A genetic screen for vascular mutants in zebrafish reveals dynamic roles for Vegf/Plcg1 signaling during artery development
AuthorsCovassin, Laurence D.
Siekmann, Arndt F.
Kacergis, Michael C.
Moore, John C.
Villefranc, Jacques A.
Weinstein, Brant M.
Lawson, Nathan D.
UMass Chan AffiliationsDepartment of Biochemistry and Molecular Pharmacology
Program in Gene Function and Expression
Document TypeJournal Article
KeywordsAmino Acid Sequence
Animals, Genetically Modified
Molecular Sequence Data
Phospholipase C gamma
Sequence Homology, Amino Acid
Vascular Endothelial Growth Factor A
Genetics and Genomics
MetadataShow full item record
AbstractIn this work we describe a forward genetic approach to identify mutations that affect blood vessel development in the zebrafish. By applying a haploid screening strategy in a transgenic background that allows direct visualization of blood vessels, it was possible to identify several classes of mutant vascular phenotypes. Subsequent characterization of mutant lines revealed that defects in Vascular endothelial growth factor (Vegf) signaling specifically affected artery development. Comparison of phenotypes associated with different mutations within a functional zebrafish Vegf receptor-2 ortholog (referred to as kdr-like, kdrl) revealed surprisingly varied effects on vascular development. In parallel, we identified an allelic series of mutations in phospholipase c gamma 1 (plcg1). Together with in vivo structure-function analysis, our results suggest a requirement for Plcg1 catalytic activity downstream of receptor tyrosine kinases. We further find that embryos lacking both maternal and zygotic plcg1 display more severe defects in artery differentiation but are otherwise similar to zygotic mutants. Finally, we demonstrate through mosaic analysis that plcg1 functions autonomously in endothelial cells. Together our genetic analyses suggest that Vegf/Plcg1 signaling acts at multiple time points and in different signaling contexts to mediate distinct aspects of artery development.
SourceDev Biol. 2009 May 15;329(2):212-26. Epub 2009 Mar 6. Link to article on publisher's site
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/44105
Co-author John C. Moore is a student in the Interdisciplinary Graduate Program in the Graduate School of Biomedical Sciences (GSBS) at UMass Medical School.
Related ResourcesLink to Article in PubMed