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RING1B recruits EWSR1-FLI1 and cooperates in the remodeling of chromatin necessary for Ewing sarcoma tumorigenesis [RNA-seq]

ABSTRACT: Analysis of differential expression profiles of tumors wild-type and RING1B knock-down

ORGANISM(S): Homo sapiens

PROVIDER: GSE159525 | GEO | 2020/10/27

REPOSITORIES: GEO

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RING1B recruits EWSR1-FLI1 and cooperates in the remodelling of chromatin necessary for Ewing sarcoma tumorigenesis [microarray]

Project description:EWSR1-FLI1 genome reprogramming through remodeling of enhancers is determinant for Ewing sarcoma (ES) tumorigenesis. We describe a non-canonical function of RING1B, a PRC1 subunit highly expressed in primary ES tumors, co-localizing genome wide with EWSR1-FLI1 in active enhancers. While retaining its repressive canonical activity, we find RING1B as necessary for the expression of key EWSR1-FLI1 activated targets like NKX2-2, SOX2 or IGF1 where it mainly exerts a role in promoting oncogene recruitment to enhancers. Knockdown of RING1B is sufficient to impair growth of tumor xenografts and expression of EWSR1-FLI1 induced neomorphic enhancers in vivo. Restoration of RING1B ubiquitin ligase activity by the AURKB inhibitor AZD1152 decreases expression of RING1B/EWSR1-FLI1 common targets. Overall, our findings demonstrate RING1B as a critical modulator of EWSR1-FLI1 induced chromatin remodeling.

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