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<p>Synovial sarcoma (SyS) is an aggressive soft-tissue malignancy that is characterised by a pathognomonic t(X;18)(p11.2;q11.2) translocation, which produces the fusion oncogene named <i>SS18::SSX</i>. Despite recent advancements in our understanding of synovial sarcoma biology, the cell-of-origin remains undefined. A mesenchymal stromal cell (MSC) specific CreERT2 line was employed to express <i>SS18::SSX</i> in fibroblasts and related cell types, resulting in 100% penetrant synovial sarcoma development in mice, with a median latency period of 16.2 ± 2.8 weeks. Murine tumours exhibited high concordance with human synovial sarcoma subtypes at the histological and molecular levels. Genetic refinement of the cell-of-origin revealed that synovial sarcomas derive from a rare <i>Hic1</i><sup>+</sup> <i>Pdgfra</i><sup>+</sup> <i>Lgr5</i><sup>+</sup> fibroblastic population. Furthermore, comparative transcriptomic analysis revealed the acquisition of a transformed phenotype initiated by the loss of a mature fibroblastic profile and subsequent unmasking of an epigenetically embedded embryonic MSC program. Adult and embryonic MSCs exhibited overlapping H2AK119ub and H3K4me3/H3K27me3 (bivalent) histone marks, while SS18::SSX-mediated transformation culminated in the widespread loss of H3K27me3 at these genes and their consequent transcription. Collectively, these studies define a rare MSC context, conducive for SS18::SSX-mediated transformation, and demonstrate that SyS tumorigenesis involves the induction and maintenance of an embryonic-like MSC phenotype.</p>

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The fibroblast epigenome underlies SS18::SSX-mediated transformation in synovial sarcoma

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月2日

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  • Lesley A. Hill,
  • R. Wilder Scott,
  • Lauren A. Martin,
  • Martin Arostegui,
  • George Davenport,
  • Marcos Vemon,
  • Jakob Hofvander,
  • Xue Qi Wang,
  • Jinxiu Li,
  • Torsten O. Nielsen,
  • Kevin B. Jones,
  • Martin Hirst,
  • T. Michael Underhill

摘要

Synovial sarcoma (SyS) is an aggressive soft-tissue malignancy that is characterised by a pathognomonic t(X;18)(p11.2;q11.2) translocation, which produces the fusion oncogene named SS18::SSX. Despite recent advancements in our understanding of synovial sarcoma biology, the cell-of-origin remains undefined. A mesenchymal stromal cell (MSC) specific CreERT2 line was employed to express SS18::SSX in fibroblasts and related cell types, resulting in 100% penetrant synovial sarcoma development in mice, with a median latency period of 16.2 ± 2.8 weeks. Murine tumours exhibited high concordance with human synovial sarcoma subtypes at the histological and molecular levels. Genetic refinement of the cell-of-origin revealed that synovial sarcomas derive from a rare Hic1+ Pdgfra+ Lgr5+ fibroblastic population. Furthermore, comparative transcriptomic analysis revealed the acquisition of a transformed phenotype initiated by the loss of a mature fibroblastic profile and subsequent unmasking of an epigenetically embedded embryonic MSC program. Adult and embryonic MSCs exhibited overlapping H2AK119ub and H3K4me3/H3K27me3 (bivalent) histone marks, while SS18::SSX-mediated transformation culminated in the widespread loss of H3K27me3 at these genes and their consequent transcription. Collectively, these studies define a rare MSC context, conducive for SS18::SSX-mediated transformation, and demonstrate that SyS tumorigenesis involves the induction and maintenance of an embryonic-like MSC phenotype.