PPP1CC encodes protein phosphatase 1 catalytic subunit gamma, a serine/threonine phosphatase that forms highly specific holoenzymes with over 200 regulatory proteins to dephosphorylate hundreds of biological targets 1. The gene undergoes tissue-specific splicing, producing a ubiquitously expressed isoform (PPP1CC1) and a testis-enriched, sperm-specific isoform (PPP1CC2) essential for spermatogenesis completion 1. PPP1CC plays critical roles in multiple cellular processes including DNA repair, where it promotes nonhomologous end joining (NHEJ) by binding Ku70/Ku80 heterodimers and activating DNA-PKcs, leading to radioresistance in nasopharyngeal carcinoma 2. The protein regulates cell death pathways by dephosphorylating RIPK1 through recruitment by PPP1R3G, promoting both apoptosis and necroptosis 3. Additionally, PPP1CC functions as a tumor suppressor in cell competition by integrating apoptosis and ferroptosis-like cell death via JNK signaling activation 4. The gene is located on chromosome 12.1-q24.2 5 and shows associations with muscle strength phenotypes 6 and platelet regulation in immune thrombocytopenia 7. These diverse functions highlight PPP1CC's importance in cellular homeostasis, cancer biology, and potential therapeutic applications.