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Ewing sarcoma is driven by EWSR1::FLI1. KDM6A and KDM6B demethylases are key partners, with KDM6A recruiting BRG1 and KDM6B removing H3K27me3, offering new therapeutic targets.

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Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Ewing sarcoma is a bone and soft tissue cancer driven by the EWSR1::FLI1 oncoprotein.
  • EWSR1::FLI1 hijacks cell epigenetics, forming active enhancers crucial for tumor growth.
  • Targeting EWSR1::FLI1 cofactors is a promising therapeutic strategy.

Purpose of the Study:

  • To investigate the role of H3K27me3 demethylases KDM6A and KDM6B in EWSR1::FLI1-driven transcription.
  • To elucidate the specific functions of KDM6A and KDM6B in Ewing sarcoma pathogenesis.

Main Methods:

  • Expression of EWSR1::FLI1 in human pediatric mesenchymal stem cells.
  • Genome-wide analysis of H3K27me3 redistribution.
  • Assessing the impact of KDM6A and KDM6B inhibition on gene expression and tumor growth.

Main Results:

  • EWSR1::FLI1 expression caused genome-wide H3K27me3 redistribution.
  • KDM6A independently recruited BRG1 to enhancers with single GGAA motifs, essential for tumor growth.
  • KDM6B demethylated H3K27me3 at specific enhancers, colocalizing with BRG1 at GGAA repeats, and its loss impaired tumor xenograft growth.

Conclusions:

  • KDM6A and KDM6B are critical functional partners of EWSR1::FLI1.
  • These KDM6 demethylases exhibit distinct roles in regulating EWSR1::FLI1 transcriptional activity.
  • KDM6 demethylases represent potential therapeutic targets for Ewing sarcoma treatment.