NEK11

NEK11, a serine/threonine kinase of the NIMA-related kinase family, primarily regulates cell cycle progression through the DNA damage response (DDR)^[1][2]. Mechanistically, NEK11 is activated downstream of Chk1 following DNA damage, leading to phosphorylation and degradation of Cdc25A, which enforces the G2/M checkpoint^[1][2]. The kinase exists as multiple isoforms, including Nek11L, Nek11S, Nek11C, and Nek11D, which exhibit distinct subcellular localization and differential impact on checkpoint control, with Nek11S showing the strongest effect^[1][2]. NEK11 activity is heightened in response to genotoxic stresses such as ionizing radiation and chemotherapeutic agents, promoting cell survival by coordinating DNA repair processes^[1][2][3]. In disease contexts, NEK11 overexpression is observed in colorectal and breast cancers, where its modulation influences cell proliferation and apoptosis, making it a potential therapeutic target^[1][4]. Compared with related NEK isoforms, NEK11 uniquely integrates S-phase and G2/M checkpoint signaling while maintaining nucleocytoplasmic shuttling regulated by its C-terminal domain^[2]. For experimental applications, NEK11 depletion via RNAi or expression of kinase-inactive mutants sensitizes cancer cells to DNA damage, enabling functional studies and preclinical exploration of targeted inhibitors^[1][2][3].