{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMIR9‐1, one of the genomic loci that gives rise to the mature microRNA‐9, plays a critical role in modulating inflammatory and stress‐response pathways. In immune cells, MIR9‐1 is induced in response to pathogen‐associated stimuli such as lipopolysaccharide via Toll‐like receptor (TLR) signaling and MyD88–NFκB activation. This induction sets in motion a negative feedback loop whereby the resultant miR‑9 targets key transcripts—for example, NFκB1—to fine‐tune the intensity of the inflammatory response and even modulate cellular radiosensitivity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer, the MIR9‐1–derived mature miR‑9 exerts multifaceted regulatory effects on tumor progression and metastasis. In several malignancies such as breast, esophageal, and colorectal cancers, miR‑9 directly targets genes that encode cell–cell adhesion molecules (for instance, E‑cadherin) and other regulators of epithelial–mesenchymal transition and cell motility. Such targeting not only facilitates enhanced migratory and invasive properties of cancer cells but also contributes to neoangiogenesis, as miR‑9 can influence downstream signaling cascades. Moreover, epigenetic silencing of MIR9‐1 through hypermethylation is associated with tumor aggressiveness and poor recurrence‐free survival in cancers like clear cell renal cell carcinoma and gastric cancer, underscoring its prognostic significance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in immune modulation and oncogenic processes, MIR9‐1 also influences neural biology and developmental programs. In neural progenitor cells, miR‑9 regulates the balance between proliferation and migration, thereby contributing to proper neurogenesis. Its function extends to the regulation of competing endogenous RNA networks and the coordination of neurovascular signaling—mechanisms that are vital both for normal brain development and in the pathogenesis of neurological disorders. These diverse roles highlight the context‐dependent functions of MIR9‐1 in controlling gene expression programs across various tissues."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Flavia Bazzoni, Marzia Rossato, Marco Fabbri, et al. 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