DNA Replication Stress Response Pathways (RSR)

DNA Replication Stress Response Pathways refer to a complex network of cellular mechanisms that cells activate to cope with impediments during DNA replication. These pathways are crucial for maintaining genome integrity by stabilizing stalled replication forks, promoting DNA repair, and regulating cell cycle progression through checkpoints like the S-phase and G2/M checkpoints. Cancer cells often exhibit chronic replication stress due to oncogene activation and compromised DNA repair machinery, making them particularly reliant on these response pathways for survival. This dependency presents a therapeutic vulnerability, as inhibiting key components of these pathways can selectively kill cancer cells. Drugs targeting these pathways either induce further replication stress (e.g., DNA damaging agents, topoisomerase inhibitors) or directly inhibit response proteins such as ATR, CHK1, or PARP. While promising for cancer treatment, challenges include potential toxicity to healthy cells and the development of drug resistance.

Other names

Replication Stress ResponseDNA Replication StressReplication StressRSDNA Damage Response

Drugs targeting DNA Replication Stress Response Pathways either induce replication stress by damaging DNA, depleting nucleotide pools, or inhibiting DNA replication machinery, or they inhibit key components of the cellular response pathways (e.g., ATR, CHK1, PARP). This dual approach aims to overwhelm the cancer cell's ability to repair DNA damage and maintain genomic stability, leading to cell cycle arrest, apoptosis, or mitotic catastrophe. By disrupting these pathways, cancer cells, which often exhibit elevated intrinsic replication stress, become selectively vulnerable, enhancing the efficacy of genotoxic therapies.