Genome-wide identification of notochord enhancers comprising the regulatory landscape of the Brachyury (T) locus in mouse
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PROVIDER: PRJNA984217 | ENA |
REPOSITORIES: ENA
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Project description:The node and notochord are important signaling centers organizing dorso-ventral patterning of cells arising from neuro-mesodermal progenitors forming the embryonic body anlage. Due to the scarcity of notochordal progenitors and notochord cells, a comprehensive identification of regulatory elements driving notochord-specific gene expression has been lacking. Here we have used ATAC-seq analysis of FACS-purified notochordal cells from TS12-13 mouse embryos to identify 8921 putative enhancers of notochordal cells. In addition, we established a new model for generating notochordal cells in culture, and identified 3728 enhancers occupied by the essential notochordal regulators Brachyury (T) and/or Foxa2. We describe the regulatory landscape of the T locus comprising 8 putative enhancers occupied by these factors and confirmed the regulatory activity of 3 of these elements. Moreover, we characterized one new notochord enhancer, termed TNE2, in embryos. TNE2 complements the loss of TNE in the trunk notochord, and is essential for notochordal cell proliferation and differentiation in the tail. Our data demonstrate the essential role of Foxa2 in the choice of T expressing cells between the notochordal fate and the NMP/mesodermal trajectory
2023-10-31 | GSE235030 | GEO
Project description:Genetic dissection of the mouse Brachyury locus identified a notochord enhancer and predicts additional control elements essential for trunk and tail development of the mouse embryo.
2021-11-26 | GSE179665 | GEO
Project description:A 37 kb region upstream of Brachyury comprising a notochord enhancer is essential for notochord and tail development
| PRJNA744512 | ENA
Project description:The key notochord transcription factor Brachyury was ectopically expressed in Ciona embryos under the control of the FoxAa cis-regulatory region (which drives expression in neural, endodermal and mesenchymal lineages in addition to notochord). Misexpression of Brachyury induced 925 genes compared to a control reporter plasmid (Bra>GFP). There was only modest overlap with a set of notochord-enriched genes previously identified by RNAseq of flow-sorted notochord cells, indicating that Brachyury is not a notochord master regulator gene as strictly defined.
2017-09-19 | GSE102142 | GEO
Project description:The notochord is a defining feature of the chordates. The transcription factor Brachyury (Bra) is a key regulator of notochord fate but here we show that it is not a unitary master regulator in the model chordate Ciona. Ectopic Bra expression only partially reprograms other cell types to a notochord-like transcriptional profile and a subset of notochord-enriched genes are unaffected by CRISPR Bra disruption. We identify Foxa.a and Mnx as potential co-regulators and find that combinatorial cocktails are more effective at reprograming other cell types than Bra alone. We reassess the network relationships between Foxa.a, and other components of the notochord gene regulatory network and find that Foxa.a expression in the notochord is regulated by vegetal FGF signaling. It is a direct activator of Bra expression and has a binding motif that is significantly enriched in the regulatory regions of notochord-enriched genes. These and other results indicate that Bra and Foxa.a act together in a regulatory network dominated by positive feed-forward interactions, with neither being a classically-defined master regulator.er
2020-10-31 | GSE160547 | GEO
Project description:The notochord is a defining feature of the chordates. The transcription factor Brachyury (Bra) is a key regulator of notochord fate but here we show that it is not a unitary master regulator in the model chordate Ciona. Ectopic Bra expression only partially reprograms other cell types to a notochord-like transcriptional profile and a subset of notochord-enriched genes are unaffected by CRISPR Bra disruption. We identify Foxa.a and Mnx as potential co-regulators and find that combinatorial cocktails are more effective at reprograming other cell types than Bra alone. We reassess the network relationships between Foxa.a, and other components of the notochord gene regulatory network and find that Foxa.a expression in the notochord is regulated by vegetal FGF signaling. It is a direct activator of Bra expression and has a binding motif that is significantly enriched in the regulatory regions of notochord-enriched genes. These and other results indicate that Bra and Foxa.a act together in a regulatory network dominated by positive feed-forward interactions, with neither being a classically-defined master regulator.er
2020-10-31 | GSE160546 | GEO
Project description:The notochord is a defining feature of the chordates. The transcription factor Brachyury (Bra) is a key regulator of notochord fate but here we show that it is not a unitary master regulator in the model chordate Ciona. Ectopic Bra expression only partially reprograms other cell types to a notochord-like transcriptional profile and a subset of notochord-enriched genes are unaffected by CRISPR Bra disruption. We identify Foxa.a and Mnx as potential co-regulators and find that combinatorial cocktails are more effective at reprograming other cell types than Bra alone. We reassess the network relationships between Foxa.a, and other components of the notochord gene regulatory network and find that Foxa.a expression in the notochord is regulated by vegetal FGF signaling. It is a direct activator of Bra expression and has a binding motif that is significantly enriched in the regulatory regions of notochord-enriched genes. These and other results indicate that Bra and Foxa.a act together in a regulatory network dominated by positive feed-forward interactions, with neither being a classically-defined master regulator.er
2020-10-31 | GSE160545 | GEO
Project description:The notochord is a defining feature of the chordates. The transcription factor Brachyury (Bra) is a key regulator of notochord fate but here we show that it is not a unitary master regulator in the model chordate Ciona. Ectopic Bra expression only partially reprograms other cell types to a notochord-like transcriptional profile and a subset of notochord-enriched genes are unaffected by CRISPR Bra disruption. We identify Foxa.a and Mnx as potential co-regulators and find that combinatorial cocktails are more effective at reprograming other cell types than Bra alone. We reassess the network relationships between Foxa.a, and other components of the notochord gene regulatory network and find that Foxa.a expression in the notochord is regulated by vegetal FGF signaling. It is a direct activator of Bra expression and has a binding motif that is significantly enriched in the regulatory regions of notochord-enriched genes. These and other results indicate that Bra and Foxa.a act together in a regulatory network dominated by positive feed-forward interactions, with neither being a classically-defined master regulator.
2020-10-31 | GSE160544 | GEO
Project description:The cell type-specific expression of key transcription factors is central to development and disease. Brachyury/T/TBXT is a major transcription factor for gastrulation, tailbud patterning, and notochord formation; however, how its expression is controlled in the mammalian notochord has remained elusive. Here, we identify the complement of notochord-specific enhancers in the mammalian Brachyury/T/TBXT gene. Using transgenic assays in zebrafish, axolotl, and mouse, we discover three conserved Brachyury-controlling notochord enhancers, T3, C, and I, in human, mouse, and marsupial genomes. Acting as Brachyury-responsive, auto-regulatory shadow enhancers, in cis deletion of all three enhancers in mouse abolishes Brachyury/T/Tbxt expression selectively in the notochord, causing specific trunk and neural tube defects without gastrulation or tailbud defects. The three Brachyury-driving notochord enhancers are conserved beyond mammals in the brachyury/tbxtb loci of fishes, dating their origin to the last common ancestor of jawed vertebrates. Our data define the vertebrate enhancers for Brachyury/T/TBXTB notochord expression through an auto-regulatory mechanism that conveys robustness and adaptability as ancient basis for axis development.
| S-EPMC10584899 | biostudies-literature
Project description:A genomic overview of in vivo binding of a transcription factor Brachyury in the ascidian gastrula embryo. Brachyury is known to be essential and sufficient for differentiation of the notochord. Keywords: ChIP-chip
2010-03-09 | GSE11925 | GEO