Post-transcriptional mechanisms contribute to Etv2 repression during vascular development
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Student Authors
John C. MooreUMass Chan Affiliations
Program in Gene Function and ExpressionDocument Type
Journal ArticlePublication Date
2013-09-11Keywords
Etv2Let-7
Endothelial
Angioblast
Zebrafish
Post-transcriptional regulation
MicroRNA
Developmental Biology
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Show full item recordAbstract
etv2 is an endothelial-specific ETS transcription factor that is essential for vascular differentiation and morphogenesis in vertebrates. While recent data suggest that Etv2 is dynamically regulated during vascular development, little is known about the mechanisms involved in this process. Here, we find that etv2 transcript and protein expression are highly dynamic during zebrafish vascular development, with both apparent during early somitogenesis and subsequently down-regulated as development proceeds. Inducible knockdown of Etv2 in zebrafish embryos prior to mid-somitogenesis stages, but not later, caused severe vascular defects, suggesting a specific role in early commitment of lateral mesoderm to the endothelial linage. Accordingly, Etv2-overexpressing cells showed an enhanced ability to commit to endothelial lineages in mosaic embryos. We further find that the etv2 3' untranslated region (UTR) is capable of repressing an endothelial autonomous transgene and contains binding sites for members of the let-7 family of microRNAs. Ectopic expression of let-7a could repress the etv2 3'UTR in sensor assays and was also able to block endogenous Etv2 protein expression, leading to concomitant reduction of endothelial genes. Finally, we observed that Etv2 protein levels persisted in maternal-zygotic dicer1 mutant embryos, suggesting that microRNAs contribute to its repression during vascular development. Taken together, our results suggest that etv2 acts during early development to specify endothelial lineages and is then down-regulated, in part through post-transcriptional repression by microRNAs, to allow normal vascular development.Source
Dev Biol. 2013 Sep 11. doi: 10.1016/j.ydbio.2013.08.028. [Epub ahead of print]DOI
10.1016/j.ydbio.2013.08.028Permanent Link to this Item
http://hdl.handle.net/20.500.14038/33310PubMed ID
24036310Related Resources
Link to article in PubMedae974a485f413a2113503eed53cd6c53
10.1016/j.ydbio.2013.08.028