Genetic determinants of co-accessible chromatin regions in activated T cells across humans
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE115980 | GEO | 2018/07/01
REPOSITORIES: GEO
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Project description:<p>Profiling of gene expression with microarrays holds great potential for human health, for illuminating disease pathways or providing biomarkers to monitor disease or its resolution. Using high-throughput approaches for genotyping, immunophenotyping and gene expression analysis, the project will examine the basis for the control of gene expression in human immune cells, and how it is influenced by natural genetic variation or aging. In practice, the project will combine several cross-informative approaches: 1) Building on the established sample/data pipelines and robust protocols of the Immunological Genome (ImmGen) project, and on established cohorts of ethnically diverse healthy volunteers at hand, microarray techniques will be used to generate whole-genome expression profiles from purified naive CD4+ lymphocytes and monocytes from 600 healthy volunteers. A dense genetic map will be established for all donors. The results will elucidate how variation in the human genome affects the expression of immune genes, of key importance in understanding gene variants that bring susceptibility to immune or inflammatory disease. Computational analysis of these rich data will allow the reconstruction of regulatory connections between genes, helping to establish general modules and those specific of a given immune cell type. These data will be complemented by an orthogonal data group, generated from a restricted subset of 10 individuals, in which we will profile a larger set of 28 carefully delineated cell populations that exist in human blood. This work will also benefit from powerful interspecies comparison with similar experiments being performed in mice by ImmGen. 2) In addition, RNA from the same set of 28 defined cell populations will be probed with microarrays that explore other aspects of the transcriptome: i) microRNAs and other non-coding RNAs; ii) exon or splice junction arrays that will establish a map of differential splicing in human blood leukocyte. 3) The composition and reactivity of blood cells from the same donors will be established at the time of sample collection using high-throughput flow cytometry, correlating immune phenotypes with gene expression and genetic variation. 4) Genetic variability conditions the baseline levels of gene expression, but also the responsiveness to activating challenges. With samples from the same donors, NanoString technology for transcript counting will be used to analyze the transcriptional response of defined gene sets, representing response signatures of T or dendritic cells, for a fine-grained dissection of responses to different triggers (different bacterial ligands for dendritic cells, different cytokine environment for T cells). In keeping with the resource aspect of this project, all data and interpretations will be made publicly available rapidly upon curation, allowing public querying and browsing of the data, by using and evolving the existing web architectures of the ImmGen project, of the Broad Institute, and of international repositories. RELEVANCE: Exploration with DNA chips of the genome's expression microarrays holds great potential for human health, to better understand disease and to serve as diagnostic tools. Using a combination of high-throughput genomic techniques and computational biology, we will perform a broad exploration of gene expression in human blood cells across groups of African-American, Asian and European ancestry, asking how these profiles are affected by genetic variation or by age. These results will provide an invaluable reference benchmark for the interpretation of genetic and immunological studies.</p> <p>Additionally, over 90% of genetic variants associated with complex human traits map to non-coding regions, but little is understood about how they modulate gene regulation in health and disease. One possible mechanism is that genetic variants affect the activity of one or more cis-regulatory elements leading to gene expression variation in specific cell types. To identify such cases, in a second study we analyzed ATAC-seq and RNA-seq profiles from stimulated primary CD4+ T cells in up to 105 healthy donors. We found regions of accessible chromatin (ATAC-peaks) are co-accessible at kilobase and megabase resolution. 15% of genetic variants located within ATAC-peaks affected the accessibility of the corresponding peak (ATAC-QTLs). ATAC-QTLs have the largest effects on co-accessible peaks, are associated with gene expression, and are enriched for autoimmune disease variants. Our results provide insights into how natural genetic variants modulate cis-regulatory elements, in isolation or in concert, to influence gene expression.</p>
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Project description:We report a comprehensive DNA accessibility profile of the Demosponge species Amphimedon queenslandica using Assay for Transposase-Accessible Chromatin with sequencing (ATAC-seq) through six embryonic developmental stages, a larval stage and adult stage. We assessed the dynamics of chromatin accessibility and identified 40,218 consensus peaks, 4,751 of them were differentially accessible in at least one developmental stage. Cis-regulatory elements were more dynamically regulated while proximal elements were more likely to be constitutively active. Furthermore, we identify a shift towards repressive chromatin in mid and late developmental stages which coincide with the increase in expression of genes of Metazoan origin. Finally, we show that cis-regulatory regions are differentially enriched in different Transcription Factor binding sites (TFBS) which demarcate three main stages of development and importantly, they are predictive of cis-regulatory regions in other animal species but not in Capsaspora owczarzaki, a close relative of animals.
