NFATC2IP is a multifunctional protein with distinct roles in immune regulation and genome integrity. In T-helper 2 cells, NFATC2IP regulates NFAT-driven transcription of specific cytokine genes (IL3, IL4, IL5, IL13) by recruiting PRMT1 to enhance histone modifications at the IL4 promoter, facilitating robust cytokine expression 1. The protein contains tandem SUMO-like domains and serves as a key mediator of SUMO-dependent genomic stability by interacting with the SMC5/6 complex and UBC9; cells lacking NFATC2IP show hypersensitivity to SUMO E1 inhibition and accumulate mitotic chromosome 16 2. Beyond immunity, NFATC2IP modulates metabolic traits—DNA methylation at the NFATC2IP locus influences weight loss responses to dietary fat intake, with differential effects depending on fat consumption levels 3. In breast cancer, NFATC2IP phosphorylation by TRPV6-activated pathways enhances NFATC2 activity to promote metastasis via ADAMTS6 upregulation 4. Genetic variants at this locus show clinical associations with cardiovascular outcomes and cancer progression 56. Thus, NFATC2IP functions as a critical nexus integrating immune signaling, epigenetic regulation, and genome maintenance.