Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

SIRT1 and H1AcK26 promoter-association in mouse ES cells changes upon oxidative stress

ABSTRACT: Association of the (histone) deacetylase SIRT1 with promoters was assessed to determine putative SIRT1-regulated genes. Based on the observation that the SIRT1 yeast ortholog Sir2 redistributes across the yeast genome in repsonse to genotoxic stress and double strand breaks (DSBs), we investigated the impact of oxidative stress on the chromatin binding pattern of SIRT1. Oxidative stress causes a major change in SIRT1 binding that is accompanied by an inverse H1K26 acetylation pattern. H1K26 was shown to be a direct target for deacetylation by SIRT1. Keywords: ChIP-chip, stress response ES cells were left untreated or treated with 2 mM H2O2 for 1 hour. Both samples were subjected to ChIP against SIRT1, H1AcK26 or rabbit Ig (one IP per treatment and Ab). Input DNA was labeled with Cy3, IP DNA with Cy5, enrichment over input is reported as 2log.

ORGANISM(S): Mus musculus

SUBMITTER: David Sinclair

PROVIDER: E-GEOD-13075 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

SIRT1 redistribution on chromatin promotes genomic stability but alters gene expression during aging.

Oberdoerffer Philipp P Michan Shaday S McVay Michael M Mostoslavsky Raul R Vann James J Park Sang-Kyu SK Hartlerode Andrea A Stegmuller Judith J Hafner Angela A Loerch Patrick P Wright Sarah M SM Mills Kevin D KD Bonni Azad A Yankner Bruce A BA Scully Ralph R Prolla Tomas A TA Alt Frederick W FW Sinclair David A DA

Cell 20081101 5

Genomic instability and alterations in gene expression are hallmarks of eukaryotic aging. The yeast histone deacetylase Sir2 silences transcription and stabilizes repetitive DNA, but during aging or in response to a DNA break, the Sir complex relocalizes to sites of genomic instability, resulting in the desilencing of genes that cause sterility, a characteristic of yeast aging. Using embryonic stem cells, we show that mammalian Sir2, SIRT1, represses repetitive DNA and a functionally diverse set ...[more]

PMID: 19041753

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Project description:MarekM-bM-^@M-^Ys disease virus (MDV) is an oncovirus causing tumor disease known as MarekM-bM-^@M-^Ys disease (MD) in chicken. Breeding of chickens genetically resistant to MD is considered a vital augment to better control MD. To find the mechanism underlying the genetic resistance to MD, a genomic structural variation, copy number variation (CNV), was examined in inbred MD-resistant and -susceptible chicken lines by using the comparative genomic hybridization (CGH) technique. A total of 45 copy number variation regions (CNVRs) were found spanning across 3,297,038 bp in length of the chicken genome in 4 lines of chickens. Ten CNVRs were selectively confirmed with quantitative real-time PCR. The comparison between the resistant and susceptible chicken lines revealed 28 differentially presented CNVRs, which are functionally involved in immune response, cell proliferation in midbrain, G-protein coupled receptor signaling pathway, and protein-glutamine gamma-glutamyltransferase activity. Two CNVRs that are related with MD-resistance and M-bM-^@M-^Ssusceptibility were also found transmitted to descendent recombinant congenic lines that differ in susceptibility to MD. A positive correlation was identified between the CNVRs and gene expression, indicating the importance of gene expression dosage in disease resistance. We also found the overlapping between the CNVR region and the MarekM-bM-^@M-^Ys disease trait related quantitative trait loci (QTLs). In conclusion, our data provided additional information elucidating one of possible mechanisms underlying of genetic resistance to MD. The findings may eventually lead to better strategies for genetic improvement of resistance to MD in poultry. L63: highly resistant to MD; L72: highly susceptible to MD; RCS-L: moderate resistant to MD; RCS-M: moderate susceptible to MD Red blood cell DNAs were isolated from L63, L72, RCS-L and RCS-M and then labeled with Cy3. DNA from Red Junglefowl was labeled with Cy5 as reference and mixed with Cy3 labeled DNA, then hybridized to the 385K chicken tiling array. The hybridization, normalization and segmentation analysis were performed by NimbleGen Systems Inc. (Madison, USA). A detailed description of their technical specifics can be found on http://www.nimblegen.com/products/lit/lit.html. Briefly, the segments with five or more probes having a mean log2 ratio greater than M-BM-10.5 (0.5_5) were chosen as candidate CNVs.

Dataset Information

SIRT1 and H1AcK26 promoter-association in mouse ES cells changes upon oxidative stress

Publications

SIRT1 redistribution on chromatin promotes genomic stability but alters gene expression during aging.

Similar Datasets

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