Cell cycle checkpoint

Cell cycle checkpoints are sophisticated surveillance mechanisms that monitor the integrity and fidelity of DNA replication and chromosome segregation during the cell cycle (StatPearls, PMID: 32644485). These checkpoints—primarily at the G1/S, intra-S, and G2/M transitions—ensure that a cell does not proceed to the next phase until DNA damage is repaired or environmental conditions are favorable (Nature Reviews Cancer, PMID: 11902573). In oncology, these mechanisms are often dysregulated, with cancer cells frequently losing the G1 checkpoint (often via p53 mutation) and becoming heavily reliant on the G2/M checkpoint for survival (Journal of Hematology & Oncology, PMID: 31053123). Pharmacological targeting of checkpoint proteins like CDK4/6, Wee1, and ATR aims to exploit these vulnerabilities to induce cell cycle arrest or 'mitotic catastrophe' (Nature Reviews Drug Discovery, PMID: 27909335). While 'cell cycle checkpoint' is a broad biological process rather than a single molecule, it represents a critical therapeutic axis in modern precision medicine. Therapeutic strategies often involve combining these inhibitors with DNA-damaging agents to maximize synthetic lethality in tumor cells (Cancer Cell, PMID: 28262552).

Other names

Cell cycle control systemDNA damage checkpointMitotic checkpointCell cycle regulatory pathway

Inhibition of specific checkpoint kinases (e.g., CDK4/6, CHK1/2, Wee1, ATR, or ATM) to induce cell cycle arrest or trigger mitotic catastrophe and apoptosis in cells with genomic instability.