DNA damage and apoptotic signaling network (DDR/Apoptosis Network)

The DNA damage and apoptotic signaling network is a complex regulatory framework that maintains genomic integrity by coordinating DNA repair, cell cycle progression, and programmed cell death (Lord & Ashworth, 2012, Nature). It comprises several interconnected pathways, most notably the DNA damage response (DDR), which employs sensor proteins like the MRN complex to detect lesions and activate master kinases such as ATM, ATR, and DNA-PK (O'Connor, 2015, Molecular Cell). These kinases signal to downstream effectors like p53, which can induce cell cycle arrest to allow for repair or, if the damage is irreparable, trigger apoptosis via the BCL-2 family of proteins (Roos & Kaina, 2013, Cancer Letters). In oncology, this network is frequently dysregulated, providing a mechanism for tumor cells to survive despite high levels of genomic instability. Therapeutic strategies often target specific nodes within this network, such as PARP inhibitors (e.g., Olaparib) for BRCA-mutant cancers or BCL-2 inhibitors (e.g., Venetoclax) to restore apoptotic sensitivity (FDA, 2023). Understanding the crosstalk within this network is crucial for developing combination therapies and overcoming drug resistance in various diseases.

Other names

DNA damage response (DDR)DNA damage-induced apoptosisGenotoxic stress responseDDR-apoptosis axis

Inhibition of DNA repair enzymes (e.g., PARP, ATR, ATM), antagonism of anti-apoptotic proteins (e.g., BCL-2), and induction of synthetic lethality in cells with pre-existing DNA repair deficiencies (Lord & Ashworth, 2012, Nature).