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Area of Science:

  • Molecular Biology
  • Gene Editing Technologies
  • Biochemistry

Background:

  • CRISPR-Cas9 fused with cytidine deaminases creates base editors (BEs) for C-to-T editing.
  • Clinical applications of BEs are limited by off-target (OT) mutations.
  • Developing highly specific base editing tools is crucial for therapeutic applications.

Purpose of the Study:

  • To develop a novel base editor system with significantly reduced off-target mutations.
  • To enhance the specificity and safety of CRISPR-based gene editing.
  • To evaluate the in vivo efficacy of the new base editing system.

Main Methods:

  • Constructed a transformer base editor (tBE) system by fusing a cleavable deoxycytidine deaminase inhibitor (dCDI) domain to a base editor.
  • Designed the tBE to remain inactive at off-target sites until cleaved at on-target sites.
  • Delivered the tBE system into mice using a dual-adeno-associated virus (AAV) system.

Main Results:

  • The tBE system demonstrated efficient on-target editing with only background levels of genome-wide and transcriptome-wide OT mutations.
  • In vivo delivery of tBE created a premature stop codon in the Pcsk9 gene in mice.
  • Reduced serum PCSK9 levels by approximately 30-40%, leading to a significant decrease in total cholesterol.

Conclusions:

  • The transformer base editor (tBE) system represents a highly specific base editing technology.
  • The tBE system effectively minimizes unintended mutations, enhancing safety.
  • The demonstrated in vivo efficacy suggests significant potential for therapeutic applications in treating genetic disorders.