DUSP14 (dual specificity phosphatase 14) is a negative regulator of MAPK signaling pathways that functions by dephosphorylating multiple kinases including ERK, JNK, and p38 MAP kinases 1. The protein plays crucial roles in immune regulation, particularly as a negative regulator of T-cell activation through dephosphorylation of TAK1 (MAP3K7) and its adapter TAB1 2. DUSP14 demonstrates protective effects against cellular stress and death pathways, notably by dephosphorylating MLKL to prevent cardiomyocyte necroptosis in hypothyroidism-induced heart failure 3 and by inhibiting TAK1-NF-κB signaling to reduce airway inflammation in allergic asthma 4. In cancer contexts, DUSP14 exhibits dual roles: it acts as a tumor suppressor that can be targeted by oncogenic microRNAs (miR-9 and miR-155) in breast cancer 5, yet paradoxically promotes triple-negative breast cancer progression by suppressing ferroptosis through the PTPN12-PPARα/SCD axis 6. The protein's activity is regulated by post-translational modifications, with methylation-induced ubiquitination enhancing its phosphatase activity 1. Genetic polymorphisms in DUSP14 influence immune responses and tuberculosis susceptibility, with certain variants associated with enhanced Th1 immunity and protection against active tuberculosis 7.