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There is ample support for developmental control of glioblastoma stem cells (GSCs), and a deeper knowledge of their epigenetic regulation could be central to more efficient glioblastoma (GBM) therapies. For this purpose, we analyzed the chromatin-accessibility landscape of nine mouse GSC cultures of defined cell of origin and 60 patient-derived GSC cultures by assay for transposase-accessible chromatin using sequencing (ATAC-seq). This uncovered an epigenetic variability of both mouse and human GSC cultures that differed from transcriptome clusters. Both mouse and human chromatin accessibility-guided clusters were predominantly determined by distal regulatory elements, displayed unique sets of transcription factor motif enrichment, and exhibited different functional and drug-response properties. Cross-species analysis of distal regulatory element regions in accessible chromatin of mouse and human cultures revealed conserved epigenetic regulation of GSCs.

ECOA-7. Conserved cell-lineage controlled chromatin accessibility in human and mouse glioblastoma stem cells predicts functionally distinct subgroups