Gene Set: RORIE_TARGETS_OF_EWSR1_FLI1_FUSION_DN

Standard name RORIE_TARGETS_OF_EWSR1_FLI1_FUSION_DN
Systematic name M15762
Brief description Neuroblastoma markers down-regulated in neuroblastoma cell lines expressing ESWR1-FLI1 [GeneID=2130;2313] fusion protein.
Full description or abstract Neuroblastoma (NB) and the Ewing sarcoma (ES)/peripheral primitive neuroectodermal tumor (PNET) family are pediatric cancers derived from neural crest cells. Although NBs display features of the sympathetic nervous system, ES/PNETs express markers consistent with parasympathetic differentiation. To examine the control of these differentiation markers, we generated NB x ES/PNET somatic cell hybrids. NB-specific markers were suppressed in the hybrids, whereas ES/PNET-specific markers were unaffected. These results suggested that the Ews/Fli-1 fusion gene, resulting from a translocation unique to ES/PNETs, might account for the loss of NB-specific markers. To test this hypothesis, we generated two different NB cell lines that stably expressed the Ews/Fli-1 gene. We observed that heterologous expression of the Ews/Fli-1 protein led to the suppression of NB-specific markers and de novo expression of ES/PNET markers. To determine the extent of changes in differentiation, we used the Affymetrix GeneChip Array system to observe global transcriptional changes of genes. This analysis revealed that the gene expression pattern of the Ews/Fli-1-expressing NB cells resembled that observed in pooled ES/PNET cell lines and differed significantly from the NB parental cells. Therefore, we propose that Ews/Fli-1 contributes to the etiology of ES/PNET by subverting the differentiation program of its neural crest precursor cell to a less differentiated and more proliferative state.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 14973077   Authors: Rorie CJ,Thomas VD,Chen P,Pierce HH,O'Bryan JP,Weissman BE
Exact source Table 4
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Organism Homo sapiens
Contributed by Kevin Vogelsang (MSigDB Team)
Source platform HUMAN_SEQ_ACCESSION
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Version history 3.0: Renamed from RORIE_ES_PNET_DN

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