{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe SKI oncoprotein is a multifunctional transcriptional regulator that primarily acts as a corepressor of transforming growth factor–β (TGF‑β) signaling by interacting with key Smad proteins. Structural studies have revealed that SKI engages the MH2 domain of Smad4 through a conserved interaction loop, thereby disrupting functional Smad complexes and suppressing TGF‑β, activin, and BMP responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": " This inhibitory capacity is fundamental for its roles in development and disease; for example, rare coding mutations or variants in SKI have been implicated in nonsyndromic cleft lip/palate and in Shprintzen–Goldberg syndrome, a connective tissue disorder with significant overlap with Marfan syndrome."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn cancer, aberrant SKI expression has been associated with both tumor‐promoting and –suppressing activities, depending on the cellular context. In melanoma, for instance, high levels of SKI correlate with enhanced cell proliferation, invasiveness, and a shift from tumor‐suppressive to oncogenic TGF‑β responses, partly by regulating Smad3 linker phosphorylation and c‑MYC stabilization."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}, {"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Similarly, in gastric, breast, and lung cancers, SKI overexpression—often resulting from gene amplification or failure of its TGF‑β–mediated degradation by factors such as Arkadia—attenuates TGF‑β–induced cytostasis, alters angiogenic balance, and suppresses p21 expression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "17"}]}, {"type": "t", "text": " In addition, SKI has been shown to interfere with p53 signaling, promoting its deacetylation through interactions with SIRT1 and enhancing MDM2 activity, which contributes to chemoresistance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSKI function is further fine‐tuned by its regulated expression and subcellular localization. It is subject to cell cycle–dependent proteasomal degradation and is dynamically phosphorylated by kinases such as cdc2/cyclinB and Akt, events that determine both its stability and its ability to interact with nuclear partners."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": " Moreover, microRNAs including miR‑29a, miR‑155, and miR‑1908 have emerged as important regulators of SKI expression in hematologic malignancies, melanoma, and even in fibrotic scar formation, respectively—underscoring the broader significance of post‐transcriptional control in SKI–mediated signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in cancer, SKI modulates diverse aspects of cellular differentiation and tissue development. It regulates Schwann cell proliferation and myelination, influences erythroid and myeloid differentiation by interacting with transcription factors such as GATA1 and PU.1, and is implicated in ocular morphogenesis as seen in anophthalmia/microphthalmia."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "25", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition, SKI is involved in cross‐talk between multiple signaling pathways. It not only represses canonical TGF‑β responses by maintaining a repressed basal state of target genes such as SMAD7"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "29"}]}, {"type": "t", "text": ", but also modulates other oncogenic and developmental pathways including the Wnt, Hippo, and BMP cascades through distinct protein–protein interactions—for example, through binding partners like FHL2 or by recruiting co-repressors such as HDAC3 via inhibition of Siah2."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "31", "end_ref": "33"}]}, {"type": "t", "text": " Furthermore, in non–small cell lung cancer and vascular endothelial cells, SKI suppresses TGF‑β–induced epithelial–mesenchymal and endothelial–mesenchymal transitions, thereby affecting metastasis and fibrogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCollectively, SKI functions as a pivotal regulator that integrates signals from multiple pathways by modulating transcriptional responses, cell proliferation, differentiation, and survival. Its dysregulation—whether by mutations, altered post‐translational modifications, or changes in expression level through microRNAs or proteolysis—not only disrupts TGF‑β homeostasis but also contributes to a spectrum of human pathologies including developmental malformations, fibrotic disorders, and various cancers."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}, {"type": "fg_fs", "start_ref": "36", "end_ref": "40"}]}, {"type": "t", "text": " This central role positions SKI as both a potential biomarker and a therapeutic target in diverse clinical settings.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have further expanded the repertoire of SKI’s interactions, such as its ability to sequester activated Smads in the cytoplasm by binding directly to the TGF‑β type I receptor"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "41"}]}, {"type": "t", "text": ", and its regulation of p53 activity through modulation of SIRT1 and sumoylation enzymes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": " In hematologic malignancies, loss of microRNA–mediated SKI regulation contributes to aberrant alternative splicing and chronic TGF‑β signaling"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "40"}]}, {"type": "t", "text": ", further underscoring the complexity of SKI’s role in normal cellular processes and disease.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAltogether, these findings from a broad spectrum of studies highlight SKI’s critical involvement in repressing TGF‑β signaling, regulating cell cycle dynamics and differentiation, and modulating oncogenic pathways. Its precise functions are governed by intricate regulatory mechanisms at the transcriptional and post‐translational levels, making it a key integrator in both developmental and disease-related contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}, {"type": "fg_f", "ref": "25"}, {"type": "fg_f", "ref": "20"}, {"type": "fg_fs", "start_ref": "7", "end_ref": "10"}, {"type": "fg_f", "ref": "28"}, {"type": "fg_f", "ref": "42"}, {"type": "fg_f", "ref": "31"}, {"type": "fg_f", "ref": "14"}, {"type": "fg_f", "ref": "12"}, {"type": "fg_f", "ref": "27"}, {"type": "fg_f", "ref": "29"}, {"type": "fg_f", "ref": "15"}, {"type": "fg_f", "ref": "13"}, {"type": "fg_f", "ref": "21"}, {"type": "fg_f", "ref": "16"}, {"type": "fg_f", "ref": "32"}, {"type": "fg_f", "ref": "39"}, {"type": "fg_f", "ref": "41"}, {"type": "fg_f", "ref": "43"}, {"type": "fg_f", "ref": "18"}, {"type": "fg_f", "ref": "23"}, {"type": "fg_f", "ref": "22"}, {"type": "fg_f", "ref": "19"}, {"type": "fg_fs", "start_ref": "36", "end_ref": "38"}, {"type": "fg_f", "ref": "11"}, {"type": "fg_f", "ref": "33"}, {"type": "fg_f", "ref": "24"}, {"type": "fg_f", "ref": "35"}, {"type": "fg_f", "ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jia Wei Wu, Ariel R Krawitz, Jijie Chai, et al. 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