Article

Plant Molecular Biology

, Volume 78, Issue 4, pp 407-416

Rapid and highly efficient construction of TALE-based transcriptional regulators and nucleases for genome modification

  • Lixin LiAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology
  • , Marek J. PiatekAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology
  • , Ahmed AtefAffiliated withDepartment of Biological Sciences, Faculty of Sciences, King Abdulaziz University
  • , Agnieszka PiatekAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology
  • , Anjar WibowoAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology
  • , Xiaoyun FangAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology
  • , J. S. M. SabirAffiliated withDepartment of Biological Sciences, Faculty of Sciences, King Abdulaziz University
  • , Jian-Kang ZhuAffiliated withDepartment of Horticulture and Landscape Architecture, Purdue University Email author 
  • , Magdy M. MahfouzAffiliated withDivision of Chemical and Life Sciences and Engineering, King Abdullah University of Science and Technology Email author 

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Abstract

Transcription activator-like effectors (TALEs) can be used as DNA-targeting modules by engineering their repeat domains to dictate user-selected sequence specificity. TALEs have been shown to function as site-specific transcriptional activators in a variety of cell types and organisms. TALE nucleases (TALENs), generated by fusing the FokI cleavage domain to TALE, have been used to create genomic double-strand breaks. The identity of the TALE repeat variable di-residues, their number, and their order dictate the DNA sequence specificity. Because TALE repeats are nearly identical, their assembly by cloning or even by synthesis is challenging and time consuming. Here, we report the development and use of a rapid and straightforward approach for the construction of designer TALE (dTALE) activators and nucleases with user-selected DNA target specificity. Using our plasmid set of 100 repeat modules, researchers can assemble repeat domains for any 14-nucleotide target sequence in one sequential restriction-ligation cloning step and in only 24 h. We generated several custom dTALEs and dTALENs with new target sequence specificities and validated their function by transient expression in tobacco leaves and in vitro DNA cleavage assays, respectively. Moreover, we developed a web tool, called idTALE, to facilitate the design of dTALENs and the identification of their genomic targets and potential off-targets in the genomes of several model species. Our dTALE repeat assembly approach along with the web tool idTALE will expedite genome-engineering applications in a variety of cell types and organisms including plants.

Keywords

Genome engineering TALE-based activators and repressors TALE nucleases (TALENs) Targeted mutagenesis Targeted activation and repression Genome modifications