A Genome-wide Chronological Study of Gene Expression and Two Histone Modifications, H3K4me3 and H3K9ac, during Developmental Leaf Senescence
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE67778 | GEO | 2015/04/11
SECONDARY ACCESSION(S): PRJNA280869
REPOSITORIES: GEO
Similar Datasets
Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series
2015-04-11 | E-GEOD-67778 | biostudies-arrayexpress
Project description:The genome-wide abundance of two histone modifications, H3K4me3 and H3K9ac, both associated with actively expressed genes, was monitored in Arabidopsis thaliana leaves at different time points during developmental senescence, along with expression in the form of RNA-seq data. H3K9ac and H3K4me3 marks were highly convergent at all stages of leaf aging, but H3K4me3 marks covered nearly twice the gene area as H3K9ac marks. Genes with the greatest fold-change in expression displayed the largest positively-correlated percent change in coverage for both marks. Most senescence up-regulated genes were pre-marked by H3K4me3 and H3K9ac, but at levels below the whole-genome average, and for these genes, gene expression increased without a significant increase in either histone mark. However, for a subset of genes showing increased or decreased expression, the respective gain or loss of H3K4me3 marks were found to closely match the temporal changes in mRNA abundance. 22% of genes that increased expression during senescence showed accompanying changes in H3K4me3 modification, and they include numerous regulatory genes, which may act as primary response genes.
2015-04-11 | GSE67777 | GEO
Project description:The genome-wide abundance of two histone modifications, H3K4me3 and H3K9ac, both associated with actively expressed genes, was monitored in Arabidopsis thaliana leaves at different time points during developmental senescence, along with expression in the form of RNA-seq data. H3K9ac and H3K4me3 marks were highly convergent at all stages of leaf aging, but H3K4me3 marks covered nearly twice the gene area as H3K9ac marks. Genes with the greatest fold-change in expression displayed the largest positively-correlated percent change in coverage for both marks. Most senescence up-regulated genes were pre-marked by H3K4me3 and H3K9ac, but at levels below the whole-genome average, and for these genes, gene expression increased without a significant increase in either histone mark. However, for a subset of genes showing increased or decreased expression, the respective gain or loss of H3K4me3 marks were found to closely match the temporal changes in mRNA abundance. 22% of genes that increased expression during senescence showed accompanying changes in H3K4me3 modification, and they include numerous regulatory genes, which may act as primary response genes.
2015-04-11 | GSE67776 | GEO
Project description:The genome-wide abundance of two histone modifications, H3K4me3 and H3K9ac, both associated with actively expressed genes, was monitored in Arabidopsis thaliana leaves at different time points during developmental senescence, along with expression in the form of RNA-seq data. H3K9ac and H3K4me3 marks were highly convergent at all stages of leaf aging, but H3K4me3 marks covered nearly twice the gene area as H3K9ac marks. Genes with the greatest fold-change in expression displayed the largest positively-correlated percent change in coverage for both marks. Most senescence up-regulated genes were pre-marked by H3K4me3 and H3K9ac, but at levels below the whole-genome average, and for these genes, gene expression increased without a significant increase in either histone mark. However, for a subset of genes showing increased or decreased expression, the respective gain or loss of H3K4me3 marks were found to closely match the temporal changes in mRNA abundance. 22% of genes that increased expression during senescence showed accompanying changes in H3K4me3 modification, and they include numerous regulatory genes, which may act as primary response genes. RNA-seq data at different stages of leaf aging.
2015-04-11 | E-GEOD-67777 | biostudies-arrayexpress
Project description:The genome-wide abundance of two histone modifications, H3K4me3 and H3K9ac, both associated with actively expressed genes, was monitored in Arabidopsis thaliana leaves at different time points during developmental senescence, along with expression in the form of RNA-seq data. H3K9ac and H3K4me3 marks were highly convergent at all stages of leaf aging, but H3K4me3 marks covered nearly twice the gene area as H3K9ac marks. Genes with the greatest fold-change in expression displayed the largest positively-correlated percent change in coverage for both marks. Most senescence up-regulated genes were pre-marked by H3K4me3 and H3K9ac, but at levels below the whole-genome average, and for these genes, gene expression increased without a significant increase in either histone mark. However, for a subset of genes showing increased or decreased expression, the respective gain or loss of H3K4me3 marks were found to closely match the temporal changes in mRNA abundance. 22% of genes that increased expression during senescence showed accompanying changes in H3K4me3 modification, and they include numerous regulatory genes, which may act as primary response genes. H3K4me3 and H3K9ac were measured on a genome-wide scale using ChIP-seq at different stages of leaf aging.
