High-resolution structural genomics reveals new therapeutic vulnerabilities in glioblastoma
Michael J Johnston,
Florence MG Cavalli,
Franz J Zemp,
Michelle M Kushida,
Fiona J Coutinho,
Andrew J. Mungall,
Marco A. Marra,
Michael D Taylor,
Peter B Dirks,
Trevor J. Pugh,
Bradley St Croix,
Douglas J Mahoney,
Posted 13 Oct 2018
bioRxiv DOI: 10.1101/442277 (published DOI: 10.1101/gr.246520.118)
Posted 13 Oct 2018
We investigated the role of 3D genome architecture in instructing functional properties of glioblastoma stem cells (GSCs) by generating the highest-resolution 3D genome maps to-date for this cancer. Integration of DNA contact maps with chromatin and transcriptional profiles identified specific mechanisms of gene regulation, including individual physical interactions between regulatory regions and their target genes. Residing in structurally conserved regions in GSCs was CD276, a gene known to play a role in immuno-modulation. We show that, unexpectedly, CD276 is part of a stemness network in GSCs and can be targeted with an antibody-drug conjugate to curb self-renewal, a key stemness property. Our results demonstrate that integrated structural genomics datasets can be employed to rationally identify therapeutic vulnerabilities in self-renewing cells.
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