A single GATA factor plays discrete, lineage specific roles in ascidian heart development.
GATA family transcription factors are core components of the vertebrate heart gene network. GATA factors also contribute to heart formation indirectly through regulation of endoderm morphogenesis. However, the precise impact of GATA factors on vertebrate cardiogenesis is masked by functional redundancy within multiple lineages. Early heart specification in the invertebrate chordate Ciona intestinalis is similar to that of vertebrates but only one GATA factor, Ci-GATAa, is expressed in the heart progenitor cells and adjacent endoderm. Here we delineate precise, tissue specific contributions of GATAa to heart formation. Targeted repression of GATAa activity in the heart progenitors perturbs their transcriptional identity. Targeted repression of endodermal GATAa function disrupts endoderm morphogenesis. Subsequently, the bilateral heart progenitors fail to fuse at the ventral midline. The resulting phenotype is strikingly similar to cardia bifida, as observed in vertebrate embryos when endoderm morphogenesis is disturbed. These findings indicate that GATAa recapitulates cell-autonomous and non-cell-autonomous roles performed by multiple, redundant GATA factors in vertebrate cardiogenesis.
Molecular Cardiovascular Research Center, University of Arizona, Tucson, AZ 85724, USA.
Katerina
K
Ragkousi
Jeni
J
Beh
Sarah
S
Sweeney
Ella
E
Starobinska
Brad
B
Davidson
D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D019070:Cell Lineage / Q000235:genetics; D002465:Cell Movement; D049109:Cell Proliferation; D002938:Ciona intestinalis / Q000166:cytology / Q000196:embryology* / Q000235:genetics; D004707:Endoderm / Q000196:embryology / Q000378:metabolism; D050980:GATA Transcription Factors / Q000235:genetics / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D018390:Gene Targeting; D006321:Heart / Q000196:embryology*; D009024:Morphogenesis / Q000235:genetics; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism; D013997:Time Factors
D015415:Biomarkers; D050980:GATA Transcription Factors
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