DUSP6 (dual specificity phosphatase 6) is a protein phosphatase that primarily functions to negatively regulate MAPK signaling by dephosphorylating and inactivating ERK1/2 kinases 1. The protein exhibits dual specificity, targeting both tyrosine and serine/threonine residues on its substrates. DUSP6 plays critical roles in cellular signaling regulation, particularly in the ERK pathway, where its downregulation leads to increased ERK signaling and altered cellular excitability 1. In cancer contexts, DUSP6 functions as both a tumor suppressor and potential therapeutic target, with dual inactivation of DUSP4 and DUSP6 creating vulnerabilities in MAPK pathway-driven cancers 2. The gene also drives leukemic progression and mediates resistance to JAK2 inhibition through the DUSP6-RSK1 axis 3. In neurological contexts, DUSP6 inhibition can enhance and extend ketamine's antidepressant effects by augmenting synaptic plasticity through sustained ERK activity 4. Disease associations include congenital hypogonadotropic hypogonadism, where DUSP6 mutations contribute to oligogenic inheritance patterns 5. DUSP6 also regulates tumor microenvironment interactions, including macrophage polarization in colon cancer 6, highlighting its importance in both cancer biology and therapeutic interventions.