{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMIRLET7A1 is a key member of the evolutionarily conserved let‐7 microRNA family whose mature product functions as a potent tumor suppressor. It acts by repressing the translation of multiple oncogenes—including RAS, c‐Myc, HMGA2, E2F2, MYCN, and others—thereby inhibiting cellular proliferation, inducing cell‐cycle arrest, reducing cancer stem cell frequency, and curtailing metastatic potential in a variety of malignancies such as colon, gastric, lung, prostate, glioblastoma, and pituitary tumors. Reduced MIRLET7A1 levels, as demonstrated by studies in colon cancer and other tumor types, correlate with enhanced IL‐6–mediated inflammatory circuitry and increased resistance to apoptosis, thus promoting transformation and tumor progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMultiple studies have also elucidated the intricate regulatory network controlling MIRLET7A1 biogenesis. Its processing is tightly controlled by trans‐acting factors such as LIN28, hnRNP A1, Trim25, and even ADAR1‐mediated RNA editing, which either block or modulate its maturation from the precursor transcript. Structural and mechanistic investigations have shown that the binding of these proteins to the conserved terminal loop of the pre‐let‐7 transcript governs the balance between mature let‐7 production and its suppression, thus creating powerful double‐negative feedback loops with key regulators (for instance, LIN28 and H19) and enabling fine‐tuning of oncogenic pathways as well as cell‐cycle and senescence programs."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in tumor suppression and the regulation of oncogenic signaling, MIRLET7A1 also contributes to the modulation of immune responses, inflammation, metabolic reprogramming, and developmental cell‐fate decisions. In various contexts, let‐7 family members have been demonstrated to regulate toll‐like receptor expression during microbial infection, control cytokine levels (such as IL‐10 and IL‐13) in infectious and inflammatory diseases, and even influence cardiovascular function and neural differentiation. In addition, aberrant let‐7 activity, whether due to its sequestration by long noncoding RNAs like H19 or via deregulation by other miRNAs such as miR‐21, has been implicated in shifts in cellular metabolism—including enhanced aerobic glycolysis and reactive oxygen species production—that sensitize tumor cells to chemotherapeutic agents. Together, these studies underscore a multifaceted role for MIRLET7A1 in maintaining cellular homeostasis, balancing differentiation with self‐renewal, and modulating the tumor microenvironment."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "29", "end_ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yukihiro Akao, Yoshihito Nakagawa, Tomoki Naoe "}, {"type": "b", "children": [{"type": "t", "text": "let-7 microRNA functions as a potential growth suppressor in human colon cancer cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biol Pharm Bull (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1248/bpb.29.903"}], "href": "https://doi.org/10.1248/bpb.29.903"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16651716"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16651716"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Fanyin Meng, Roger Henson, Hania Wehbe-Janek, et al. 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