Data from Engineering and Functional Characterization of Fusion Genes Identifies Novel Oncogenic Drivers of Cancer
Hengyu LuNicole VillafañeTurgut DogrulukCaitlin L. GrzeskowiakKathleen KongYiu Huen TsangOksana ZagorodnaAngeliki PantaziLixing YangNicholas J. NeillYoung Won KimChad J. CreightonRoel G.W. VerhaakGordon B. MillsPeter J. ParkRaju KucherlapatiKenneth L. Scott
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<div>Abstract<p>Oncogenic gene fusions drive many human cancers, but tools to more quickly unravel their functional contributions are needed. Here we describe methodology permitting fusion gene construction for functional evaluation. Using this strategy, we engineered the known fusion oncogenes, <i>BCR-ABL1, EML4-ALK</i>, and <i>ETV6-NTRK3,</i> as well as 20 previously uncharacterized fusion genes identified in The Cancer Genome Atlas datasets. In addition to confirming oncogenic activity of the known fusion oncogenes engineered by our construction strategy, we validated five novel fusion genes involving <i>MET, NTRK2</i>, and <i>BRAF</i> kinases that exhibited potent transforming activity and conferred sensitivity to FDA-approved kinase inhibitors. Our fusion construction strategy also enabled domain-function studies of <i>BRAF</i> fusion genes. Our results confirmed other reports that the transforming activity of <i>BRAF</i> fusions results from truncation-mediated loss of inhibitory domains within the N-terminus of the BRAF protein. <i>BRAF</i> mutations residing within this inhibitory region may provide a means for BRAF activation in cancer, therefore we leveraged the modular design of our fusion gene construction methodology to screen N-terminal domain mutations discovered in tumors that are wild-type at the <i>BRAF</i> mutation hotspot, V600. We identified an oncogenic mutation, F247L, whose expression robustly activated the MAPK pathway and sensitized cells to BRAF and MEK inhibitors. When applied broadly, these tools will facilitate rapid fusion gene construction for subsequent functional characterization and translation into personalized treatment strategies. <i>Cancer Res; 77(13); 3502–12. ©2017 AACR</i>.</p></div>Keywords:
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