How to fix DNA-protein crosslinks.

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• DNA-protein crosslinks (DPCs) are toxic DNA lesions formed by various agents.
• DPCs impede essential DNA processes like replication and transcription, threatening genome stability.
• Diverse DPC structures suggest multiple repair pathways exist.

Purpose of the Study:

• To review current knowledge on DNA-protein crosslink repair mechanisms.
• To explore replication-coupled DPC repair and pathways active outside S phase.
• To highlight the dual role of DPCs in DNA damage and protection.

Main Methods:

• Literature review of DPC formation, repair, and function.
• Analysis of enzymes involved in DPC processing (protein, DNA, or crosslink).
• Discussion of cell cycle-dependent DPC repair pathway choices.

Main Results:

• Detailed understanding of DPC repair during S phase is emerging.
• Multiple enzymes and pathways contribute to DPC removal.
• DPCs can play a protective role against other DNA damaging events.

Conclusions:

• DPC repair is complex and pathway choice depends on cellular context.
• Replication-coupled repair is a key mechanism for handling DPCs.
• DPCs have a newly recognized protective function in genome maintenance.