ZIC1 is a zinc finger transcription factor essential for central nervous system development, functioning as a transcriptional activator involved in cerebellar maturation, dorsal spinal cord development, and neurogenesis 1. During normal development, ZIC1 regulates neuronal progenitor proliferation-differentiation and cerebellar patterning through interactions with sonic hedgehog, retinoic acid, and TGFβ signaling pathways 1. ZIC1 also plays a critical role in vertebral skeletal stem cell (vSSC) biology, where it co-expresses with PAX1 to mediate vertebral bone formation and osteoblast generation 2. Clinically, ZIC1 exhibits context-dependent roles in disease. Heterozygous loss-of-function mutations associate with Dandy-Walker malformation, a cerebellar birth defect, while gain-of-function mutations cause coronal craniosynostosis 1. In cancer, ZIC1 demonstrates striking cell-of-origin specificity: it functions as a tumor suppressor in colorectal cancer (silenced via promoter hypermethylation) and group 4 medulloblastoma (loss-of-function events), suppressing proliferation and inducing apoptosis 34. Conversely, ZIC1 acts as an oncogenic driver in SHH medulloblastoma and promotes breast cancer metastasis through vSSC-derived MFGE8 secretion 42. In breast cancer, ZIC1 downregulation correlates with poor prognosis and associates with tumor progression 5. ZIC1 expression is epigenetically regulated through DNA and histone methylation 6.