The B cell dilemma: Diversity or fidelity?

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• B lymphocytes are crucial for adaptive immunity, producing antibodies through immunoglobulin (Ig) gene diversification.
• Key processes include V(D)J recombination, somatic hypermutation (SHM), and class switch recombination (CSR).
• These processes involve programmed DNA lesions and repair pathways, creating a balance between diversification and genome stability.

Purpose of the Study:

• To review how B cells manage DNA repair for immunoglobulin gene diversification.
• To explore the mechanisms balancing immune receptor generation with genome integrity.
• To integrate foundational and recent advances in B cell DNA repair regulation.

Main Methods:

• Literature review integrating foundational studies and recent mechanistic advances.
• Analysis of DNA remodeling processes in B cell development and maturation.
• Examination of regulatory networks controlling DNA repair pathways.

Main Results:

• B cells employ V(D)J recombination, SHM, and CSR for antibody diversification.
• These processes induce DNA lesions resolved by repair pathways, posing risks of genome instability.
• Complex regulatory networks evolved to ensure efficient diversification while minimizing deleterious repair outcomes.

Conclusions:

• B cells strategically exploit, coordinate, and constrain DNA repair mechanisms.
• This intricate regulation is essential for balancing antibody diversification and preserving genome integrity.
• Understanding these processes is key to addressing B cell malignancies linked to DNA repair errors.