DNA damage responses that enhance resilience to replication stress

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Eukaryotic DNA replication is vulnerable to exogenous and endogenous stresses, including chemical alterations, nucleotide pool imbalances, repetitive sequences, DNA-protein complexes, and transcription conflicts.
• Unresolved stalled replication forks can result in chromosome breaks, genomic instability, and cancer development, particularly in cancer cells with compromised DNA repair or heightened replication-transcription conflicts.

Purpose of the Study:

• To review the DNA damage responses activated at stressed replication forks.
• To summarize pathways that ensure faithful chromosome replication and maintain chromosome integrity.
• To highlight the role of replication stress responses in selective cancer chemotherapies.

Main Methods:

• Review of existing literature on DNA damage responses and replication stress.
• Analysis of key pathways involved in replication fork stability and genome integrity.
• Focus on ATR-dependent signaling, DNA cross-link repair, and SLX4-mediated responses.

Main Results:

• Cells possess diverse mechanisms to enhance replication machinery resilience against stress.
• Key pathways include ATR-dependent replication checkpoint signaling, DNA cross-link repair, and SLX4-mediated responses to DNA-protein complexes.
• Replication stress responses are crucial for protecting chromosome integrity.

Conclusions:

• Understanding replication stress responses is vital for comprehending genomic instability and cancer development.
• These cellular defense mechanisms are critical for maintaining genome stability.
• Targeting replication stress pathways holds promise for developing effective cancer chemotherapies.