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
中科院分区:
文献类型:
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作者:
Lyozin, George T.;Bressloff, Paul C.;Kumar, Amit;Kosaka, Yasuhiro;Demarest, Bradley L.;Yost, H. Joseph;Kuehn, Michael R.;Brunelli, Luca
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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