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Enhancer of Zeste Homologue 2 (EZH2), a histone methyltransferase, is essential for the suppression of gene expression. However, the role of EZH2 in astrocyte early morphogenesis has remained unclear. Using an astrocyte\u2010specific Ezh2 knockout (cKO) mouse model, we examined the effects of EZH2 deletion on astrocyte morphogenesis, blood\u2013brain barrier (BBB) integrity and neurodevelopment. Loss of EZH2 led to increased glial fibrillary acidic protein (GFAP) expression, altered astrocyte morphology and reduced coverage of astrocytic endfeet on blood vessels, compromising BBB integrity. Vascular abnormalities, characterised by increased vascular density and smaller vessel diameter, mirrored compensatory changes seen in moyamoya disease. 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