DUSP12 (dual specificity phosphatase 12) is an atypical dual-specificity phosphatase that dephosphorylates both tyrosine and serine/threonine residues on target proteins 1. The protein contains a unique zinc-binding domain in addition to its catalytic domain, making it one of the largest DUSPs with strong nuclear expression 2. DUSP12 regulates multiple cellular processes including cell cycle progression, apoptosis protection, and stress responses. Mechanistically, DUSP12 interacts with and dephosphorylates ZPR9 at Ser143, promoting cell cycle progression and protecting cells from stress-induced apoptosis 1. In cardiac tissue, DUSP12 ameliorates pathological hypertrophy by inhibiting JNK1/2 activity, with decreased expression observed in hypertrophic hearts 3. The protein also regulates mTORC1/S6 signaling by blocking DUSP12-mediated dephosphorylation of p-S6 (S235/236) in cancer contexts 4. Disease relevance includes potential roles in systemic lupus erythematosus as a biomarker 5, cardiovascular protection through anti-inflammatory and anti-oxidative stress mechanisms 6, and oncogenic properties including increased cell motility and apoptosis resistance 7. DUSP12's nuclear interaction networks connect it to cytoskeletal regulation, chr1 modification, and ribosome maturation 2.