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Genome-wide mapping of Tbx20 (GFP-tagged) in adult mouse whole heart

ABSTRACT: Tbx20 is a transcription factor important for heart development. To assess the role of Tbx20 in the adult heart, we sought to identify regulatory regions, gene targets and pathways regulated by this TF. To this end, we used chromatin immunoprecipitation (ChIP) of Tbx20 fused to GFP to locate binding sites in the genome of 8 weeks whole heart mouse tissue.

ORGANISM(S): Mus musculus

PROVIDER: GSE29636 | GEO | 2011/11/21

SECONDARY ACCESSION(S): PRJNA141343

REPOSITORIES: GEO

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Genome-wide mapping of Tbx20 (GFP-tagged) in adult mouse whole heart

Project description:Tbx20 is a transcription factor important for heart development. To assess the role of Tbx20 in the adult heart, we sought to identify regulatory regions, gene targets and pathways regulated by this TF. To this end, we used chromatin immunoprecipitation (ChIP) of Tbx20 fused to GFP to locate binding sites in the genome of 8 weeks whole heart mouse tissue. Analysis of 1 Tbx20-GFP ChIP sample of adult mouse whole heart against whole heart input

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The Tbx20-TLE Interaction is Essential for the Maintenance of the Second Heart Field

Project description:T-box transcription factor 20 (Tbx20) plays a multifaceted role in cardiac morphogenesis and controls a broad gene regulatory network. However, the mechanism by which Tbx20 activates and represses target genes in a tissue-specific and temporal manner remains unclear. Studies show that Tbx20 directly interacts with the Transducin-like Enhancer of Split (TLE) family of proteins to mediate transcriptional repression. However, a function for the Tbx20-TLE transcriptional repression complex during heart development has yet to be established. We created a mouse model with a two-amino acid substitution in the Tbx20 EH1 domain, thereby disrupting the Tbx20-TLE interaction. Disruption of this interaction impaired critical morphogenic events, including cardiac looping and chamber formation. Transcriptional profiling of Tbx20EH1Mut hearts and analysis of putative direct targets revealed misexpression of the retinoic acid pathway and cardiac progenitor genes. Further, we show that altered cardiac progenitor development and function contribute to the severe cardiac defects in our model. Our studies indicate that TLE-mediated repression is a primary mechanism by which Tbx20 controls gene expression.

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