Project description:The objective of the study is to profile histone H3 lysine nine di-methylation (H3K9me2) in Arabidopsis thaliana and to correlate it with DNA methylation.
Project description:The objective of the study is to profile histone H3 lysine nine di-methylation (H3K9me2) in Arabidopsis thaliana and to correlate it with DNA methylation. We constructed a high-resolution genome-wide map of H3K9me2 methylation by using native chromatin immunoprecipitation coupled with HD2 whole genome Nimblegen microarrays. Three replicas were performed for the native ChIP. As a control, one replica of ChIP isolated from crosslinked tissue was used.
Project description:Histone 3 lysine 4 and histone 3 lysine 9 methylation in wild type and ddm1 Arabidopsis thaliana seedlings. The purpose of the chromatin immunoprecipitation/microarray (ChIP/chip) experiment is to determine which regions of a genome are enriched for a particular histone modification in a single Arabidopsis thanliana genotype. Chromatin immunoprecipitation with antibodies raised against dimethyl histone-H3 lysine-9 (H3mK9) or dimethyl histone-H3 lysine-4 (H3mK4) is performed on a selected genotype. This purified DNA from each immunoprecipiation (mH3K9, mH3K4, no antibody control) is used for random amplification to increase the quantity of DNA for microarray hybridization. The amplified DNA from each experimental sample is then labeled with Cy5 and hybridized against total input DNA from the corresponding genotype, labeled in Cy3. In a single hybridization, the total input DNA serves as a baseline and is compared to the immunoprecipitated samples. Ratios of normalized signal intensities were calculated to identify enrichment of a particular sequence after immunoprecipitation, in comparison to the total input DNA. Dye swap analysis is carried out to take account of experimental variation by repeating the hybridization with identical samples labeled with Cy3 and Cy5, respectively. This SuperSeries is composed of the following subset Series: GSE1333: EV49+50, Histone 3 Lysine 4 methylation in wild-type Arabidopsis thaliana seedlings GSE1334: Histone 3 Lysine 4 methylation in ddm1 Arabidopsis thaliana seedlings GSE1335: EV104+105, Histone 3 Lysine 4 methylation in ddm1 Arabidopsis thaliana seedlings GSE1336: Ev106+107, Histone 3 Lysine 4 methylation in WT Arabidopsis thaliana seedlings GSE1337: EV51+52, Histone 3 Lysine 9 methylation in wild-type Arabidopsis thaliana seedlings GSE1338: EV59+60, Histone 3 Lysine 9 methylation in ddm1 Arabidopsis thaliana seedlings GSE1339: Histone 3 Lysine 9 methylation in wild-type Arabidopsis thaliana seedlings GSE1340: EV110+111, Histone 3 Lysine 9 methylation in ddm1 Arabidopsis thaliana seedlings Refer to individual Series
Project description:Analysis of Histone H3 Lysine 4 mono-, di- and trimethyl and the boundary protein CTCF in CD4+CD25+CD45RA+ regulatory T-cells and conventional CD4+CD25- T-cells. To investigate regulatory functions or potential new transcription start sites in Treg and Tconv cells, we investigated the associated histone modifications. Mono- and dimethylation of histone 3 lysin 4 (H3K4) were previously shown to mark enhancer regions, whereas H3K4 trimethylation generally associates with transcription start sites. At imprinted loci, binding of the insulator protein CTCF, which restricts or directs enhancer-promoter interactions, is often regulated by DNA-methylation. Therefore we performed ChIP-on-chip experiments (chromatin immunoprecipitation followed by microarray hybridization; samples were amplified with ligation mediated PCR [see label protocol for the procedure] prior to labeling) for mono- di- and trimethylation of histone 3 lysin 4 and of CTCF in expanded Treg and Tconv cells. Keywords: ChIP-on-chip ChIP-on-chip experiments for H3K4 mono-, di- and trimethyl and CTCF in CD4+CD25+CD45RA+ regulatory T-cells and conventional CD4+CD25- T-cells were co-hybridizied with the input. Three biologiacal replicates (rep1-3) were performed for every histone mark, two CTCF (rep1 and rep2).
Project description:We developed a stringent selection pipeline for lncRNA identification, combining high-throughput RNA sequencing and computational approaches. Using this pipeline, we annotated 1,353 lncRNAs in Arabidopsis thaliana. We further found that one fifth of the lncRNAs were associated with Polycomb repressive complex 2 (PRC2). Some PRC2-associated lncRNAs could repress the transcription of their neighboring genes through mediating histone H3 lysine 27 trimethylation.
Project description:Analysis of Histone H3 Lysine 4 mono-, di- and trimethyl and the boundary protein CTCF in CD4+CD25+CD45RA+ regulatory T-cells and conventional CD4+CD25- T-cells. To investigate regulatory functions or potential new transcription start sites in Treg and Tconv cells, we investigated the associated histone modifications. Mono- and dimethylation of histone 3 lysin 4 (H3K4) were previously shown to mark enhancer regions, whereas H3K4 trimethylation generally associates with transcription start sites. At imprinted loci, binding of the insulator protein CTCF, which restricts or directs enhancer-promoter interactions, is often regulated by DNA-methylation. Therefore we performed ChIP-on-chip experiments (chromatin immunoprecipitation followed by microarray hybridization; samples were amplified with ligation mediated PCR [see label protocol for the procedure] prior to labeling) for mono- di- and trimethylation of histone 3 lysin 4 and of CTCF in expanded Treg and Tconv cells. Keywords: ChIP-on-chip