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Gene expression induced by 5SA-Atoh1 in DLD1 cells

ABSTRACT: To investigate the function of Atoh1 in colon cancer cells. We have employed whole genome microarray expression profiling as a discovery platform to iedntify the gene expression induced by Atoh1 in colon cancer cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE37143 | GEO | 2012/04/11

SECONDARY ACCESSION(S): PRJNA158581

REPOSITORIES: GEO

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Gene expression induced by 5SA-Atoh1 in DLD1 cells

Project description:To investigate the function of Atoh1 in colon cancer cells. We have employed whole genome microarray expression profiling as a discovery platform to iedntify the gene expression induced by Atoh1 in colon cancer cells. Mutated Atoh1 (5SA-Atoh1) replaced 5 serine residues to Alanin for the protein stabilization were expressed in human colon cancer cellline; DLD1 cells. Triplicated RNAs were generated from GFP expressing DLD1 cells and 5SA-Atoh1 expressing DLD1 cell, respectively.

2012-04-10 | E-GEOD-37143 | biostudies-arrayexpress

Phospho-regulation of Atoh1 is required for plasticity of secretory progenitors and tissue regeneration [colon]

Project description:To define Atoh1 secretory signature, transcriptional profiling of secretory cells was performed. The expression profile of Atoh1+ cells from Atoh1(WT)CreERT2 R26RtdTom mice was determined by comparing tdTom+ (secretory) and tdTom- (absorptive) cells to define the baseline pro-secretory signature for both colon and small intestine (SI).

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Gene expression profile of colonic Atoh1+ve cells and their descendants in DSS-colitis mice

Project description:Atoh1 is the master transcription factor of secretory-type intestinal epithelial cells. By using a lineage-tracing model of Atoh1+ve cells, those Atoh1+ve epithelial cells and their descendants were collected from the colon of DSS-colitis mice or from the control mice, and subjected to global gene expression analysis.

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Evaluation of gene expression between CD44+ and CD44- cells in colonospheres

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Project description:To compare secretory signatures of wildtype and mutant mice, the transcription profiles of tdTom+ cells from Atoh1(WT)CreERT2 R26RtdTom and Atoh1(9S/T-A)CreERT2 R26RtdTom mice were generated. The profiles were obtained for both small intestine (SI) and colon.

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Regulation of gene expression by mir-493

Project description:To identify genes that are inhibited by mir-493, we have employed whole genome microarray expression profiling as a discovery platform to identify genes that are down-regulated after expression of mir-493. HCT116 colon cancer cells were transfected with control or mir-493 mimic for 24 hrs, and total RNA extracted from the transfected cells were labeled with Cy3 and used for microarray analyses with Agilent Whole Human Genome Oligo Microarrays.

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The Atoh1 targetome in murine postnatal cerebellum

Project description:A relatively small number of proneural transcription factors specify a multitude of neural progenitor populations in the developing mammalian brain. Despite their importance, little is known about their targets, cellular processes they regulate, or what genomic sites they occupy in vivo. We used an integrated experimental and computational approach, combining RNA-seq, Histone-seq, and Atoh1 ChIP-seq in cerebellar tissue, to identify over 600 targets of Atoh1, an important developmental transcription factor. We validated 10% of these targets and found that Atoh1 directly regulates genes involved not only in early proliferation but also later differentiation, migration, cell adhesion, metabolism, and cytoskeletal organization by recognizing a novel 10 nucleotide Atoh1 E-Box associated motif (AtEAM). This Atoh1 “targetome” is not only a resource for studies aimed at understanding the molecular mechanisms involved in cerebellar development, but our integrated approach provides a framework for future in vivo studies of transcription factors and their targetomes. Examination of RNA-seq WT and null expression data (2 reps each), 2 different histone modifications (2 rep each) and IgG control, and Atoh1 DNA-binding (2 reps each) and control in the developing cerebellum

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Project description:The functional unit of the inner ear consists of hair cells (HCs) and neurons in the inner ear. Both genes are induced early in development, but Atoh1 expression is counteracted by Neurog1. As a result, HC development is prevented during neurogenesis. This work aimed at understanding the molecular basis of this interaction. Atoh1 regulation depends on a 3’Atoh1-enhancer that is the site for Atoh1 autoregulation. This enhancer recapitulates Atoh1 expression in the embryo and contains putative binding sites for several transcription factors, including basic helix-loop-helix (bHLH) factors like Atoh1, Neurog1 and Hes/Hey repressors. Reporter assays on chick embryos and P19 cells show that Neurog1 hampers the autoactivation of Atoh1, the effect being cell autonomous and independent on Notch activity. ATAC-seq analysis shows that the region B of the 3’Atoh1-enhancer is accessible during development and sufficient for both activation and repression. Neurog1 requires the regions flanking the class A E-box bound by Atoh1 to show its repressor effect. However, Neurog1 does not require binding to DNA for Atoh1 repression and prevention of HC formation, but the dimerization domains Helix-1 and Helix-2. The repression of Atoh1 by Neurog1 does not involve the direct interaction between Atoh1 and Neurog1, but rather an indirect effect on the levels of Atoh1 protein. The results suggest that Neurog1 induces the acceleration of Atoh1 mRNA degradation and the consequent reduction of protein levels. Such a mechanism dissociates the prevention of Atoh1 expression in neuro-sensory progenitors from the unfolding of the neurogenic program.

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Regulation of gene expression by mir-493

2012-03-31 | E-GEOD-31751 | biostudies-arrayexpress