{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTNRC6A is a member of the GW182 family that acts as an essential scaffolding protein in microRNA‐mediated gene silencing. It binds Argonaute proteins via its N‐terminal GW-repeat motifs and, in doing so, is recruited to miRNA targets where it bridges the core RISC (RNA-induced silencing complex) to downstream effector complexes. In its silencing domain, TNRC6A interacts with protein complexes such as CCR4–NOT and with the poly(A) binding protein, thereby promoting translational repression and triggering mRNA deadenylation. This function has been demonstrated by studies showing that tethered TNRC6A (or its isoform TNGW1) potently represses expression independent of Argonaute, emphasizing its central role in silencing."}, {"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 addition to its key cytoplasmic silencing activity, TNRC6A shuttles between the nucleus and cytoplasm through intrinsic nuclear localization and export signals. This nucleocytoplasmic trafficking not only enables it to participate in the formation and regulation of GW/P bodies—cytoplasmic foci that sequester and determine the fate of repressed mRNAs—but also facilitates the nuclear import of Argonaute proteins, thereby extending miRNA regulation to include nuclear gene expression processes. Its interactions, modulated by factors such as phosphorylation and binding partners, further contribute to the precise regulation of gene expression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTNRC6A function is also implicated in disease contexts. Frameshift mutations and loss of expression of TNRC6A have been observed in microsatellite instability–positive cancers, suggesting that disruption of its miRNA regulatory function contributes to tumorigenesis. In addition, dysregulation of TNRC6A by specific microRNAs has been linked to altered cellular proliferation and motility in malignancies such as non–small cell lung cancer. Studies comparing its three paralogs indicate that TNRC6A is largely functionally redundant with TNRC6B and TNRC6C, although it may assume unique roles in particular regulatory and therapeutic contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Songqing Li, Shang L Lian, Joanna J Moser, et al. 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