ZIC2 is a zinc finger transcription factor that acts as both a transcriptional activator and repressor with critical roles in early CNS organogenesis 1. It regulates neural tube closure through molecular control mechanisms 1 and promotes progression toward human primed pluripotency by recruiting SWI/SNF chr13 remodeling complexes to primed-specific enhancers 2. ZIC2 drives ipsilateral retinal ganglion cell projection formation by activating SERT and EPHB1 expression, refining visual system connectivity. The gene is differentially regulated across pluripotent states: it is repressed by KLF17 during naive pluripotency maintenance 3 but essential for primed state maintenance 2. Pathogenic ZIC2 mutations cause Holoprosencephaly type 5 (HPE5), one of the most common genetic causes of this severe forebrain malformation 4. ZIC2-associated HPE results from defective ventral and dorsal forebrain patterning and characteristically produces non-craniofacial phenotypes distinct from other HPE subtypes 4. Mouse models of ZIC2 mutations have elucidated the cellular and molecular mechanisms underlying both classic and middle interhemispheric variant HPE 4. Beyond developmental contexts, elevated ZIC2 expression correlates with poor prognosis in clear cell renal carcinoma through FOXM1-mediated upregulation and subsequent activation of UBE2C/mTOR signaling 5.