2021-10-10 | E-MTAB-10203 | biostudies-arrayexpress
Project description:We surveyed the variation and dynamics of active regulatory elements genome-wide in CD4+ T cells, using Assay of Transposase Accessible Chromatin with sequencing (ATAC-seq) in longitudinal samples from healthy volunteers and during T cell activation. We created robust pipelines that enable accurate single molecule counting and allelic discrimination from clinical material. Over 4000 regulatory elements (7.2%) showed reproducible personal variation in activity. Gender was the most significant attributable source of regulome variation. ATAC-seq revealed novel elements that escape X chromosome inactivation and predicted gender-specific gene regulatory networks across autosomes, which coordinately impact genes with immune function. Noisy regulatory elements with personal variation in accessibility are significantly enriched for autoimmune disease loci. Over one third of regulome variation lacked genetic variation in cis, suggesting contributions from environmental or epigenetic factors. These results refine concepts of human individuality and provide foundational reference to compare disease-associated regulomes. We examined chromatin structure using ATAC-seq in purified human CD4+ T cells in 33 samples from 12 healthy donors and 15 samples from 3 patients with cutaneous T cell leukemia (CTCL). For T cell activation (TCA) time course, CD4+ cells from healthy donor 1 isolated as above were stimulated with ionomycin (1 ug/mL) and Phorbol Myristate Acetate (PMA; 20 ng/mL) and collected at 0, 1, 2, 4 hours in duplicate.
2015-06-23 | E-GEOD-60682 | biostudies-arrayexpress
Project description:Atopic dermatitis (AD), the start of the atopic march, is one of the most common skin disorders in children. Immunologically, AD involves skin barrier defects and CD4+ T cells that localize to the skin, producing inflammatory cytokines and amplifying epidermal dysfunction. To understand the gene regulatory activity differences in peripheral blood T cells in AD, we measured chromatin accessibility (ATAC-seq), NFKB1 binding (ChIP-seq), and gene expression (RNA-seq) in stimulated CD4+ T cells from subjects with active moderate-to-severe AD and age-matched healthy, non-allergic controls. Chromatin accessibility in stimulated CD4+ T cells were highly enriched for AD genetic risk variants. The vast majority of ATAC-seq peaks were shared, consistent with those sections of chromatin being equally available between matched pairs; however, NFKB DNA binding motifs were enriched in chromatin accessible in an AD-dependent manner. NFKB1 ChIP-seq identified peaks that were stronger in AD cases, enriched in controls, or shared between cases and controls. The ChIP-seq peaks that were statistically stronger in AD were more strongly enriched for NFKB DNA binding motifs. Chromatin that was more strongly accessibe and bound by NFKB1 in AD were enriched for genetic variants that increase risk for AD. Using whole genome sequencing data, we identified wide-spread genotype-dependent chromatin accessibility and allelic NFKB1 binding at AD and allergic disease genetic risk loci.
2022-04-26 | GSE184237 | GEO
Project description:Atopic dermatitis (AD), the start of the atopic march, is one of the most common skin disorders in children. Immunologically, AD involves skin barrier defects and CD4+ T cells that localize to the skin, producing inflammatory cytokines and amplifying epidermal dysfunction. To understand the gene regulatory activity differences in peripheral blood T cells in AD, we measured chromatin accessibility (ATAC-seq), NFKB1 binding (ChIP-seq), and gene expression (RNA-seq) in stimulated CD4+ T cells from subjects with active moderate-to-severe AD and age-matched healthy, non-allergic controls. Chromatin accessibility in stimulated CD4+ T cells were highly enriched for AD genetic risk variants. The vast majority of ATAC-seq peaks were shared, consistent with those sections of chromatin being equally available between matched pairs; however, NFKB DNA binding motifs were enriched in chromatin accessible in an AD-dependent manner. NFKB1 ChIP-seq identified peaks that were stronger in AD cases, enriched in controls, or shared between cases and controls. The ChIP-seq peaks that were statistically stronger in AD were more strongly enriched for NFKB DNA binding motifs. Chromatin that was more strongly accessibe and bound by NFKB1 in AD were enriched for genetic variants that increase risk for AD. Using whole genome sequencing data, we identified wide-spread genotype-dependent chromatin accessibility and allelic NFKB1 binding at AD and allergic disease genetic risk loci.
2022-04-26 | GSE183257 | GEO
Project description:Atopic dermatitis (AD), the start of the atopic march, is one of the most common skin disorders in children. Immunologically, AD involves skin barrier defects and CD4+ T cells that localize to the skin, producing inflammatory cytokines and amplifying epidermal dysfunction. To understand the gene regulatory activity differences in peripheral blood T cells in AD, we measured chromatin accessibility (ATAC-seq), NFKB1 binding (ChIP-seq), and gene expression (RNA-seq) in stimulated CD4+ T cells from subjects with active moderate-to-severe AD and age-matched healthy, non-allergic controls. Chromatin accessibility in stimulated CD4+ T cells were highly enriched for AD genetic risk variants. The vast majority of ATAC-seq peaks were shared, consistent with those sections of chromatin being equally available between matched pairs; however, NFKB DNA binding motifs were enriched in chromatin accessible in an AD-dependent manner. NFKB1 ChIP-seq identified peaks that were stronger in AD cases, enriched in controls, or shared between cases and controls. The ChIP-seq peaks that were statistically stronger in AD were more strongly enriched for NFKB DNA binding motifs. Chromatin that was more strongly accessibe and bound by NFKB1 in AD were enriched for genetic variants that increase risk for AD. Using whole genome sequencing data, we identified wide-spread genotype-dependent chromatin accessibility and allelic NFKB1 binding at AD and allergic disease genetic risk loci.
