The need for speed: drivers and consequences of accelerated replication forks

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• DNA replication dynamics are crucial for genome stability.
• Replication fork rate is modulated by DNA repair, chromatin, transcription, and oncogenic signaling.

Purpose of the Study:

• To review molecular mechanisms of replication fork acceleration.
• To discuss the role of fork acceleration in genome stability and disease, particularly cancer.

Main Methods:

• Literature review of recent findings.
• Focus on specific scenarios: PARP inhibition, oncogene activation, replication factor depletion, Okazaki fragment processing defects.
• Discussion of contributing factors: origin firing, R-loop resolution, metabolic changes, innate immune signaling (cGAS-STING, ISG15).

Main Results:

• Replication fork acceleration is driven by diverse molecular mechanisms.
• Factors influencing fork rate include DNA repair, origin firing, chromatin, transcription, and oncogenic signaling.
• Accelerated forks have significant consequences for genome stability and disease progression, especially cancer.

Conclusions:

• Understanding replication fork acceleration is key to genome integrity and cellular homeostasis.
• Insights into fork acceleration mechanisms offer potential therapeutic strategies for cancer.
• Further research is needed to fully elucidate the complex interplay of factors affecting replication fork dynamics.