{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n ATOH8, a member of the basic helix‐loop‐helix transcription factor family, has emerged as a multifunctional regulator whose activity is highly context‐dependent. In the liver, ATOH8 is transcriptionally activated by the BMP/Smad pathway in response to iron fluctuations, thereby contributing to hepcidin regulation and systemic iron balance, with implications in anemia and β‐thalassemia."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In hepatocellular carcinoma, downregulation of ATOH8 correlates with enhanced stem cell features, chemoresistance, and tumorigenicity, indicating its role as a tumor suppressor by repressing key stemness‐associated genes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In mesenchymal contexts, ATOH8 promotes cell differentiation: its upregulation fosters chondrogenic differentiation of mesenchymal stem cells—a process that can be inhibited by lncRNA‐mediated epigenetic mechanisms"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "—and contributes to muscle regeneration by its expression in activated satellite cells."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition, ATOH8 functions in the vascular compartment as a downstream target of SMAD1/5, suggesting a role in endothelial differentiation and vascular development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Its role in cancer biology is further underscored by studies that describe distinct isoforms: one isoform acts as a fluid mechanosensor that, via activation of metabolic pathways such as HK2‐mediated glycolysis, supports the survival of circulating tumor cells"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", while another isoform (ATOH8‐V1) in breast cancer drives metastasis through direct transcriptional activation of pro‐metastatic genes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In endocrine and neural systems, ATOH8 modulates differentiation programs. Although it bears high similarity in its DNA‐binding domain to other pro‐differentiation factors, ATOH8 can serve as a weak activator or even an intrinsic repressor—modulating the activity of partners such as Neurogenin3 and E proteins in neuronal and pancreatic endocrine differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Its functional activity is further refined by interactions with regulatory proteins like the calcineurin subunit PPP3CB, which governs its nuclear localization and, consequently, its transcriptional output."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Finally, in retinal stem cells, ATOH8 modulates neurogenesis in response to growth/differentiation factors such as GDF5."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Overall, these diverse roles highlight ATOH8 as a key transcriptional mediator that integrates extracellular signals—ranging from iron levels and BMP activity to mechanical stress—to influence cellular differentiation, metabolism, and tissue homeostasis.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Léon Kautz, Delphine Meynard, Annabelle Monnier, et al. 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