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• W3109768283 abstract "Abstract Ependymoma is a tumor of the brain or spinal cord. The two most common and aggressive molecular groups of ependymoma are the supratentorial RELA-fusion associated group and the posterior fossa ependymoma group A. In both groups, tumors occur mainly in young children and frequently recur after treatment1. Although the molecular mechanisms underlying these diseases have recently been uncovered, they remain difficult to target and innovative therapeutic approaches are urgently needed. Here, we use genome-wide chromosome conformation capture (Hi-C), complemented with CTCF (insulators) and H3K27ac (active enhancers) ChIP-seq as well as gene expression and whole-genome DNA methylation profiling in primary and relapsed ependymoma tumors and cell lines to identify chromosomal rearrangements and regulatory mechanisms underlying aberrant expression of genes that are essential for ependymoma tumorigenesis. In particular, we observe the formation of new topologically associating domains (‘neo-TADs’) by intra- and inter-chromosomal structural variants, tumor-specific 3D chromatin complexes of regulatory elements, and the replacement of CTCF insulators by DNA hyper-methylation as novel oncogenic mechanisms in ependymoma. Through inhibition experiments we validated that the newly identified genes, including RCOR2, ITGA6, LAMC1, and ARL4C, are highly essential for the survival of patient-derived ependymoma models in a disease subtype-specific manner. Thus, this study identifies potential novel therapeutic vulnerabilities in ependymoma and extends our ability to reveal tumor-dependency genes and pathways by oncogenic 3D genome conformations even in tumors that lack known genetic alterations." @default.
• W3109768283 created "2020-12-07" @default.
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• W3109768283 date "2020-11-05" @default.
• W3109768283 modified "2023-10-16" @default.
• W3109768283 title "Oncogenic 3D genome conformations identify novel therapeutic targets in ependymoma" @default.
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• W3109768283 doi "https://doi.org/10.21203/rs.3.rs-88331/v1" @default.
• W3109768283 hasPublicationYear "2020" @default.
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