Project description:The Hippo pathway regulates metazoan growth, acting through the transcriptional co-activators Yorkie (in Drosophila) and Yap and Taz (in vertebrates). Much attention has been focused on upstream regulators of Yorkie and its homologues. In contrast, the mechanisms by which they actually promote transcription have remained poorly understood. Genome-wide chromatin binding experiments support extensive functional overlap between Yorkie and GAF. Chromatin binding identifies thousands of Yorkie sites, the majority of which are associated with elevated transcription, based on genome-wide analysis of mRNA and histone H3K4Me3 modification. Our studies establish a molecular basis for transcriptional activation by Yorkie and implicate it as a global regulator of transcriptional activity in Drosophila.
Project description:The Hippo pathway regulates metazoan growth, acting through the transcriptional co-activators Yorkie (in Drosophila) and Yap and Taz (in vertebrates). Much attention has been focused on upstream regulators of Yorkie and its homologues. In contrast, the mechanisms by which they actually promote transcription have remained poorly understood. Genome-wide chromatin binding experiments support extensive functional overlap between Yorkie and GAF. Chromatin binding identifies thousands of Yorkie sites, the majority of which are associated with elevated transcription, based on genome-wide analysis of mRNA and histone H3K4Me3 modification. Our studies establish a molecular basis for transcriptional activation by Yorkie and implicate it as a global regulator of transcriptional activity in Drosophila.
Project description:The Hippo pathway regulates metazoan growth, acting through the transcriptional co-activators Yorkie (in Drosophila) and Yap and Taz (in vertebrates). Much attention has been focused on upstream regulators of Yorkie and its homologues. In contrast, the mechanisms by which they actually promote transcription have remained poorly understood. Genome-wide chromatin binding experiments support extensive functional overlap between Yorkie and GAF. Chromatin binding identifies thousands of Yorkie sites, the majority of which are associated with elevated transcription, based on genome-wide analysis of mRNA and histone H3K4Me3 modification. Our studies establish a molecular basis for transcriptional activation by Yorkie and implicate it as a global regulator of transcriptional activity in Drosophila. This is a dataset generated by the Drosophila Regulatory Elements modENCODE Project led by Kevin P. White at the University of Chicago. This dataset was generated in collaboration with Ken Irvine at HHMI/Rutgers University and Richard S. Mann at Columbia University. It contains ChIP-seq data (Illumina) for multiple transcription factor antibodies in Drosophila embryos and larval wing imaginal discs.
Project description:The Hippo pathway regulates metazoan growth, acting through the transcriptional co-activators Yorkie (in Drosophila) and Yap and Taz (in vertebrates). Much attention has been focused on upstream regulators of Yorkie and its homologues. In contrast, the mechanisms by which they actually promote transcription have remained poorly understood. Genome-wide chromatin binding experiments support extensive functional overlap between Yorkie and GAF. Chromatin binding identifies thousands of Yorkie sites, the majority of which are associated with elevated transcription, based on genome-wide analysis of mRNA and histone H3K4Me3 modification. Our studies establish a molecular basis for transcriptional activation by Yorkie and implicate it as a global regulator of transcriptional activity in Drosophila. This is a dataset generated by the Drosophila Regulatory Elements modENCODE Project led by Kevin P. White at the University of Chicago. This dataset was generated in collaboration with Ken Irvine at HHMI/Rutgers University and Richard S. Mann at Columbia University. It contains RNA-seq data for larval wing imaginal discs.
Project description:The transcription cofactor Yki drives growth and proliferation in part by controlling mitochondrial network formation. To determine if Yki and Sd are directly bound to DNA corresponding to mitochondrial genes, we used chromatin immunoprecipitation and whole genome tiling arrays (ChIP-chip) to identify regions bound by these factors in eye-antenna and wing imaginal discs. The supplementary .bed files contain all Yki or Sd binding sites (called at 5% FDR) in wing or eye-antenna imaginal discs, as well as shared Sd+Yki sites and associated target genes.
Project description:The transcription cofactor Yki drives growth and proliferation in part by controlling mitochondrial network formation. To determine if Yki and Sd are directly bound to DNA corresponding to mitochondrial genes, we used chromatin immunoprecipitation and whole genome tiling arrays (ChIP-chip) to identify regions bound by these factors in eye-antenna and wing imaginal discs. The supplementary .bed files contain all Yki or Sd binding sites (called at 5% FDR) in wing or eye-antenna imaginal discs, as well as shared Sd+Yki sites and associated target genes. Wing or eye-antenna imaginal discs ChIPped for Yki or Sd-GFP vs. input DNA from corresponding imaginal discs.
Project description:Several co-repressors interact directly with the DNA-binding protein CSL [Su(H) in Drosophila] and are proposed to keep target genes silenced in the absence of Notch activity. To investigate co-repressor activity in the context of this well defined signalling pathway, we analysed the genome-wide binding profile of the best-characterized CSL co-repressor in Drosophila, Hairless, in Kc cells and in wing imaginal discs. The binding profile in wing discs of a second CSL interacting repressor, SMRTER, was also analysed. There was significant overlap between Hairless and Su(H), both in Kc cells and in wing discs, where they were predominantly found in chromatin with active enhancer marks. The Hairless complex was widely present at some Notch regulated enhancers in the wing disc,but no binding was detected at others, indicating that it is not essential for silencing per se. Analysis of target enhancers confirmed differential requirements for Hairless. SMRTER binding significantly overlapped with Hairless, rather than complementing it, and many enhancers were apparently co-bound by both factors. Our analysis indicates that the actions of Hairless and SMRTER gate the enhancers to Notch activity and to Ecdysone signalling respectively, to ensure that the appropriate levels and timing of target gene expression are achieved.
Project description:We report the relationship between 'absent, small or homeotic discs 2' (ASH2) occupancy, histone modifications and the transcription machinery using the wing disc as a source of chromatin. Our results indicate that genes related to development and transcriptional regulation are direct targets of ASH2 and that this protein contributes to H3K4me3 of nearby nucleosomes. Moreover, ASH2 occupancy correlates with phosphorylated forms of RNA polymerase II and histone positive marks in active genes. RNA Pol II phosphorylation in Ser5 is reduced in ash2 mutants, indicating that ASH2 plays a role in promoter stalling.
Project description:The imaginal discs of Drosophila melanogaster, where most known Hedgehog (Hh) signaling target genes are expressed with a restricted pattern, offers an accessible model system for identifying novel targets of the Hh signaling pathway. In the wing discs, cells near the A/P compartment boundary (B: ptc+) receive the highest level of Hh stimulation, A cells (A: hh-) further from the border receive lower levels of stimulation, while P cells (P: hh+) do not respond to Hh. To identify target genes whose expression is controlled by Hh signaling activity, we performed a systematic comparison of gene expression profiles among the A cells (A: hh-), the A cells adjacent to the A/P compartment boundary (B: ptc+), and P cells (P: hh+) via microarray analysis.