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Zinc finger nuclease (ZFN) is a useful tool for endogenous site-directed genome modification. The development of an easier, less expensive and repeatedly usable construction method for various sequences of ZFNs should contribute to the further widespread use of this technology. Here, we establish a novel construction method for ZFNs. Zinc finger (ZF) fragments were synthesized by PCR using short primers coding DNA recognition helices of the ZF domain. DNA-binding domains composed of 4 to 6 ZFs were synthesized by overlap extension PCR of these PCR products, and the DNA-binding domains were joined with a nuclease vector by TA cloning. The short primers coding unique DNA recognition helices can be used repeatedly for other ZFN constructions. By using this novel OLTA ( O ver L ap extension PCR and  TA -cloning) method, arbitrary ZFN vectors were synthesized within 3 days, from the designing to the sequencing of the vector. Four different ZFN sets synthesized by OLTA showed nuclease activities at endogenous target loci. Genetically modified mice were successfully generated using ZFN vectors constructed by OLTA. This method, which enables the construction of intended ZFNs repeatedly and inexpensively in a short period of time, should contribute to the advancement of ZFN technology.

Repeatable Construction Method for Engineered Zinc Finger Nuclease Based on Overlap Extension PCR and TA-Cloning