ZIC4 is a sequence-specific DNA-binding transcription factor that regulates transcription through RNA polymerase II 1. In development, ZIC4 functions as a selector gene establishing dorsal domain identity in the trunk by converting BMP gradients into distinct spatial compartments within somites, with dosage-dependent effects on dorsal-specific traits including body shape and fin development 12. ZIC4 appears to function as a tumor suppressor in multiple cancer types. Epigenetic silencing of ZIC4 through EZH2-mediated H3K27me3 enrichment occurs in hepatocellular carcinoma and correlates with enhanced cell proliferation, migration, invasion, and epithelial-mesenchymal transition 3. Similarly, ZIC4 hypermethylation in pediatric choroid plexus carcinoma associates with adverse prognosis, and re-expression suppresses cell proliferation and migration while influencing immune response and metabolism pathways 4. Clinically, ZIC4 is notable in paraneoplastic syndromes. Autoantibodies against ZIC4 associate with paraneoplastic cerebellar degeneration, though testing for anti-ZIC4 antibodies produces high false-positive rates in clinical settings 56. ZIC4 dysfunction also shows genetic association with multiple system atrophy, with reduced ZIC4 expression observed in olivopontocerebellar atrophy patients, suggesting ZIC4-mediated neuronal vulnerability 7.