Multi-omics profiling visualizes dynamics of cardiac development and functions
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE213233 | GEO | 2023/01/13
REPOSITORIES: GEO
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Project description:Cardiogenesis is a tightly-regulated dynamic process through a continuum of differentiation and proliferation events. Transcriptional activation is the predominant early step for initiating cardiac formation in mammals. We then applied ChIP-seq analysis against histone modifications H3K4me1, H3K4me3, H3K27ac and RNAPol II in E10.5 mouse hearts to evaluate the instant activity of transcription factors, which is believed to serve as a powerful tool to study regulatory processes.
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Project description:Cardiogenesis involves multiple biological processes acting in concert during development, a coordination achieved by the regulation of diverse cardiac genes by a finite set of transcription factors (TFs). Previous work from our laboratory identified the roles of two Forkhead TFs, Checkpoint suppressor homologue (CHES-1-like) and Jumeau (Jumu) in governing cardiac progenitor cell divisions by regulating Polo kinase activity. These TFs were also implicated in the regulation of numerous other cardiac genes. Here we show that these two Forkhead TFs play an additional and mutually redundant role in specifying the cardiac mesoderm (CM): eliminating the functions of both CHES-1-like and jumu in the same embryo results in defective hearts with missing hemisegments. Our observations indicate that this process is mediated by the Forkhead TFs regulating the fibroblast growth factor receptor Heartless (Htl) and the Wnt receptor Frizzled (Fz), both previously known to function in cardiac progenitor specification: CHES-1-like and jumu exhibit synergistic genetic interactions with htl and fz in CM specification, thereby implying function through the same genetic pathways, and transcriptionally activate the expression of both receptor-encoding genes. Furthermore, ectopic overexpression of either htl or fz in the mesoderm partially rescues the defective CM specification phenotype seen in embryos doubly homozygous for mutations in jumu and CHES-1-like. Together, these data emphasize the functional redundancy that leads to robustness in the cardiac progenitor specification process mediated by Forkhead TFs regulating the expression of signaling pathway receptors, and illustrate the pleiotropic functions of this class of TFs in different aspects of cardiogenesis.
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2009-01-14 | E-GEOD-14411 | biostudies-arrayexpress
Project description:In this study, we identified a number of genes whose expression are regulated by the Hippo tumor suppressor pathway. To disrupt Hippo signaling in the mouse heart, we inactivated the single mammalian Salv ortholog using a Salv conditional null allele and the Nkx2.5 cre allele that directs cardiac cre activity. Total RNA from embryonic hearts were used for expression profiling of 17,455 unique genes. Genes transcriptionally regulated by the Hippo pathway during cardiogenesis were identifed through expression profiling of 17,455 unique genes in Salvador mutant (Salv CKO) embryonic hearts. Total RNA from E9.5-stage hearts were pooled into biological replicate samples (2 control and 2 Salv CKO) and were used to generate expression profiles.
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Project description:In this study, we identified a number of genes whose expression are regulated by the Hippo tumor suppressor pathway. To disrupt Hippo signaling in the mouse heart, we inactivated the single mammalian Salv ortholog using a Salv conditional null allele and the Nkx2.5 cre allele that directs cardiac cre activity. Total RNA from P8-stage hearts were used for expression profiling. Genes transcriptionally regulated by the Hippo pathway during cardiogenesis were identifed through expression profiling in Salvador mutant (Salv CKO) neontate hearts. Total RNA from postnatal day 8 (P8)-stage hearts was purified to generate biological replicate samples (2 control and 2 Salv CKO) and generate expression profiles. 3 technical replicates were used for each sample.
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