Modular cytosine base editing promotes epigenomic and genomic modifications

Area of Science:

• Molecular Biology
• Genetics
• Immunology

Background:

• Adaptive immunity in prokaryotes and eukaryotes utilizes distinct gene editing mechanisms, notably Cas9 and activation-induced deaminase (AID).
• Activation-induced deaminase (AID) is crucial for antibody diversification and epigenomic reprogramming in B cells, but its precise catalytic activities and targeted DNA recruitment remain challenging to harness.
• Existing cytosine base editors cannot fully replicate AID's genomic and epigenomic editing functionalities.

Purpose of the Study:

• To develop a modular AID-based editor capable of recapitulating the complete range of AID's genomic and epigenomic editing activities.
• To create a versatile research tool for a deeper understanding of AID biology.
• To enhance the precision and scope of targeted genomic and epigenomic editing.

Main Methods:

• Engineering a modular editor system based on activation-induced deaminase (AID).
• Characterizing the editor's ability to perform genomic and epigenomic modifications.
• Evaluating the editor's capacity to mimic AID's full spectrum of activities.

Main Results:

• The first modular AID-based editor successfully recapitulates the full spectrum of genomic and epigenomic editing activity.
• The developed 'Swiss army knife' toolbox provides a novel platform for studying AID.
• The editor demonstrates improved capabilities compared to existing cytosine base editors.

Conclusions:

• A novel modular AID-based editor has been successfully developed, offering unprecedented recapitulation of AID's editing functions.
• This research provides a valuable tool for advancing the study of AID biology and its applications in targeted gene and epigenome editing.
• The findings pave the way for improved precision and broader applications in genomic and epigenomic research.