SKAP2 (src kinase associated phosphoprotein 2) is a cytosolic adapter protein that plays critical roles in immune cell function, male fertility, and cellular signaling. In immune cells, SKAP2 regulates neutrophil effector functions by acting downstream of CD11b/CD18 integrins, controlling actin rearrangements and clustering required for NADPH oxidase activity, phagocytosis, and cytotoxicity 1. SKAP2 also suppresses inflammation-mediated tumorigenesis by forming complexes with SHP-1 and SHP-2 phosphatases, attenuating TLR4-NF-κB signaling while promoting anti-inflammatory responses 2. The protein provides protection against bacterial infections, as SKAP2-deficient mice show impaired neutrophil ROS production and 100-fold higher bacterial burden during Klebsiella pneumoniae infection 3. In reproductive biology, SKAP2 is essential for sperm cytoskeletal structure and mitochondrial organization, with disruption causing abnormal sperm morphology and decreased motility 45. Additionally, SKAP2 exhibits protective functions in pancreatic β-cells by reducing cytokine-induced apoptosis through modulation of NF-κB signaling and ER stress pathways 6. The protein also regulates trophoblast growth and migration through the WAVE2-ARP2/3 signaling pathway, with downregulation associated with missed abortion 7.