NTRK1 Fusion in Glioblastoma MultiformeReport as inadecuate




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Glioblastoma multiforme GBM is the most aggressive form of brain tumor, yet with no targeted therapy with substantial survival benefit. Recent studies on solid tumors showed that fusion genes often play driver roles and are promising targets for pharmaceutical intervention. To survey potential fusion genes in GBMs, we analysed RNA-Seq data from 162 GBM patients available through The Cancer Genome Atlas TCGA, and found that 3′ exons of neurotrophic tyrosine kinase receptor type 1 NTRK1, encoding TrkA are fused to 5′ exons of the genes that are highly expressed in neuronal tissues, neurofascin NFASC and brevican BCAN. The fusions preserved both the transmembrane and kinase domains of NTRK1 in frame. NTRK1 is a mediator of the pro-survival signaling of nerve growth factor NGF and is a known oncogene, found commonly altered in human cancer. While GBMs largely lacked NTRK1 expression, the fusion-positive GBMs expressed fusion transcripts in high abundance, and showed elevated NTRK1-pathway activity. Lentiviral transduction of the NFASC-NTRK1 fusion gene in NIH 3T3 cells increased proliferation in vitro, colony formation in soft agar, and tumor formation in mice, suggesting the possibility that the fusion contributed to the initiation or maintenance of the fusion-positive GBMs, and therefore may be a rational drug target.



Author: Jinkuk Kim , Yeri Lee , Hee-Jin Cho, Young-Eun Lee, Jaeyeol An, Gye-Hyun Cho, Young-Hyeh Ko, Kyeung Min Joo , Do-Hyun Nam

Source: http://plos.srce.hr/



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