2015-04-11 | E-GEOD-67776 | biostudies-arrayexpress
Project description:While previous studies have shown that histone modifications could influence plant growth and development by regulating gene transcription, knowledge about the relationships between these modifications and gene expression is still limited. This study used chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-Seq), to investigate the genome-wide distribution of four histone modifications: di and trimethylation of H3K4 (H3K4me2 and H3K4me3) and acylation of H3K9 and H3K27 (H3K9ac and H3K27ac) in Oryza sativa L. japonica. By analyzing published DNase-Seq data, this study explored DNase-Hypersensitive (DH) sites along the rice genome. The histone marks appeared mainly in generic regions and were enriched around the transcription start sites (TSSs) of genes. This analysis demonstrated that the four histone modifications and the DH sites were all associated with active transcription. Furthermore, the four histone modifications were highly concurrent with transcript regions-a promising feature that was used to predict missing genes in the rice gene annotation. The predictions were further validated by experimentally confirming the transcription of two predicted missing genes. Moreover, a sequence motif analysis was constructed in order to identify the DH sites and many putative transcription factor binding sites.
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Project description:The aim of this study was to analyze the expression of peroxisome proliferator-activated receptor γ (PPARγ) and retinoid X receptor α (RxRα), a binding heterodimer playing a pivotal role in the successful trophoblast invasion, in the placental tissue of preeclamptic patients. Furthermore, we aimed to characterize a possible interaction between PPARγ and H3K4me3 (trimethylated lysine 4 of the histone H3), respectively H3K9ac (acetylated lysine 9 of the histone H3), to illuminate the role of histone modifications in a defective trophoblast invasion in preeclampsia (PE). Therefore, the expression of PPARγ and RxRα was analyzed in 26 PE and 25 control placentas by immunohistochemical peroxidase staining, as well as the co-expression with H3K4me3 and H3K9ac by double immunofluorescence staining. Further, the effect of a specific PPARγ-agonist (Ciglitazone) and PPARγ-antagonist (T0070907) on the histone modifications H3K9ac and H3K4me3 was analyzed in vitro. In PE placentas, we found a reduced expression of PPARγ and RxRα and a reduced co-expression with H3K4me3 and H3K9ac in the extravillous trophoblast (EVT). Furthermore, with the PPARγ-antagonist treated human villous trophoblast (HVT) cells and primary isolated EVT cells showed higher levels of the histone modification proteins whereas treatment with the PPARγ-agonist reduced respective histone modifications. Our results show that the stimulation of PPARγ-activity leads to a reduction of H3K4me3 and H3K9ac in trophoblast cells, but paradoxically decreases the nuclear PPARγ expression. As the importance of PPARγ, being involved in a successful trophoblast invasion has already been investigated, our results reveal a pathophysiologic connection between PPARγ and the epigenetic modulation via H3K4me3 and H3K9ac in PE.
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Project description:The plastid-nucleus located protein WHIRLY1 has been described as an upstream regulator of leaf senescence, binding to the promoter of senescence-associated genes like HvS40. To investigate the impact of WHIRLY1 on drought stress-induced, premature senescence, transgenic barley plants with an RNAi-mediated knockdown of the HvWHIRLY1 gene were grown under normal and drought stress conditions. The course of leaf senescence in these lines was monitored by physiological parameters and studies on the expression of senescence- and drought stress-related genes. Drought treatment accelerated leaf senescence in WT plants, whereas WHIRLY 1 knockdown lines (RNAi-W1) showed a stay-green phenotype. Expression of both senescence-associated and drought stress-responsive genes, was delayed in the transgenic plants. Notably, expression of transcription factors of the WRKY and NAC families, which are known to function in senescence- and stress-related signaling pathways, was affected in plants with impaired accumulation of WHIRLY1, indicating that WHIRLY1 acts as an upstream regulator of drought stress-induced senescence. To reveal the epigenetic indexing of HvS40 at the onset of drought-induced senescence in WT and RNAi-W1 lines, stress-responsive loading with histone modifications of promoter and coding sequences of HvS40 was analyzed by chromatin immunoprecipitation and quantified by qRT-PCR. In the wildtype, the euchromatic mark H3K9ac of the HvS40 gene was low under control conditions and was established in response to drought treatment, indicating the action of epigenetic mechanisms in response to drought stress. However, drought stress caused no significant increase in H3K9ac in plants impaired in accumulation of WHIRLY1. The results show that WHIRLY1 knockdown sets in motion a delay in senescence that involves all aspects of gene expression, including changes in chromatin structure.
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Project description:Recognition and repair of damaged DNA occurs within the context of chromatin. The key protein components of chromatin are histones, whose post-translational modifications control diverse chromatin functions. Here, we report our findings from a large-scale screen for DNA-damage-responsive histone modifications in human cells. We have identified specific phosphorylations and acetylations on histone H3 that decrease in response to DNA damage. Significantly, we find that DNA-damage-induced changes in H3S10p, H3S28p and H3.3S31p are a consequence of cell-cycle re-positioning rather than DNA damage per se. In contrast, H3K9Ac and H3K56Ac, a mark previously uncharacterized in human cells, are rapidly and reversibly reduced in response to DNA damage. Finally, we show that the histone acetyl-transferase GCN5/KAT2A acetylates H3K56 in vitro and in vivo. Collectively, our data indicate that though most histone modifications do not change appreciably after genotoxic stress, H3K9Ac and H3K56Ac are reduced in response to DNA damage in human cells.
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