The ETS transcription factor ETV6 constrains the transcriptional activity of EWS–FLI to promote Ewing sarcoma

Author:

Lu Diana Y.,Ellegast Jana M.,Ross Kenneth N.,Malone Clare F.,Lin Shan,Mabe Nathaniel W.ORCID,Dharia Neekesh V.ORCID,Meyer Ashleigh,Conway Amy,Su Angela H.,Selich-Anderson Julia,Taslim Cenny,Byrum Andrea K.,Seong Bo Kyung A.,Adane Biniam,Gray Nathanael S.ORCID,Rivera Miguel N.,Lessnick Stephen L.ORCID,Stegmaier KimberlyORCID

Abstract

AbstractTranscription factors (TFs) are frequently mutated in cancer. Paediatric cancers exhibit few mutations genome-wide but frequently harbour sentinel mutations that affect TFs, which provides a context to precisely study the transcriptional circuits that support mutant TF-driven oncogenesis. A broadly relevant mechanism that has garnered intense focus involves the ability of mutant TFs to hijack wild-type lineage-specific TFs in self-reinforcing transcriptional circuits. However, it is not known whether this specific type of circuitry is equally crucial in all mutant TF-driven cancers. Here we describe an alternative yet central transcriptional mechanism that promotes Ewing sarcoma, wherein constraint, rather than reinforcement, of the activity of the fusion TF EWS–FLI supports cancer growth. We discover that ETV6 is a crucial TF dependency that is specific to this disease because it, counter-intuitively, represses the transcriptional output of EWS–FLI. This work discovers a previously undescribed transcriptional mechanism that promotes cancer.

Publisher

Springer Science and Business Media LLC

Subject

Cell Biology

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