GSE115220
Etv6-dependent positive and negative gene regulatory network controls vegfa expression in vivo [RNA-seq]
VEGFA signaling is crucial for physiological and pathological angiogenesis and hematopoiesis. Although many context-dependent signaling pathways downstream of  VegfA have been uncovered, vegfa transcriptional regulation in vivo is unclear. Here, we show that ETS transcription factor Etv6 positively regulates vegfa expression during blood stem cell development through multiple transcriptional inputs. In agreement with its established repressive functions, Etv6 directly inhibits expression of vegfa repressor foxo3. Surprisingly, it also directly activates expression of vegfa activator klf4. Finally, it indirectly binds to vegfa promoter by the recruiment of Klf4. Thus, our work uncovers a dual function for Etv6, as both a transcriptional repressor and activator, in controlling a major signaling pathway. Overall design: RNA-seq was performed on three independent biological samples obtained from the somites of wild-type (WT) or etv6 morpholino injected stage 22 embryos. Indexed libraries were then generated, pooled and sequenced using a NextSeq 500 sequencer.