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Eomesodermin is a localized maternal determinant required for endoderm induction in zebrafish.

Christopher R R Bjornson·Kevin J P Griffin·Gist H Farr·Akira Terashima·Charis Himeda·Yutaka Kikuchi·David Kimelman
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Abstract

In zebrafish, endoderm induction occurs in marginal blastomeres and requires Casanova (Cas), the first endoderm-specific factor expressed in the embryo. Whereas the transcription factors Gata5 and Bon are necessary and sufficient for cas expression in marginal blastomeres, Bon and Gata5 are unable to induce cas in animal pole cells, suggesting that cas expression requires an additional, unidentified factor(s). Here, we show that cas expression depends upon the T box transcription factor Eomesodermin (Eomes), a maternal determinant that is localized to marginal blastomeres. Eomes synergizes potently with Bon and Gata5 to induce cas, even in animal pole blastomeres. We show that Eomes is required for endogenous endoderm induction, acting via an essential binding site in the cas promoter. Direct physical interactions between Eomes, Bon, and Gata5 suggest that Eomes promotes endoderm induction in marginal blastomeres by facilitating the assembly of a transcriptional activating complex on the cas promoter.

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AnimalsEmbryonic InductionEndodermGATA5 Transcription FactorGene Expression Regulation, DevelopmentalHigh Mobility Group ProteinsHomeodomain ProteinsIn Situ HybridizationNodal ProteinOligoribonucleotides, AntisensePromoter Regions, GeneticProtein BindingSOX Transcription FactorsT-Box Domain ProteinsTranscription FactorsTranscription, GeneticTransforming Growth Factor betaZebrafishZebrafish ProteinsJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.

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Christopher R R Bjornson, Kevin J P Griffin, Gist H Farr, Akira Terashima, Charis Himeda, Yutaka Kikuchi, David Kimelman. 2005. Eomesodermin is a localized maternal determinant required for endoderm induction in zebrafish.. https://doi.org/10.1016/j.devcel.2005.08.010

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