DNA Damage Response and Replication Stress Machinery (DDR-RSR)

The combined DNA integrity and replication machinery refers to the integrated network of proteins responsible for maintaining genomic stability during the S-phase of the cell cycle. This system coordinates the progression of the DNA replication fork with the DNA Damage Response (DDR) to ensure that DNA is accurately copied and repaired before cell division. Key components include master regulatory kinases such as ATR, ATM, and CHK1, as well as the replisome complex and various DNA repair enzymes like PARP. In cancer, this machinery is often deregulated, leading to chronic replication stress, which serves as a critical vulnerability that can be exploited by targeted therapies. Drugs targeting this system, such as PARP inhibitors and ATR inhibitors, aim to induce catastrophic DNA damage and apoptosis specifically in tumor cells that lack redundant repair pathways, a concept known as synthetic lethality.

Other names

DNA integrity and replication machineryReplication stress response pathwayGenomic stability maintenance networkDDR networkReplisome-DDR axis

Inhibition of checkpoint kinases (ATR, CHK1, WEE1) to induce replication fork collapse; PARP inhibition to trap DNA repair complexes; induction of lethal DNA damage through synthetic lethality.