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An ancestral Wnt-Brachyury feedback loop and vertebrate-specific recruitment of mesoderm-determining target genes revealed by comparative Brachyury target screens

ABSTRACT: Transcription factor brachyury plays a key role during mesoderm development in vertebrates. In this study we study study the effect of this transcription factor in diploblastic cnidarian model organism N. vectensis

ORGANISM(S): Nematostella vectensis

PROVIDER: GSE182573 | GEO | 2022/11/30

REPOSITORIES: GEO

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An ancestral Wnt-Brachyury feedback loop and vertebrate-specific recruitment of mesoderm-determining target genes revealed by comparative Brachyury target screens

Project description:Transcription factor brachyury plays a key role during mesoderm development in vertebrates. In this study we study study the effect of this transcription factor in the purple sea urchin S. purpuratus.

2022-08-01 | GSE198320 | GEO

BRACHYURY directs histone acetylation to target loci during mesoderm development.

Project description: Not available

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The molecular basis of specific functions of Brachyury and Eomes for mesoderm and endoderm lineage specification

Project description:The Tbx factors Eomesodermin (Eomes) and Brachyury instruct endoderm and mesoderm specification. Both Tbx factors have common large overlap in chromatin binding sites, however their embryonic phenotypes of mutants largely differ. In this study, we delineate the distinct binding patterns and gene target sets of Eomes and Brachyury providing a molecular model of distinct fate specification programs.

2023-07-26 | GSE194192 | GEO

Antagonistic BMP–cWNT signaling in the cnidarian Nematostella vectensis reveals insight into the evolution of mesoderm

Project description:Using forward transcriptomics, we show that beta-catenin/Tcf signaling and BMP2/4 signaling provide differential inputs into the cnidarian endomesodermal gene regulatory network (GRN) at the onset of gastrulation (24 h postfertilization) in N. vectensis. Surprisingly, beta-catenin/Tcf signaling and BMP2/4 signaling regulate a subset of common downstream target genes in the GRN in opposite ways, leading to the spatial and temporal differentiation of fields of cells in the developing embryo. Thus, we show that regulatory interactions between beta-catenin/Tcf signaling and BMP2/4 signaling are required for the specification and determination of different embryonic regions and the patterning of the oral?aboral axis in Nematostella.

2017-07-19 | GSE101604 | GEO

BRACHYURY orchestrates distinct mesoderm and endoderm gene regulatory networks in differentiating human embryonic stem cells

Project description:The transcription factor BRACHYURY (T, BRA) is one of the first markers of gastrulation and lineage specification in mammals. Despite its wide use and importance in stem cell and developmental biology, its genomic targets are largely unknown. Here, we used differentiated human embryonic stem cells to study the role of BRA in Bmp4-induced mesoderm and Activin-induced endoderm progenitors by ChIP-seq. We show that BRA has distinct genome-wide binding landscapes in these two populations. Our data illuminate the function of BRA in the context of human embryonic development and show that the regulatory role of BRA is context-dependent. ChIP-seq of BRACHYURY (T, BRA) in two cell types: endoderm and mesoderm progenitors derived from human embryonic stem cells after 36 hours of growth in chemically-defined media (described in Bernardo et al., Cell Stem Cell, 2011, 9:144-155). Input DNA samples are included as a control.

2015-05-18 | E-GEOD-60606 | biostudies-arrayexpress

Evolutionary conservation of the eumetazoan gene regulatory landscape

Project description:Bilaterian animals differ from other metazoans in their apparent bilateral symmetry and the development of a third germ layer. Both might have facilitated the evolution of the diverse and complex bilaterian body plans. The first cnidarian genome sequence revealed that despite their morphological simplicity, this sister group to all bilaterians shares an immense genomic complexity with vertebrates. This suggested that it might have been the complexity of gene regulation which increased during the evolution of bilaterians. We compared the gene regulatory landscape of cnidarians and bilaterians. To this end we generated the first genome-wide prediction of gene regulatory elements and profiled five epigenetic marks in a non-bilaterian animal, the cnidarian Nematostella vectensis. We found that the location of chromatin modifications relative to genes and distal enhancers is conserved among eumetazoans. Surprisingly, the genomic landscape of gene regulatory elements is highly similar between Nematostella and bilaterian model organisms. This suggests that complex regulation of developmental gene expression evolved in eumetazoans without a major increase in complexity in bilaterians. ChIP-seq of p300, RNA Pol2, and five histone modifications in Nematostella vectensis.

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Cnidarian cell type diversity revealed by whole-organism single-cell RNA-seq analysis

Project description:We performed single-cell transcriptome analysis (using MARS-seq) in the cnidarian Nematostella vectensis. Additionally we performed bulk ATAC-seq experiments on wild-type specimens, as well as ELAV::mOrange reporter transgenic lines (separating ELAV+ and ELAV- cell populations, representing neurons and non-neurons, respectively).

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Probing Brachyury Function during ES cell differentiaiton

Project description:To probe how Brachyury regulates its target genes, we performed mRNA-seq to analyze gene expression changes after Brachyury depletion by the lentivirus-mediated shRNA

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Map Brachyury-bound enhancers by ChIP-seq

Project description:To gain new mechanistic insights into highly-regulated lineage specification and morphogenetic processes during early embryogenesis, we applied ChIP-seq to identify transcriptional programs mediated by a key developmental regulator - Brachyury. Embryonic stem cells were differentiated into Brachyury-positive mesoendoderm cells. And, ChIP-seq experiments were carried out by two independent Brachyury antibodies.

2014-03-10 | E-GEOD-54978 | biostudies-arrayexpress

High-resolution Brachyury DNA-binding Sites Mapping by ChIP-exo

Project description:Mapping ultra high resolution of Brachyury:DNA interaction would provide us with valuable new mechanistic insights into complex molecular transactions at Brachyury-bound enhancers. Embryonic stem cells were differentiated into Brachyury-positive mesoendoderm cells. And, ChIP-exo experiment was then performed to identify detailed Brachyury-DNA binding profiles.

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