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Establishment of transgenic lines to monitor and manipulate Yap/Taz-Tead activity in zebrafish reveals both evolutionarily conserved and divergent functions of the Hippo pathway. Mech Dev 2014 Aug;133:177-88

Date

02/25/2014

Pubmed ID

24560909

Pubmed Central ID

PMC4138299

DOI

10.1016/j.mod.2014.02.003

Scopus ID

2-s2.0-84908158843   30 Citations

Abstract

To investigate the role of Hippo pathway signaling during vertebrate development transgenic zebrafish lines were generated and validated to dynamically monitor and manipulate Yap/Taz-Tead activity. Spatial and temporal analysis of Yap/Taz-Tead activity suggested the importance of Hippo signaling during cardiac precursor migration and other developmental processes. When the transcriptional co-activators, Yap and Taz were restricted from interacting with DNA-binding Tead transcription factors through expression of a dominant negative transgene, cardiac precursors failed to migrate completely to the midline resulting in strong cardia bifida. Yap/Taz-Tead activity reporters also allowed us to investigate upstream and downstream factors known to regulate Hippo signaling output in Drosophila. While Crumbs mutations in Drosophila eye disc epithelia increase nuclear translocation and activity of Yorkie (the fly homolog of Yap/Taz), zebrafish crb2a mutants lacked nuclear Yap positive cells and down-regulated Yap/Taz-Tead activity reporters in the eye epithelia, despite the loss of apical-basal cell polarity in those cells. However, as an example of evolutionary conservation, the Tondu-domain containing protein Vestigial-like 4b (Vgll4b) was found to down-regulate endogenous Yap/Taz-Tead activity in the retinal pigment epithelium, similar to Drosophila Tgi in imaginal discs. In conclusion, the Yap/Taz-Tead activity reporters revealed the dynamics of Yap/Taz-Tead signaling and novel insights into Hippo pathway regulation for vertebrates. These studies highlight the utility of this transgenic tool-suite for ongoing analysis into the mechanisms of Hippo pathway regulation and the consequences of signaling output.

Author List

Miesfeld JB, Link BA

Author

Brian A. Link PhD Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Animals, Genetically Modified
Cell Movement
Evolution, Molecular
Gene Expression Regulation, Developmental
Genes, Reporter
Intracellular Signaling Peptides and Proteins
Membrane Proteins
Morphogenesis
Myocytes, Cardiac
Protein-Serine-Threonine Kinases
Retina
Trans-Activators
Zebrafish
Zebrafish Proteins
jenkins-FCD Prod-486 e3098984f26de787f5ecab75090d0a28e7f4f7c0