{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMiR‐449a has emerged as a multifunctional regulator in cancer where, in most contexts, it acts as a tumor suppressor. In a number of solid tumors—including prostate, bladder, lung, ovarian, endometrial, glioblastoma, breast, and nasopharyngeal carcinomas—its ectopic expression is associated with induction of cell‐cycle arrest, apoptosis, and senescence. Mechanistically, miR‐449a downregulates key cell‐cycle regulators and oncogenic drivers such as HDAC1, Cyclin D1, CDK6, CDC25A, and BCL2, as well as critical transcription factors including E2F1, MAZ, and CRIP2. In addition, miR‐449a has been shown to enhance the efficacy of ionizing radiation by promoting DNA damage, amplifying G2/M arrest through modulation of the pRb/E2F1 axis and c‐Myc, while in certain breast cancer settings its dysregulated overexpression may contribute to more aggressive behavior. Collectively, these studies highlight miR‐449a as a central mediator of oncogenic signaling and therapeutic responsiveness in a spectrum of malignancies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its role in tumor suppression, miR‐449a is a conserved regulator of cell differentiation and tissue morphogenesis. In multiciliated epithelia such as those lining the human airway, miR‐449a promotes centriole biogenesis and multiciliogenesis by directly inhibiting the Delta/Notch pathway. It also modulates differentiation processes in other tissues—including the intestinal epithelium and cartilage—by targeting key transcriptional regulators like LEF1, KLF4, and factors involved in chondrogenesis. These findings underscore a critical role for miR‐449a in coordinating complex developmental and regenerative programs."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "28", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in oncogenesis and differentiation, miR‐449a influences inflammatory, metabolic, and viral‐related processes. In the liver, diminished miR‐449a levels have been associated with enhanced hepatitis B virus replication and HCV‐mediated fibrogenesis via modulation of transcription factors such as CREB5, FXRα, and HNF4α that regulate inflammatory chemokine expression. Similarly, altered miR‐449a content in germ cells has been correlated with early life stress and may contribute to the intergenerational transmission of stress phenotypes. Furthermore, miR‐449a has been implicated in regulating osteogenic differentiation relevant to vascular calcification. 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