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Enhancer hijacking determines intra- and extrachromosomal circular MYCN amplicon architecture in neuroblastoma

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Item Type:Preprint
Title:Enhancer hijacking determines intra- and extrachromosomal circular MYCN amplicon architecture in neuroblastoma
Creators Name:Helmsauer, Konstantin and Valieva, Maria and Ali, S. and Gonzalez, R.C. and Schöpflin, R. and Röefzaad, C. and Bei, Y. and Garcia, H.D. and Rodriguez-Fos, E. and Puiggròs, M. and Kasack, K. and Haase, K. and Kuschel, L.P. and Euskirchen, P. and Heinrich, V. and Robson, M. and Rosswog, C. and Tödling, J. and Szymansky, A. and Hertwig, F. and Fischer, M. and Torrents, D. and Eggert, A. and Schulte, J.H. and Mundlos, S. and Henssen, A.G. and Koche, R.P.
Abstract:MYCN amplification drives one in six cases of neuroblastoma. The supernumerary gene copies are commonly found on highly rearranged, extrachromosomal circular DNA. The exact amplicon structure has not been described thus far and the functional relevance of its rearrangements is unknown. Here, we analyzed the MYCN amplicon structure and its chromatin landscape. This revealed two distinct classes of amplicons which explain the regulatory requirements for MYCN overexpression. The first class always co-amplified a proximal enhancer driven by the noradrenergic core regulatory circuit (CRC). The second class of MYCN amplicons was characterized by high structural complexity, lacked key local enhancers, and instead contained distal chromosomal fragments, which harbored CRC-driven enhancers. Thus, ectopic enhancer hijacking can compensate for the loss of local gene regulatory elements and explains a large component of the structural diversity observed in MYCN amplification.
Source:bioRxiv
Publisher:Cold Spring Harbor Laboratory Press
Article Number:2019.12.20.875807
Date:20 December 2019
Official Publication:https://doi.org/10.1101/2019.12.20.875807

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