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Adv."],"published-print":{"date-parts":[[2026,9,11]]},"abstract":"<jats:p>Neurodevelopmental disorders (NDDs), including autism spectrum disorder (ASD) and intellectual disability (ID), are genetically heterogeneous. DEAF1 has emerged as a key NDD risk gene, with pathogenic variants linked to DEAF1-associated neurodevelopmental disorder (DAND), but its role in human neurodevelopment remains unclear. Human cortical organoids (hCOs) provide a physiologically relevant model that recapitulates fetal brain development with an authentic human genetic background. Here, we show that a DEAF1 mutation in human embryonic stem cells disrupts chromatin accessibility at neuronal gene loci, leading to significant transcriptional alterations. In hCOs, this mutation results in aberrant progenitor proliferation, disrupted cortical lamination, and impaired neuronal differentiation. Furthermore, we identify WNT signaling, TGF\u03b2 superfamily signaling, and cell cycle regulation as commonly dysregulated pathways across multiple ASD-associated genetic perturbations. Pharmacological inhibition of WNT signaling with a Porcupine inhibitor partially rescues phenotypic defects in DEAF1-mutant hCOs. 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