{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPOU3F4 (also known as Brn4) is a member of the POU-domain transcription factor family with a central role in inner ear development. Expression studies in animal models reveal that POU3F4 is first detected in the mesenchyme of the developing otic capsule, where it orchestrates mesenchymal condensation and remodeling essential for the formation of the bony labyrinth. Disruption of its coding region—or its distant regulatory enhancers—leads to congenital X‐linked deafness (DFN3), which is characterized by inner ear malformations, abnormal air–bone gaps, and progressive sensorineural and conductive hearing loss. Functional analyses indicate that many disease‐causing mutations impair nuclear localization, DNA binding, and transcriptional activity, providing a molecular explanation for the characteristic clinical and radiological phenotypes observed in patients."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its pivotal function in auditory development, POU3F4 also participates in neural differentiation and cell fate specification. Investigations in neuronal precursor cells demonstrate that neurotrophic signals lead to rapid upregulation of POU3F4, an event that is associated with the transition from immature to differentiated neuronal states. This activity, in tandem with its broader expression in tissues such as the neural tube and pancreas, implies that POU3F4 helps mediate key developmental pathways that extend its influence well beyond the inner ear."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "26", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence also indicates that aberrant expression of POU3F4 can contribute to oncogenic cell plasticity. In particular, studies in prostate cancer models have shown that, when coexpressed with other proneural transcription factors such as ASCL1, POU3F4 aids the trans‐differentiation of adenocarcinoma cells into a neuroendocrine phenotype. 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