Repeating pattern of non-RVD variations in DNA-binding modules enhances TALEN activity

Area of Science:

• Molecular Biology
• Gene Editing Technologies
• Biotechnology

Background:

• Transcription activator-like effector nucleases (TALENs) are engineered DNA-binding proteins with nuclease activity.
• Various TALEN construction methods exist, but functional comparisons of different TALEN structures are limited.
• Understanding structural impacts on TALEN functionality is crucial for optimizing gene-editing tools.

Purpose of the Study:

• To compare the functionalities of structurally different TALENs targeting the same genomic loci.
• To evaluate the efficacy of TALENs with non-repeat-variable di-residue (non-RVD) variations, termed Platinum TALENs.
• To introduce an efficient system for constructing highly active Platinum TALENs.

Main Methods:

• HEK293T cell-based assays, including single-strand annealing and Cel-I nuclease assays.
• Comparison of TALENs with periodically-patterned repeat variants (Platinum TALENs) versus those without non-RVD variations.
• Assessment of gene disruption efficiencies in frog and rat models.

Main Results:

• Platinum TALENs exhibited significantly higher nuclease activity compared to TALENs lacking non-RVD variations.
• Gene disruption efficiencies mediated by Platinum TALENs in vivo were substantially improved over previous reports.
• The Platinum Gate system facilitates the efficient construction of these high-activity TALENs.

Conclusions:

• Structurally distinct TALENs, specifically Platinum TALENs, display superior gene-editing performance.
• The developed Platinum Gate system provides an efficient method for generating highly active TALENs.
• This work may establish a new benchmark for TALEN engineering and application in genome editing.