Abstract
In all, 85% of Ewing's sarcoma family tumors (ESFT), a neoplasm of unknown histogenesis, express EWS-FLI1 transcription factor gene fusions. To characterize direct target genes avoiding artificial model systems, we cloned genomic DNA from ESFT chromatin precipitating with EWS-FLI1. We now present a comprehensive list of 99 putative transcription factor targets identified, for the first time, by a hypothesis-free approach based on physical interaction. Gene-derived chromatin fragments co-precipitating with EWS-FLI1 were nonrandomly distributed over the human genome and localized predominantly to the upstream region and the first two introns of the genes. At least 20% of putative direct EWS-FLI1 targets were neural genes. One-third of genes recovered showed a significant ESFT-specific expression pattern and were found to be altered upon RNAi-mediated knockdown of EWS-FLI1. Among them, MK-STYX, encoding a MAP kinase phosphatase-like protein, was consistently expressed in ESFT. EWS-FLI1 was found to drive MK-STYX expression by binding to a single ETS binding motif within the first gene intron. MK-STYX serves as precedence for successful recovery of direct EWS-FLI1 targets from the authentic ESFT cellular context, the most relevant system to study oncogenic mechanisms for the discovery of new therapeutic targets in this disease.
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Acknowledgements
We thank Franz Watzinger and Lenka Baskova for help with real-time PCR. This study was supported in part by Grants 14299GEN and 16067-B04 from the Austrian Science Fund, by Grant GZ 200.071/3-VI/2a/2002 ‘GEN-AU Child’ from the Austrian Federal Ministry of Education, Science, and Culture, and Grant Po 529/5-1 from the Deutsche Forschungsgemeinschaft (DFG).
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Siligan, C., Ban, J., Bachmaier, R. et al. EWS-FLI1 target genes recovered from Ewing's sarcoma chromatin. Oncogene 24, 2512–2524 (2005). https://doi.org/10.1038/sj.onc.1208455
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DOI: https://doi.org/10.1038/sj.onc.1208455
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