降解。

作者说,有可能存在其它的RNA靶向免疫系统,进一步的研究将导致用于体内RNA操纵的可编程分子工具的研发。作者们说,RNA操纵的一个例子包括用效应器分子来调节RNA的功能和翻译(它可被用于大规模筛检),构建合成的调控回路及用于其它目的。

原始出处:

Omar O. Abudayyeh,et al. C2c2 is a single-component programmable RNA-guided RNA-targeting CRISPR effector.Science  02 Jun 2016.

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    2016-06-05 沉心多思

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    2016-06-05 沉心多思

    不错的文章,多学习

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    2016-06-05 yuandd
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    2016-06-05 jichang
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    2016-06-04 忠诚向上

    能什么时候用于临床

    0

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    2016-06-03 wxsession4b6a9060

    以后的基因编辑也会成为完整系统。

    0

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