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Improved USER cloning for TALE assembly and its application to base editing.

Jizeng Zhou1, Jiaowei Wang2, Fangbing Chen2

  • 1School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, China.

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|August 4, 2023
PubMed
Summary
This summary is machine-generated.

A new USER cloning method simplifies the construction of Transcription activator-like effectors (TALEs). This rapid technique enables efficient base editing with reduced off-target DNA effects, benefiting laboratory applications.

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Area of Science:

  • Molecular Biology
  • Gene Editing Technologies
  • Synthetic Biology

Background:

  • Transcription activator-like effectors (TALEs) are versatile tools for genome editing, transcriptional regulation, and DNA imaging.
  • Traditional TALE construction is complex and time-consuming, limiting their routine laboratory use.

Purpose of the Study:

  • To develop a simple, rapid, and laboratory-friendly method for TALE assembly.
  • To create efficient base editing systems using the improved TALE construction technique.

Main Methods:

  • Utilized uracil-specific excision reagent (USER) cloning for TALE assembly.
  • Employed polymerase chain reaction with TALE trimer templates and deoxyuridine-containing primers.
  • Hierarchically rejoined TALE trimer units using USER and T4 DNA Ligase for high-efficiency vector construction.

Main Results:

  • Successfully constructed TALE-deaminases using the USER assembly method.
  • Demonstrated efficient C-to-T and A-to-G base editing when TALE-deaminases were combined with Cas9 nickases.
  • Eliminated predictable DNA off-target effects in base editing applications.

Conclusions:

  • The improved USER assembly is a highly efficient and rapid technique for TALE construction.
  • This method simplifies TALE-based genome engineering and base editing.
  • The technique offers a valuable, laboratory-friendly approach for DNA targeting applications.