tCRISPRi: tunable and reversible, one-step control of gene expression.

tCRISPRi: tunable and reversible, one-step control of gene expression.
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DOI:
10.1038/srep39076
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发表时间:
2016-12-20
期刊:
影响因子:
4.6
通讯作者:
Jun S
Jun S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li XT;Jun Y;Erickstad MJ;Brown SD;Parks A;Court DL;Jun S

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控制基因表达水平的能力是生物学中的一个主要探索。广泛使用的方法采用感兴趣的非必需基因的缺失(敲除),或多步重组工程以将感兴趣的基因移动到可抑制的启动子下(敲低)。然而,这些遗传学方法是费力的,并且限制了定量研究。在这里,我们报告了一个可调的CRISPR-cas系统,“tCRISPRi”,用于精确和连续滴定基因表达超过30倍。我们的tCRISPRi系统将各种先前的进展应用到单个菌株中:(1)我们构建了含有可调阿拉伯糖操纵子启动子PBAD的新菌株,以在无质粒系统中定量控制CRISPR-(d)Cas蛋白的表达超过两个数量级。(2)tCRISPRi是可逆的,基因表达在敲低条件下被抑制。(3)tCRISPRi显示显著小于10%的渗漏表达。(4)从实践的角度来看,最重要的是,靶向新基因的tCRISPRi的构建只需要一步寡核苷酸重组工程。我们的研究结果表明,tCRISPRi与重组工程相结合,为基因表达控制提供了一种简单且易于实施的工具,并且非常适合于构建单个菌株和高通量可调敲低文库。
The ability to control the level of gene expression is a major quest in biology. A widely used approach employs deletion of a nonessential gene of interest (knockout), or multi-step recombineering to move a gene of interest under a repressible promoter (knockdown). However, these genetic methods are laborious, and limited for quantitative study. Here, we report a tunable CRISPR-cas system, “tCRISPRi”, for precise and continuous titration of gene expression by more than 30-fold. Our tCRISPRi system employs various previous advancements into a single strain: (1) We constructed a new strain containing a tunable arabinose operon promoter PBAD to quantitatively control the expression of CRISPR-(d)Cas protein over two orders of magnitude in a plasmid-free system. (2) tCRISPRi is reversible, and gene expression is repressed under knockdown conditions. (3) tCRISPRi shows significantly less than 10% leaky expression. (4) Most important from a practical perspective, construction of tCRISPRi to target a new gene requires only one-step of oligo recombineering. Our results show that tCRISPRi, in combination with recombineering, provides a simple and easy-to-implement tool for gene expression control, and is ideally suited for construction of both individual strains and high-throughput tunable knockdown libraries.
细胞大小和细菌中DNA复制的启动。
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