Oligo- and dsDNA-mediated genome editing using a tetA dual selection system in Escherichia coli.
Oligo- and dsDNA-mediated genome editing using a tetA dual selection system in Escherichia coli.
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DOI:
10.1371/journal.pone.0181501
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Lee SK
中科院分区:
文献类型:
--
作者:
Ryu YS;Chandran SP;Kim K;Lee SK
The ability to precisely and seamlessly modify a target genome is needed for metabolic engineering and synthetic biology techniques aimed at creating potent biosystems. Herein, we report on a promising method in Escherichia coli that relies on the insertion of an optimized tetA dual selection cassette followed by replacement of the same cassette with short, single-stranded DNA (oligos) or long, double-stranded DNA and the isolation of recombinant strains by negative selection using NiCl2. This method could be rapidly and successfully used for genome engineering, including deletions, insertions, replacements, and point mutations, without inactivation of the methyl-directed mismatch repair (MMR) system and plasmid cloning. The method we describe here facilitates positive genome-edited recombinants with selection efficiencies ranging from 57 to 92%. Using our method, we increased lycopene production (3.4-fold) by replacing the ribosome binding site (RBS) of the rate-limiting gene (dxs) in the 1-deoxy-D-xylulose-5-phosphate (DXP) biosynthesis pathway with a strong RBS. Thus, this method could be used to achieve scarless, proficient, and targeted genome editing for engineering E. coli strains.
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DOI:
10.1073/pnas.121164898
发表时间:
2001-06-05
影响因子:
11.1
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