{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Long intergenic non‐coding RNA 689 (LINC00689) has emerged as a multifunctional regulatory RNA whose dysregulation is implicated in a spectrum of human diseases, particularly cancers. In glioma, for instance, elevated LINC00689 levels promote cell proliferation, migration, invasion, and enhanced glycolysis by functioning as a competing endogenous RNA (ceRNA) that sequesters microRNAs such as miR‑338‑3p and miR‑526b‑3p—thereby up‐regulating targets like PKM2 and IGF2BP1 to activate critical pathways including MAPK signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n In contrast, in colorectal cancer, LINC00689 is downregulated and appears to mediate tumor‐suppressive effects by sponging miR‑31‑5p, which leads to the upregulation of LATS2 and subsequent inhibition of proliferation, chemoresistance, and metastasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In gastric cancer, several studies have demonstrated that LINC00689 is overexpressed where it drives cancer progression by promoting cell growth, epithelial–mesenchymal transition (EMT) and inflammatory cytokine secretion. Mechanistically, LINC00689 acts as a ceRNA—either by binding miR‑338‑3p to derepress HOXA3 or by modulating miR‑526b‑3p to affect ADAM9 expression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n In osteosarcoma, upregulation of LINC00689 promotes tumor progression via the miR‑655/SOX18 axis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", while in triple‑negative breast cancer its tumor‑promoting role is mediated by sequestering miR‑142‑3p to enhance USP6NL expression, thereby facilitating cell migration, invasion, and EMT."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In prostate cancer, LINC00689 is upregulated and contributes to disease progression by sponging miR‑496, which in turn prevents the degradation of CTNNB1 and thereby activates the Wnt signaling pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n Beyond cancer, genetic studies have identified LINC00689 in the context of obesity, where variants nearby are significantly associated with the condition"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", and in neurodevelopmental disorders such as autism spectrum disorder, where its overexpression is observed."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Intriguingly, a regulatory variant in the 3′ untranslated region of the VIPR2 gene acts as a cis‑eQTL for LINC00689 in a tissue‑specific manner and has been linked to opioid addiction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Moreover, in uveal melanoma, LINC00689 has been identified as an enhancer RNA with independent prognostic value."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Finally, recent work has revealed that LINC00689 can also encode a functional micropeptide—STORM—which is induced by stress and TNF‑α via MST1‑mediated phosphorylation of eIF4E. This micropeptide competes with SRP19 for binding to 7SL RNA, thereby linking LINC00689 to the regulation of both mRNA and lncRNA translation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these studies underscore a context‑dependent role for LINC00689 that spans from acting as an oncogenic ceRNA in various cancers to contributing to metabolic and neuropsychological disorders, as well as participating in translational control through micropeptide production.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Xin Liu, Qiaojuan Zhu, Yang Guo, et al. 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