Combinatorial function of ETS transcription factors in the developing vasculature.
Members of the ETS family of transcription factors are among the first genes expressed in the developing vasculature, but loss-of-function experiments for individual ETS factors in mice have not uncovered important early functional roles for these genes. However, multiple ETS factors are expressed in spatially and temporally overlapping patterns in the developing vasculature, suggesting possible functional overlap. We have taken a comprehensive approach to exploring the function of these factors during vascular development by employing the genetic and experimental tools available in the zebrafish to analyze four ETS family members expressed together in the zebrafish vasculature; fli1, fli1b, ets1, and etsrp. We isolated and characterized an ENU-induced mutant with defects in trunk angiogenesis and positionally cloned the defective gene from this mutant, etsrp. Using the etsrp morpholinos targeting each of the four genes, we show that the four ETS factors function combinatorially during vascular and hematopoietic development. Reduction of etsrp or any of the other genes alone results in either partial or no defects in endothelial differentiation, while combined reduction in the function of all four genes causes dramatic loss of endothelial cells. Our results demonstrate that combinatorial ETS factor function is essential for early endothelial specification and differentiation.
Pham
Van N
VN
Laboratory of Molecular Genetics, National Institute of Child Health and Human Development/NIH, Building 6B, Room 309, 6 Center Drive, Bethesda, MD 20892, USA.
Lawson
Nathan D
ND
Mugford
Joshua W
JW
Dye
Louis
L
Castranova
Daniel
D
Lo
Brigid
B
Weinstein
Brant M
BM
D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D001808:Blood Vessels / Q000196:embryology* / Q000378:metabolism*; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D006410:Hematopoiesis / Q000235:genetics; D009024:Morphogenesis / Q000235:genetics; D009154:Mutation; D018919:Neovascularization, Physiologic / Q000235:genetics; D020319:Oligodeoxyribonucleotides, Antisense / Q000235:genetics; D050784:Proto-Oncogene Protein c-ets-1 / Q000235:genetics / Q000378:metabolism; D051789:Proto-Oncogene Protein c-fli-1 / Q000235:genetics / Q000378:metabolism; D050783:Proto-Oncogene Proteins c-ets / Q000235:genetics / Q000378:metabolism*; D015027:Zebrafish / Q000196:embryology* / Q000235:genetics / Q000378:metabolism*; D029961:Zebrafish Proteins / Q000235:genetics / Q000378:metabolism*
D017931:DNA Primers; C509408:Etv2 protein, zebrafish; D020319:Oligodeoxyribonucleotides, Antisense; D050784:Proto-Oncogene Protein c-ets-1; D051789:Proto-Oncogene Protein c-fli-1; D050783:Proto-Oncogene Proteins c-ets; D029961:Zebrafish Proteins