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ChIP-chip mapping of twist, dorsal, snail, weckle in Drosophila embryos

ABSTRACT: We performed ChIP-chip analysis using sheared chromatin isolated from Drosophila embryos of 1-3 hours in age. Keywords: high-resolution tiling array, drosophila, twist, dorsal, snail, weckle

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE26285 | GEO | 2011/02/28

SECONDARY ACCESSION(S): PRJNA135161

REPOSITORIES: GEO

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ChIP-chip mapping of twist, dorsal, snail, weckle in Drosophila embryos

Project description:We performed ChIP-chip analysis using sheared chromatin isolated from Drosophila embryos of 1-3 hours in age. Keywords: high-resolution tiling array, drosophila, twist, dorsal, snail, weckle ChIP-chip of twist, dorsal, snail, and weckle

2011-02-28 | E-GEOD-26285 | biostudies-arrayexpress

Chromatin immunoprecipitation of the dorsoventral determinants Dorsal, Twist and Snail in the Drosophila embryo

Project description:Genetic studies have identified numerous sequence-specific transcription factors that control development, yet little is known about their in vivo distribution across animal genomes. We determine the genome-wide occupancy of the dorsoventral determinants Dorsal, Twist and Snail in the Drosophila embryo using ChIP-chip analysis. There is a tight correlation between the limits of known enhancers and the in vivo binding of these proteins. The analysis predicts substantially more target genes than previously estimated, including Dpp signaling components and genes encoding anteroposterior segmentation determinants. Thus, the ChIP-chip data uncovers a much larger network, which integrates diverse patterning processes during development.

2007-08-31 | E-TABM-226 | biostudies-arrayexpress

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Drosophila melanogaster

Project description:ChIP-chip mapping of twist, dorsal, snail, weckle in Drosophila embryos

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Snail and Twist expression in HMLE and MCF10A cells

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In vivo transcriptional activation using CRISPR-Cas9 in Drosophila

Project description:Identifying putative transcription factor target genes by combining CRISPR/Cas9-based transcriptional activation with RNAseq in Drosophila S2R+ cells. This study focuses on the transcription factors Twist and Snail, singly and together. RNA from Drosophila cells following CRISPR/Cas9-based activation of Twist, Snail, or Twist and Snail together, compared with non-targeting sgRNA. Two biological replicates for each experiment

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Chromatin immunoprecipitation of Drosophila embryos to investigate RNA polymerase stalling at developmental control genes

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ChIP-Seq of six Drosophila species with anti-Drosophila melanogaster Twist and anti-Snail antibodies using different library fragment sizes

Project description:The binding patterns of some transcription factors have been shown to diverge substantially between closely related species. Here, we show that the binding pattern of the developmental transcription factor Twist is highly conserved across six Drosophila species, revealing strong functional constraints at developmental enhancers. Conserved binding correlates with sequence motifs for Twist and its partners, permitting the de novo discovery of their cooperative binding. It also includes over 10,000 low-occupancy sites near the detection limit, which tend to mark enhancers of later developmental stages. We predict that conservation, dynamic occupancy, and combinatorial regulation will be generally true for developmental enhancers.

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A Non-Canonical Raf Function Is Required for Dorsal-Ventral Patterning in Drosophila Embryogenesis

Project description:Embryonic development requires the establishment of directional axes. In Drosophila, spatially discrete expression of transcription factors determines the anterior to posterior organization of the early embryo, while the Toll and TGF-beta signalling pathways determine the early dorsal to ventral pattern. Embryonic MAPK/ERK signaling contributes to both anterior to posterior patterning in the terminal regions and to dorsal to ventral patterning during oogenesis and embryonic stages. Here we describe a novel loss of function mutation in the Raf kinase gene, which leads to loss of ventral cell fates as seen through the loss of the ventral furrow, the absence of Dorsal/NF-kB nuclear localization, the absence of mesoderm determinants Twist and Snail, and the expansion of TGF-beta. Gene expression analysis showed cells adopting ectodermal fates similar to loss of Toll signaling. Our results combine novel mutants, live imaging, optogenetics and transcriptomics to establish a novel role for Raf, that appears to be independent of the MAPK cascade, in embryonic patterning.

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