Isolation of rare recombinants without using selectable markers for one-step seamless BAC mutagenesis.

Isolation of rare recombinants without using selectable markers for one-step seamless BAC mutagenesis.
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DOI:
10.1038/nmeth.3030
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发表时间:
2014-09
期刊:
影响因子:
48
通讯作者:
Brunelli, Luca
Brunelli, Luca
中科院分区:
生物学1区
文献类型:
--
作者:
Lyozin, George T.;Bressloff, Paul C.;Kumar, Amit;Kosaka, Yasuhiro;Demarest, Bradley L.;Yost, H. Joseph;Kuehn, Michael R.;Brunelli, Luca

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目前的实验室方法分离罕见的(1:10万至1:10万)细菌人工染色体(BAC)重组需要可选择的标记。无缝BAC突变需要两个步骤:使用可选择的标记分离罕见的重组,然后通过反选择去除标记。在这里,我们展示了创始人原理驱动富集(FPE),这是一种简单的方法,可以快速分离罕见的重组,而不使用可选择的标记,允许一步无缝的BAC突变。作为原理证明,我们通过FPE分离出1:10万无缝荧光蛋白修饰的Nodal BAC,并通过产生荧光报告小鼠来证实BAC的功能。我们还分离了小的indel p1噬菌体衍生的人工染色体(PAC)和BAC重组体。统计分析显示,运行<40个pcr可以分离出1:10万重组体,我们开发了一个基于网络的计算器来优化FPE。通过消除对选择-反选择的需要,这项工作强调了一种简单而低成本的BAC诱变方法,为功能基因组学中的无缝重组管道提供了工具。
Current laboratory methods to isolate rare (1:10,000 to 1:100,000) bacterial artificial chromosome (BAC) recombinants require selectable markers. Seamless BAC mutagenesis needs two steps: isolation of rare recombinants using selectable markers, followed by marker removal through counterselection. Here we illustrate founder principle-driven enrichment (FPE), a simple method developed to rapidly isolate rare recombinants without using selectable markers, allowing one-step seamless BAC mutagenesis. As proof-of-principle, we isolated 1:100,000 seamless fluorescent protein-modified Nodal BACs via FPE and confirmed BAC functionality by generating fluorescent reporter mice. We also isolated small indel P1-phage derived artificial chromosome (PAC) and BAC recombinants. Statistical analysis revealed that 1:100,000 recombinants can be isolated running <40 PCRs and we developed a web-based calculator to optimize FPE. By eliminating the need for selection-counterselection, this work highlights a straightforward and low-cost approach to BAC mutagenesis, providing a tool for seamless recombineering pipelines in functional genomics.
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