Nature Communications (Feb 2024)

ASPSCR1-TFE3 reprograms transcription by organizing enhancer loops around hexameric VCP/p97

  • Amir Pozner,
  • Li Li,
  • Shiv Prakash Verma,
  • Shuxin Wang,
  • Jared J. Barrott,
  • Mary L. Nelson,
  • Jamie S. E. Yu,
  • Gian Luca Negri,
  • Shane Colborne,
  • Christopher S. Hughes,
  • Ju-Fen Zhu,
  • Sydney L. Lambert,
  • Lara S. Carroll,
  • Kyllie Smith-Fry,
  • Michael G. Stewart,
  • Sarmishta Kannan,
  • Bodrie Jensen,
  • Cini M. John,
  • Saif Sikdar,
  • Hongrui Liu,
  • Ngoc Ha Dang,
  • Jennifer Bourdage,
  • Jinxiu Li,
  • Jeffery M. Vahrenkamp,
  • Katelyn L. Mortenson,
  • John S. Groundland,
  • Rosanna Wustrack,
  • Donna L. Senger,
  • Franz J. Zemp,
  • Douglas J. Mahoney,
  • Jason Gertz,
  • Xiaoyang Zhang,
  • Alexander J. Lazar,
  • Martin Hirst,
  • Gregg B. Morin,
  • Torsten O. Nielsen,
  • Peter S. Shen,
  • Kevin B. Jones

DOI
https://doi.org/10.1038/s41467-024-45280-5
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 21

Abstract

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Abstract The t(X,17) chromosomal translocation, generating the ASPSCR1::TFE3 fusion oncoprotein, is the singular genetic driver of alveolar soft part sarcoma (ASPS) and some Xp11-rearranged renal cell carcinomas (RCCs), frustrating efforts to identify therapeutic targets for these rare cancers. Here, proteomic analysis identifies VCP/p97, an AAA+ ATPase with known segregase function, as strongly enriched in co-immunoprecipitated nuclear complexes with ASPSCR1::TFE3. We demonstrate that VCP is a likely obligate co-factor of ASPSCR1::TFE3, one of the only such fusion oncoprotein co-factors identified in cancer biology. Specifically, VCP co-distributes with ASPSCR1::TFE3 across chromatin in association with enhancers genome-wide. VCP presence, its hexameric assembly, and its enzymatic function orchestrate the oncogenic transcriptional signature of ASPSCR1::TFE3, by facilitating assembly of higher-order chromatin conformation structures demonstrated by HiChIP. Finally, ASPSCR1::TFE3 and VCP demonstrate co-dependence for cancer cell proliferation and tumorigenesis in vitro and in ASPS and RCC mouse models, underscoring VCP’s potential as a novel therapeutic target.