Targeted degradation of BRD9 reverses oncogenic gene expression in synovial sarcoma

Brien, G. L., Remillard, D., Shi, J., Hemming, M. L., Chabon, J., Wynne, K., Dillon, E. T., Cagney, G., Van Mierlo, G., Baltissen, M. P., Vermeulen, M., Qi, J., Frohling, S., Gray, N. S., Bradner, J. E., Vakoc, C. R., Armstrong, S. A. (November 2018) Targeted degradation of BRD9 reverses oncogenic gene expression in synovial sarcoma. Elife, 7. ISSN 2050-084x

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URL: https://www.ncbi.nlm.nih.gov/pubmed/30431433
DOI: 10.7554/eLife.41305

Abstract

Synovial sarcoma tumours contain a characteristic fusion protein, SS18-SSX, which drives disease development. Targeting oncogenic fusion proteins presents an attractive therapeutic opportunity. However, SS18-SSX has proven intractable for therapeutic intervention. Using a domain-focused CRISPR screen we identified the bromodomain of BRD9 as a critical functional dependency in synovial sarcoma. BRD9 is a component of SS18-SSX containing BAF complexes in synovial sarcoma cells; and integration of BRD9 into these complexes is critical for cell growth. Moreover BRD9 and SS18-SSX co-localize extensively on the synovial sarcoma genome. Remarkably, synovial sarcoma cells are highly sensitive to a novel small molecule degrader of BRD9, while other sarcoma subtypes are unaffected. Degradation of BRD9 induces downregulation of oncogenic transcriptional programs and inhibits tumour progression in vivo. We demonstrate that BRD9 supports oncogenic mechanisms underlying the SS18-SSX fusion in synovial sarcoma and highlight targeted degradation of BRD9 as a potential therapeutic opportunity in this disease.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > BET bromodomain coactivator protein > Brd9
Investigative techniques and equipment > CRISPR-Cas9
diseases & disorders > cancer > cancer types > sarcoma
CSHL Authors:
Communities: CSHL labs > Vakoc lab
Depositing User: Matthew Dunn
Date: 15 November 2018
Date Deposited: 27 Nov 2018 17:07
Last Modified: 27 Nov 2018 17:07
Related URLs:
URI: http://repository.cshl.edu/id/eprint/37485

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