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Human cell based directed evolution of adenine base editors with improved efficiency.

Junhao Fu1, Qing Li2, Xiaoyu Liu1

  • 1School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, State Key Laboratory and Key Laboratory of Vision Science, Ministry of Health and Zhejiang Provincial Key Laboratory of Ophthalmology and Optometry, Wenzhou, Zhejiang, China.

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Summary

Researchers developed a new screening system to improve adenine base editors (ABE), creating high-activity NG-ABEmax variants. These enhanced editors show superior performance in human cells and animal models, advancing genome editing capabilities.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Adenine base editors (ABE) enable precise A•T to G•C conversions for genome editing.
  • Low activity at certain genomic sites limits the efficacy of current ABE systems.

Purpose of the Study:

  • To develop a screening system for evolving ABE deaminase components.
  • To identify and engineer high-activity ABE variants for improved genome editing.

Main Methods:

  • A directional screening system was developed in human cells.
  • The deaminase component of ABE was evolved to create new variants.
  • Engineered variants were tested for editing activity in human cells and mouse models.

Main Results:

  • Three high-activity NG-ABEmax variants (NG-ABEmax-SGK, NG-ABEmax-R, NG-ABEmax-K) were identified.
  • A consolidated variant, NG-ABEmax-KR, demonstrated superior editing activity compared to the original NG-ABEmax.
  • NG-ABEmax-KR significantly increased editing activity for natural mutations in gamma globin gene promoters.

Conclusions:

  • The developed screening platform is broadly applicable for evolving base editors.
  • NG-ABEmax-KR represents a significant advancement in ABE efficiency and applicability.
  • This work provides a method to enhance base editor traits beyond increased editing activity.