{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSS18 (historically known as SYT) is a highly conserved nuclear protein that functions as a transcriptional coactivator. In its native state, SS18 is an integral subunit of the mammalian SWI/SNF (or BAF) chromatin‐remodeling complexes where its conserved N‐terminal SNH domain mediates interactions with key ATPase subunits such as BRG1/BRM, and its C‐terminal QPGY region cooperates with coactivators like SIP/CoAA to facilitate hormone‐dependent transcription. Recent evidence also shows that SS18 regulates developmental transitions—including the conversion from pluripotency to differentiated somatic states—by forming nuclear condensates via its intrinsically disordered, tyrosine‐rich region, and that an unexpected pool of SS18 associates with the actin cytoskeleton to influence cell adhesion and spreading."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn synovial sarcoma, chromosomal translocations fuse the entire coding sequence of SS18 to one of the SSX genes, thereby generating chimeric oncoproteins (SS18‐SSX) that subvert the native function of SS18. These fusion proteins alter the normal composition and genomic targeting of the BAF complex—for example, by displacing tumor suppressor subunits such as BAF47 and redirecting the complex to loci like Sox2—as well as interfacing aberrantly with repressive polycomb machinery and oncogenic pathways (including Wnt and β‐catenin signaling). The resulting dominant‐negative effect disrupts regulated gene expression and contributes to cellular reprogramming and malignant transformation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "46"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCollectively, these studies underscore the dual faces of SS18 function. On one hand, its normal role in driving transcriptional programs and chromatin remodeling is essential for proper cellular differentiation and adhesion; on the other, its incorporation into oncogenic fusion proteins not only disrupts these critical processes but also reprograms the genome in a way that contributes to malignant transformation. The multifaceted nature of SS18—including its ability to form nuclear condensates and to interact with the actin cytoskeleton—highlights its importance as both a regulator of gene expression and a mediator of cellular architecture."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "24", "end_ref": "29"}, {"type": "fg_f", "ref": "32"}, {"type": "fg_f", "ref": "35"}, {"type": "fg_fs", "start_ref": "38", "end_ref": "46"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hiroyuki Kato, Agneta Tjernberg, Wenzhu Zhang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "SYT associates with human SNF/SWI complexes and the C-terminal region of its fusion partner SSX1 targets histones."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M108702200"}], "href": "https://doi.org/10.1074/jbc.M108702200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11734557"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11734557"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Ke Yang, Weng-Onn Lui, Yuntao Xie, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "The proto-oncoprotein SYT interacts with SYT-interacting protein/co-activator activator (SIP/CoAA), a human nuclear receptor co-activator with similarity to EWS and TLS/FUS family of proteins."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M502963200"}], "href": "https://doi.org/10.1074/jbc.M502963200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16227627"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16227627"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "D R H de Bruijn, A Geurts van Kessel "}, {"type": "b", "children": [{"type": "t", "text": "Common origin of the human synovial sarcoma associated SS18 and SS18L1 gene loci."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cytogenet Genome Res (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1159/000089874"}], "href": "https://doi.org/10.1159/000089874"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16484776"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16484776"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "D R H de Bruijn, A H A van Dijk, M P Willemse, et al. 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