Ubiquitin and SUMO pathways in DNA replication and replication-coupled repair

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Accurate DNA replication is vital for preventing genome instability.
• Post-translational modifications, including ubiquitination and SUMOylation, tightly regulate DNA replication processes.
• Reversible modifications like ubiquitin and SUMO play critical roles in DNA replication and replication-coupled repair.

Purpose of the Study:

• To review recent advances in understanding ubiquitin and SUMO pathways in DNA replication.
• To compare findings in yeast and vertebrate systems regarding these modification pathways.
• To elucidate the roles of these modifications in coordinating the replication stress response.

Main Methods:

• Literature review of recent advances in DNA replication and repair.
• Comparative analysis of ubiquitin and SUMO signaling in yeast and vertebrate models.
• Examination of genome surveillance pathways and tolerance mechanisms.

Main Results:

• Ubiquitin and SUMO signaling are critical for DNA replication and repair.
• Stalled replication forks are remodeled and stabilized, facilitating restart.
• Ubiquitin and SUMO act synergistically, with SUMO-targeted ubiquitin ligases sequestering forks and promoting restart.
• Cellular mechanisms, including DNA damage tolerance and Fanconi anemia pathways, prevent under-replication.

Conclusions:

• Ubiquitin and SUMO modifications are essential regulators of DNA replication and the replication stress response.
• These modifications orchestrate fork stabilization, restart, and lesion tolerance, maintaining genome integrity.
• Synergistic action of ubiquitin and SUMO signaling, particularly via SUMO-targeted ubiquitin ligases, is crucial for managing replication stress and enabling DNA synthesis continuation.