2022-04-26 | GSE189143 | GEO
Project description:Atopic dermatitis (AD), the start of the atopic march, is one of the most common skin disorders in children. Immunologically, AD involves skin barrier defects and CD4+ T cells that localize to the skin, producing inflammatory cytokines and amplifying epidermal dysfunction. To understand the gene regulatory activity differences in peripheral blood T cells in AD, we measured chromatin accessibility (ATAC-seq), NFKB1 binding (ChIP-seq), and gene expression (RNA-seq) in stimulated CD4+ T cells from subjects with active moderate-to-severe AD and age-matched healthy, non-allergic controls. Chromatin accessibility in stimulated CD4+ T cells were highly enriched for AD genetic risk variants. The vast majority of ATAC-seq peaks were shared, consistent with those sections of chromatin being equally available between matched pairs; however, NFKB DNA binding motifs were enriched in chromatin accessible in an AD-dependent manner. NFKB1 ChIP-seq identified peaks that were stronger in AD cases, enriched in controls, or shared between cases and controls. The ChIP-seq peaks that were statistically stronger in AD were more strongly enriched for NFKB DNA binding motifs. Chromatin that was more strongly accessibe and bound by NFKB1 in AD were enriched for genetic variants that increase risk for AD. Using whole genome sequencing data, we identified wide-spread genotype-dependent chromatin accessibility and allelic NFKB1 binding at AD and allergic disease genetic risk loci.
2022-04-26 | GSE184301 | GEO
Project description:We analyzed 105 chromatin accessibility (ATAC-seq) profiles in activated primary CD4+ T cells from healthy donors to identify genetic variants associated with variability in chromatin accessibility (ATAC-QTLs).we analyzed 105 chromatin accessibility (ATAC-seq) profiles in activated primary CD4+ T cells from healthy donors to identify genetic variants associated with variability in chromatin accessibility (ATAC-QTLs)
2018-07-12 | GSE86887 | GEO
Project description:Identifying the regulatory mechanisms of genome-wide association study (GWAS) loci affecting adipose tissue has been restricted due to limited characterization of adipose transcriptional regulatory elements. We profiled chromatin accessibility in three frozen human subcutaneous adipose tissue needle biopsies and preadipocytes and adipocytes from the Simpson Golabi-Behmel Syndrome (SGBS) cell strain using an assay for transposase-accessible chromatin (ATAC-seq). We identified 68,571 representative accessible chromatin regions (peaks) across adipose tissue samples (FDR<5%). GWAS loci for eight cardiometabolic traits were enriched in these peaks (p<0.005), with the strongest enrichment for waist-hip ratio. Of 110 recently described cardiometabolic GWAS loci colocalized with adipose tissue eQTLs, 59 loci had one or more variants overlapping an adipose tissue peak. Annotated variants at the SNX10 waist-hip ratio locus and the ATP2A1-SH2B1 body mass index locus showed allelic differences in regulatory assays. These adipose tissue accessible chromatin regions elucidate genetic variants that may alter adipose tissue function to impact cardiometabolic traits.
2019-01-01 | GSE110734 | GEO
Project description:In mammals, extensive chromatin reorganization is essential for reprogramming terminally committed gametes to a totipotent state during preimplantation development. However, the global chromatin landscape and its dynamics in this period remain unexplored. Here we report a genome-wide map of accessible chromatin in mouse preimplantation embryos using an improved assay for transposase-accessible chromatin with high throughput sequencing (ATAC-seq) approach with CRISPR/Cas9-assisted mitochondrial DNA depletion. We show that despite extensive parental asymmetry in DNA methylomes, the chromatin accessibility between the parental genomes is globally comparable after major zygotic genome activation (ZGA). Accessible chromatin in early embryos is widely shaped by transposable elements and overlaps extensively with putative cis-regulatory sequences. Unexpectedly, accessible chromatin is also found near the transcription end sites of active genes. By integrating the maps of cis-regulatory elements and single-cell transcriptomes, we construct the regulatory network of early development, which helps to identify the key modulators for lineage specification. Finally, we find that the activities of cis-regulatory elements and their associated open chromatin diminished before major ZGA. Surprisingly, we observed many loci showing non-canonical, large open chromatin domains over the entire transcribed units in minor ZGA, supporting the presence of an unusually permissive chromatin state. Together, these data reveal a unique spatiotemporal chromatin configuration that accompanies early mammalian development. Mouse preimplantation embryos were obtained from crosses of C57BL/6N and DBA/2N. ATAC-seq was performed in these embryos at various stages in preimplantation development.
2016-06-15 | E-GEOD-66581 | biostudies-arrayexpress