SKIL (SKI like proto-oncogene) encodes SnoN, a transcriptional corepressor that primarily functions as a negative regulator of TGF-β/SMAD signaling pathways 12. The protein inhibits TGF-β1-induced collagen synthesis and fibroblast activation by interacting with phosphorylated SMAD2 and SMAD3 in the cytoplasm, thereby attenuating fibrotic responses 1. SKIL expression is regulated post-transcriptionally through mRNA stabilization mechanisms involving m5C methylation by NSUN2 and YBX1 binding 3. In cancer contexts, SKIL exhibits oncogenic properties, promoting tumorigenesis through upregulation of the TAZ/autophagy axis, which facilitates immune escape and enhances invasive phenotypes 4. Mechanotransduction in triple-negative breast cancer activates a TGFβ/SKIL/TAZ signaling axis that supports invasive behavior 5. SKIL-activating rearrangements occur in approximately 1% of ETS-negative prostate cancers, where increased SKIL expression drives oncogenic transformation 6. The gene also shows associations with drug responses, including antipsychotic-induced QTc interval changes 7. These findings establish SKIL as a critical regulator of cellular responses to extracellular signals, with context-dependent roles in both tumor suppression and oncogenesis.