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mtDNA base editing: Mind the gap.

Jose Domingo Barrera-Paez1, Carlos T Moraes2

  • 1MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK.

Molecular Cell
|September 19, 2025
PubMed
Summary

Researchers engineered DdCBE for precise mitochondrial DNA base editing. Defining the editing window improved accuracy, advancing base editing technology.

Area of Science:

  • Molecular biology
  • Genetics
  • Biochemistry

Background:

  • Mitochondrial DNA (mtDNA) base editing offers therapeutic potential but faces challenges in precision.
  • Cytidine base editors (CBEs) are tools for base editing, but their application in mitochondria requires optimization.

Purpose of the Study:

  • To elucidate the mechanism of DdCBE for mitochondrial DNA base editing.
  • To engineer DdCBE for enhanced precision and efficiency in mtDNA editing.
  • To guide engineering efforts using structural insights.

Main Methods:

  • Structure-guided engineering of DdCBE.
  • Biochemical assays to assess editing activity and precision.
  • Analysis of the editing window to optimize targeting.

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Main Results:

  • Xiang et al. provided key insights into the mechanism of DdCBE.
  • Structure-guided engineering led to improved DdCBE variants.
  • Precise mtDNA base editing was achieved by defining the editing window.

Conclusions:

  • DdCBE can be effectively engineered for precise mitochondrial DNA base editing.
  • Understanding the mechanism and editing window is crucial for optimizing base editors.
  • This work advances the development of mtDNA base editing tools.