{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nZC4H2 is a zinc‐finger nuclear factor that plays a pivotal role in neural development, as evidenced by its strong association with a spectrum of neurodevelopmental disorders—including arthrogryposis multiplex congenita, intellectual disability, dystonia, and delayed motor development. Studies have shown that mutations or deletions in ZC4H2 disrupt normal neuromuscular and cognitive functions, reflecting its importance in both central and peripheral nervous system development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its intrinsic functions, ZC4H2 cooperates with the E3 ubiquitin ligase RNF220 to fine‐tune neural patterning. The RNF220/ZC4H2 complex targets key transcription factors—such as Dbx1/2, Nkx2.2, and Phox2a/Phox2b—for ubiquitin‐mediated modifications that are critical for establishing ventral progenitor domains, the differentiation of various interneurons and motor neurons, and the development of noradrenergic neurons in the locus coeruleus. This cooperation ensures proper protein stability and timely degradation, thereby regulating cell-fate decisions in the developing spinal cord."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "2", "end_ref": "5"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond neural development, ZC4H2 has been implicated in the modulation of signaling pathways that govern mesenchymal differentiation. By binding to and stabilizing Smad1 and Smad5, ZC4H2 promotes bone morphogenetic protein (BMP) signaling, which is essential for myogenic and osteogenic differentiation. Its loss not only disrupts neural stem cell proliferation and differentiation—via upregulation of key cell cycle regulators like Cend1—but also enhances osteoclast differentiation, leading to bone-development abnormalities and osteoporosis-like phenotypes. These findings highlight a broad regulatory spectrum where ZC4H2 influences both neural and skeletal tissue homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hiromi Hirata, Indrajit Nanda, Anne van Riesen, et al. 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