Dynamics of single-base editing: Theoretical analysis

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Recent advances have yielded DNA base editors (BEs) capable of single-nucleotide precision.
• Understanding the molecular mechanisms governing single-base discrimination in BEs is crucial for advancing genetic technologies.

Purpose of the Study:

• To theoretically investigate the dynamics of single-base editing using a stochastic approach.
• To evaluate the transient and mean editing times for target and bystander locations.
• To analyze the impact of mutations on base editing dynamics.

Main Methods:

• Theoretical investigation using a stochastic approach.
• Explicit evaluation of editing times for "TC" motifs by cytosine BEs.
• Analysis of mutation effects on single-base editing dynamics.

Main Results:

• Transient separation of target and bystander products is achievable across various parameter ranges, supporting dynamic selectivity.
• The study identified distinct strategies for improving base editing efficiency by selecting probability versus time.
• Physical-chemical arguments were presented to elucidate the observed dynamic properties.

Conclusions:

• Dynamic selectivity offers a promising strategy for enhancing the precision of single-base editing.
• Optimizing base editor efficiency necessitates tailored strategies based on probability or temporal selection.
• The theoretical analysis provides clarity on the molecular mechanisms underlying selective base editing.