Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

High temporal resolution profiling of U2OS fibroblasts

ABSTRACT: High-temporal resolution profiling was performed on U2OS fibroblasts to detect rhythmic transcripts Keywords: time course Samples were collected every hour for 48 hours from dexamethasone-synchronized U2OS cells. Cells synchronized with dexamethasone for 24 hours, and harvested from the 24th to 71st hour. Samples were analyzed using Affymetrix arrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Michael Hughes

PROVIDER: E-GEOD-13949 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Harmonics of circadian gene transcription in mammals.

Hughes Michael E ME DiTacchio Luciano L Hayes Kevin R KR Vollmers Christopher C Pulivarthy S S Baggs Julie E JE Panda Satchidananda S Hogenesch John B JB

PLoS genetics 20090403 4

The circadian clock is a molecular and cellular oscillator found in most mammalian tissues that regulates rhythmic physiology and behavior. Numerous investigations have addressed the contribution of circadian rhythmicity to cellular, organ, and organismal physiology. We recently developed a method to look at transcriptional oscillations with unprecedented precision and accuracy using high-density time sampling. Here, we report a comparison of oscillating transcription from mouse liver, NIH3T3, a ...[more]

PMID: 19343201

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Project description:Regulation of organ size is important for development and tissue homeostasis. In Drosophila, Hippo signaling controls organ size by regulating the activity of a TEAD transcription factor, Scalloped, through modulation of its coactivator protein Yki. The role of mammalian Tead proteins in growth regulation, however, remains unknown. Here we examined the role of mouse Tead proteins in growth regulation. In NIH3T3 cells, cell density and Hippo signaling regulated the activity of Tead proteins by modulating nuclear localization of a Yki homologue, Yap, and the resulting change in Tead activity altered cell proliferation. Tead2-VP16 mimicked Yap overexpression, including increased cell proliferation, reduced cell death, promotion of EMT, lack of cell contact inhibition, and promotion of tumor formation. Growth promoting activities of various Yap mutants correlated with their Tead-coactivator activities. Tead2-VP16 and Yap regulated largely overlapping sets of genes. However, only a few of the Tead/Yapregulated genes in NIH3T3 cells were affected in Tead1-/-;Tead2-/- or Yap-/- embryos. Most of the previously identified Yap-regulated genes were not affected in NIH3T3 cells or mutant mice. In embryos, levels of nuclear Yap and Tead1 varied depending on cell types. Strong nuclear accumulation of Yap and Tead1 were seen in myocardium, correlating with requirements of Tead1 for proliferation. However, their distribution did not always correlate with proliferation. Taken together, mammalian Tead proteins regulate cell proliferation and contact inhibition as a transcriptional mediator of Hippo signaling, but the mechanisms by which Tead/Yap regulate cell proliferation differ depending on cell types, and Tead, Yap and Hippo signaling may play multiple roles in mouse embryos. We used microarrays to know the gene expression profiles regurated by Tead2-VP16, Tead2-EnR, Yap, and cell density in NIH3T3 cells. Keywords: Cell density, genetic modification Tead2-VP16-, Tead2-EnR-, Yap- and control vector-expressing cells were cultured at low or high density for RNA extraction and hybridization on Affymetrix microarrays.

Dataset Information

High temporal resolution profiling of U2OS fibroblasts

Publications

Harmonics of circadian gene transcription in mammals.

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