FET fusion oncoproteins interact with BRD4 and SWI/SNF chromatin remodelling complex subtypes in sarcoma

Molecular Oncology

卷:16

Henrik Fagman¹  Anders Ståhlberg¹  Pierre Åman¹  Lisa Andersson¹  Ayman Osman¹  Tobias Österlund¹  Christoffer Vannas¹  Mandy Escobar¹  Malin Lindén¹ 

[1] Department of Laboratory Medicine Sahlgrenska Academy Sahlgrenska Center for Cancer Research Institute of Biomedicine University of Gothenburg Sweden;

关键词: BAF;    BRD4;    EWSR1‐FLI1;    FUS‐DDIT3;    Sarcoma;    SWI/SNF;   

DOI  :  10.1002/1878-0261.13195

来源: DOAJ

【 摘 要 】

FET fusion oncoproteins containing one of the FET (FUS, EWSR1, TAF15) family proteins juxtaposed to alternative transcription‐factor partners are characteristic of more than 20 types of sarcoma and leukaemia. FET oncoproteins bind to the SWI/SNF chromatin remodelling complex, which exists in three subtypes: cBAF, PBAF and GBAF/ncBAF. We used comprehensive biochemical analysis to characterize the interactions between FET oncoproteins, SWI/SNF complexes and the transcriptional coactivator BRD4. Here, we report that FET oncoproteins bind all three main SWI/SNF subtypes cBAF, PBAF and GBAF, and that FET oncoproteins interact indirectly with BRD4 via their shared interaction partner SWI/SNF. Furthermore, chromatin immunoprecipitation sequencing and proteomic analysis showed that FET oncoproteins, SWI/SNF components and BRD4 co‐localize on chromatin and interact with mediator and RNA Polymerase II. Our results provide a possible molecular mechanism for the FET‐fusion‐induced oncogenic transcriptional profiles and may lead to novel therapies targeting aberrant SWI/SNF complexes and/or BRD4 in FET‐fusion‐caused malignancies.

【 授权许可】

Unknown