{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Brain cytoplasmic RNA 1 (BCYRN1), also known as BC200 RNA, is a neuron‐specific long noncoding RNA that under normal physiological conditions acts as a translational modulator at synapses through interactions with RNA‐binding proteins such as FMRP and hnRNPs, thereby fine‐tuning local protein synthesis (1,9). \n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In cancer, however, deregulation of BCYRN1 expression contributes to tumorigenesis in a context‐dependent manner. In several estrogen receptor–positive breast cancers, BCYRN1 is markedly upregulated and its increased expression correlates with enhanced cell motility, invasion and proliferation, suggesting an oncogenic role (1,2). Similarly, elevated levels of BCYRN1 have been associated with aggressive phenotypes in colorectal, prostate, gastric, hepatocellular, and non‐small cell lung cancers, where it functions by “sponging” specific microRNAs—such as miR‐204‐5p, miR‐939‐3p, and others—to derepress target oncogenes (e.g., HDAC11, cyclin E2) and activate key signaling pathways including PTEN/AKT/p21 and PI3K/AKT, thereby promoting proliferation, metastasis, and chemoresistance (2,4,5,6,7,8).\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In contrast, studies in glioma have revealed that BCYRN1 expression is significantly reduced, with lower levels correlating with tumor progression; in this context, restoration of BCYRN1 expression inhibits cell proliferation and migration via sequestering miR‐619‐5p to regulate targets such as CUEDC2 and modulate the PTEN/AKT/p21 pathway (3). \n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Overall, the multifaceted roles of BCYRN1—as a regulator of localized translation in neurons and as a context‐dependent modulator of oncogenic signaling through microRNA sponging in various cancers—highlight its potential as both a prognostic biomarker and a therapeutic target.\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n (1)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ", (2)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ", (3)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", (4)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ", (5)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", (6)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", (7)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", (8)"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", (9)."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Anna Iacoangeli, Yuan Lin, Eric J Morley, et al. 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