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Rearrangement bursts generate canonical gene fusions in bone and soft tissue tumors.


ABSTRACT: Sarcomas are cancers of the bone and soft tissue often defined by gene fusions. Ewing sarcoma involves fusions between EWSR1, a gene encoding an RNA binding protein, and E26 transformation-specific (ETS) transcription factors. We explored how and when EWSR1-ETS fusions arise by studying the whole genomes of Ewing sarcomas. In 52 of 124 (42%) of tumors, the fusion gene arises by a sudden burst of complex, loop-like rearrangements, a process called chromoplexy, rather than by simple reciprocal translocations. These loops always contained the disease-defining fusion at the center, but they disrupted multiple additional genes. The loops occurred preferentially in early replicating and transcriptionally active genomic regions. Similar loops forming canonical fusions were found in three other sarcoma types. Chromoplexy-generated fusions appear to be associated with an aggressive form of Ewing sarcoma. These loops arise early, giving rise to both primary and relapse Ewing sarcoma tumors, which can continue to evolve in parallel.

SUBMITTER: Anderson ND 

PROVIDER: S-EPMC6176908 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Rearrangement bursts generate canonical gene fusions in bone and soft tissue tumors.

Anderson Nathaniel D ND   de Borja Richard R   Young Matthew D MD   Fuligni Fabio F   Rosic Andrej A   Roberts Nicola D ND   Hajjar Simon S   Layeghifard Mehdi M   Novokmet Ana A   Kowalski Paul E PE   Anaka Matthew M   Davidson Scott S   Zarrei Mehdi M   Id Said Badr B   Schreiner L Christine LC   Marchand Remi R   Sitter Joseph J   Gokgoz Nalan N   Brunga Ledia L   Graham Garrett T GT   Fullam Anthony A   Pillay Nischalan N   Toretsky Jeffrey A JA   Yoshida Akihiko A   Shibata Tatsuhiro T   Metzler Markus M   Somers Gino R GR   Scherer Stephen W SW   Flanagan Adrienne M AM   Campbell Peter J PJ   Schiffman Joshua D JD   Shago Mary M   Alexandrov Ludmil B LB   Wunder Jay S JS   Andrulis Irene L IL   Malkin David D   Behjati Sam S   Shlien Adam A  

Science (New York, N.Y.) 20180801 6405


Sarcomas are cancers of the bone and soft tissue often defined by gene fusions. Ewing sarcoma involves fusions between <i>EWSR1</i>, a gene encoding an RNA binding protein, and E26 transformation-specific (ETS) transcription factors. We explored how and when <i>EWSR1-ETS</i> fusions arise by studying the whole genomes of Ewing sarcomas. In 52 of 124 (42%) of tumors, the fusion gene arises by a sudden burst of complex, loop-like rearrangements, a process called chromoplexy, rather than by simple  ...[more]

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