Project description:This dataset consists of ATAC-seq data from human monocytes, monocyte-derived dendritic cells or monocyte-derived macrophages as well as monocyte-derived cells that were subjected to siRNA treatment targeting CTCF or RAD21. In total, it includes 39 samples.
Project description:ATAC-seq was performed to map changes in chromatin accessibility in monocytes during in vitro differentiation. In addition to control cells, we also studied the impact of siRNA mediated knock-down of key transcription factors on accessible chromatin in monocyte-derived dendritic cells.
Project description:This dataset consists of ChIP-seq data from human monocytes, monocyte-derived dendritic cells as well as monocyte-derived cells that were subjected to siRNA treatment targeting CTCF or RAD21. ChIP-sequencing was done for H3K27, RAD21 and CTCF. In total, the data set includes 120 samples.
Project description:Background: Interindividual differences in liver functions such as protein synthesis, lipid and carbohydrate metabolism and drug metabolism are influenced by epigenetic factors. The role of the epigenetic machinery in such processes has, however, been barely investigated. 5-hydroxymethylcytosine (5hmC) is a recently re-discovered epigenetic DNA modification that plays an important role in the control of gene expression. Results: In this study, we investigate 5hmC occurrence and genomic distribution in 8 fetal and 7 adult human liver samples in relation to ontogeny and function. LC-MS analysis shows that in the adult liver samples 5hmc comprises up to 1% of the total cytosine content, whereas in all fetal livers it is below 0.125%. Immunohistostaining of liver sections with a polyclonal anti-5hmC antibody shows that 5hmC is detected in most of the hepatocytes. Genome-wide mapping of the distribution of 5hmC in human liver samples by next-generation sequencing shows significant differences between fetal and adult livers. In adult livers, 5hmC occupancy is overrepresented in genes involved in active catabolic and metabolic processes, whereas 5hmC elements which are found in genes exclusively in fetal livers and disappear in the adult state, are more specific to pathways for differentiation and development. Conclusions: Our findings suggest that 5-hydroxymethylcytosine plays an important role in the development and function of the human liver and might be an important determinant for development of liver diseases as well as of the interindividual differences in drug metabolism and toxicity. 8 fetal and 7 adult human liver samples
Project description:ChIP-seq was performed to map transcription factor (TF) binding in monocytes during in vitro differentiation. To map binding sites for TF lacking suitable antibodies we also performed mRNA transfections using synthetic mRNAs translating into 3xFLAG TF versions that were ChIPed using Anti-Flag antibody.
Project description:Differential gene transcription enables development and homeostasis in all animals and is regulated by two major classes of distal cis-regulatory DNA elements (CREs), enhancers and silencers. While enhancers have been thoroughly characterized, the properties and mechansisms of silencers remain largely unknown. By an unbiased genome-wide functional screen in Drosophila melanogaster S2 cells, we discover a class of silencers that bind one of three transcription factors (TFs) and are generally not included in chromatin-defined CRE catalogs, as they mostly lack detectable DNA accessibility. The silencer-binding TF CG11247, which we term Saft, safeguards cell fate decisions in vivo and functions via a highly-conserved domain we term ZAC and the corepressor G9a, independently of G9a’s H3K9-methyltransferase activity. Overall, our identification of silencers with unexpected properties and mechanisms has important implications for the understanding and future study of repressive CREs, as well as the functional annotation of animal genomes.
Project description:Transcriptional profiles of naive, memory and TERM (early responder memory T cells) CD4+ T cells from control and LCMV memory mice.
Project description:DNA hydroxymethylation is frequently lost in glioblastoma. We hypothesized that reduced 5hmC levels might be related to the impaired expression of TET proteins in brain tumors. In this study we performed a genome-wide methylation analysis of LN229 cells stably transfected with scramble or TET3 overexpressing vectors. TET3 overexpression partially restored the genome-wide patterns of 5hmC characteristic of control brain samples in glioblastoma cell lines.
Project description:The link between global reductions in 5-hydroxymethylcytosine levels and cancer is well-known. In this study, we have characterized the extent and the location of 5hmC loss in brain tumors. We performed genome-wide methylation oxBS and BS analyses with the Illumina Infinium HumanMethylation450 BeadChip platform in 5 brain and 9 glioma samples and we measured the extent of 5mC and 5hmC in these normal versus tumoral conditions.