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Title: SS18-SSX, the oncogenic fusion protein in synovial sarcoma, is a cellular context-dependent epigenetic modifier
Authors: Tamaki, Sakura
Fukuta, Makoto
Sekiguchi, Kazuya
Jin, Yonghui  kyouindb  KAKEN_id
Nagata, Sanae
Hayakawa, Kazuo
Hineno, Sho
Okamoto, Takeshi
Watanabe, Makoto
Woltjen, Knut  kyouindb  KAKEN_id  orcid (unconfirmed)
Ikeya, Makoto  kyouindb  KAKEN_id
Kato, Tomohisa
Toguchida, Junya  kyouindb  KAKEN_id
Author's alias: 玉置, さくら
池谷, 真
戸口田, 淳也
Issue Date: 16-Nov-2015
Publisher: Public Library of Science
Journal title: PLOS ONE
Volume: 10
Issue: 11
Thesis number: e0142991
Abstract: The prevalence and specificity of unique fusion oncogenes are high in a number of soft tissue sarcomas (STSs). The close relationship between fusion genes and clinicopathological features suggests that a correlation may exist between the function of fusion proteins and cellular context of the cell-of-origin of each tumor. However, most STSs are origin-unknown tumors and this issue has not yet been investigated in detail. In the present study, we examined the effects of the cellular context on the function of the synovial sarcoma (SS)-specific fusion protein, SS18-SSX, using human pluripotent stem cells (hPSCs) containing the drug-inducible SS18-SSX gene. We selected the neural crest cell (NCC) lineage for the first trial of this system, induced SS18-SSX at various differentiation stages from PSCs to NCC-derived mesenchymal stromal cells (MSCs), and compared its biological effects on each cell type. We found that the expression of FZD10, identified as an SS-specific gene, was induced by SS18-SSX at the PSC and NCC stages, but not at the MSC stage. This stage-specific induction of FZD10 correlated with stage-specific changes in histone marks associated with the FZD10 locus and also with the loss of the BAF47 protein, a member of the SWI/SNF chromatin-remodeling complex. Furthermore, the global gene expression profile of hPSC-derived NCCs was the closest to that of SS cell lines after the induction of SS18- SSX. These results clearly demonstrated that the cellular context is an important factor in the function of SS18-SSX as an epigenetic modifier.
Rights: © 2015 Tamakiet al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI(Published Version): 10.1371/journal.pone.0142991
PubMed ID: 26571495
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