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Internally inlaid SaCas9 base editors enable window specific base editing.

Lurong Jiang1, Jie Long1, Yang Yang1

  • 1Laboratory of Biotherapy, National Key Laboratory of Biotherapy, Cancer Center, West China Hospital, Sichuan university, Renmin Nanlu 17, Chengdu 610041, Sichuan, China.

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Summary

New base editors with inlaid deaminases offer broader genome editing scope and diverse editing patterns. These tools expand the editing window and improve efficiency for precise base conversions.

Keywords:
CRISPR/Cas9base editingediting windowoff-targetthalassemia

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biotechnology

Background:

  • Base editors utilize deactivated Cas9 fused with deaminases for genome editing.
  • Current base editors have limited editing windows, restricting their application.
  • Expanding editing scope and diversifying patterns are crucial for base editor utility.

Purpose of the Study:

  • To engineer novel base editors with enhanced targeting scope and varied editing patterns.
  • To overcome the limitations of fixed and narrow editing windows in existing base editors.

Main Methods:

  • Designed SaCas9-derived base editors with inlaid cytosine deaminase at various positions.
  • Characterized engineered base editors at multiple genomic sites.
  • Evaluated editing efficiency, window size, and off-target effects.

Main Results:

  • Sa-CBE-693 exhibited increased efficiency and an expanded editing window (bases 2-18).
  • Sa-CBE-693 enhanced editing of the BCL11A enhancer.
  • Sa-CBE-125 demonstrated a backward-shifted window effective for editing specific cytosines.
  • Engineered editors showed reduced Cas9-independent off-target editing compared to Sa-CBE-N.

Conclusions:

  • Inlaid base editors significantly improve targeting scope.
  • Engineered editors offer diversified editing patterns for greater versatility.
  • These advancements provide more flexible and efficient genome editing tools.