A hallmark of the immune system is the interplay among specialized cell types transitioning between resting and stimulated states. The gene regulatory landscape of this dynamic system has not been fully characterized in human cells. Here we collected assay for transposase-accessible chromatin using sequencing (ATAC-seq) and RNA sequencing data under resting and stimulated conditions for up to 32 immune cell populations. Stimulation caused widespread chromatin remodeling, including response elements shared between stimulated B and T cells. Furthermore, several autoimmune traits showed significant heritability in stimulation-responsive elements from distinct cell types, highlighting the importance of these cell states in autoimmunity. Allele-specific read mapping identified variants that alter chromatin accessibility in particular conditions, allowing us to observe evidence of function for a candidate causal variant that is undetected by existing large-scale studies in resting cells. Our results provide a resource of chromatin dynamics and highlight the need to characterize the effects of genetic variation in stimulated cells.
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Our RNA-seq, ATAC-seq and ChIP-seq data have been deposited with the Gene Expression Omnibus (GEO): RNA-seq data (accession no. GSE118165); ATAC-seq data (accession no. GSE118189); ChIP-seq data (accession no. GSE126505). Progenitor data have been deposited with the GEO under accession no. GSE74912. Additional supplementary information can be retrieved from the Pritchard Lab Data website (http://web.stanford.edu/group/pritchardlab/dataArchive.html).
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We thank D. Yao for helping process the samples, C. J. Ye and members of the Greenleaf, Marson and Pritchard laboratories for helpful conversations and manuscript feedback. We relied on the Flow Cytometry Core at UCSF, which was supported by Diabetes Research Center grant nos. NIH P30 DK063720 and 1S10OD021822-01, and sequencing data generated by the Stanford Functional Genomics Facility on an Illumina HiSeq 4000 that was purchased with funds from the National Institutes of Health (NIH) under award no. S10OD018220. Sequencing that was generated on an Illumina NovaSeq was supported by the Chan Zuckerberg Biohub. Some of the computing for this project was performed on the Sherlock cluster. Sequencing of the ChIP-seq libraries was supported by the UCSF Center for Advanced Technology. We thank Stanford University and the Stanford Research Computing Center for providing computational resources and support that contributed to these research results. Support for D.C. was provided by National Library of Medicine training grant no. T15LM007033. A. Mezger is supported by the Swedish Research Council (grant no. 2015-06403). F.B. was supported by the Care-for-Rare Foundation and NIH/National Institute of General Medical Sciences funding for the HIV Accessory & Regulatory Complexes Center (no. P50 GM082250; A.Marson). This work was supported by NIH grants (no. 1R01HG008140—J.P. serves as principal investigator with subcontract to A. Marson and L.A.C. at UCSF; no. P30AR070155 to L.A.C.; no. DP3DK111914-01 to A. Marson; no. P50HG007735 to W.J.G.; no. UM1HG009442 to W.J.G.; no. U19AI057266 to W.J.G.), the Howard Hughes Medical Institute (J.K.P.), the Rheumatology Research Foundation (L.A.C.), the UCSF-Stanford Arthritis Center of Excellence (L.A.C.) (supported in part by the Arthritis Foundation), the Rita Allen Foundation (W.J.G.), the Human Frontiers Science Program grant no. RGY006S (W.J.G.), the Burroughs Wellcome Fund (A. Marson) and the National Multiple Sclerosis Society (A. Marson; no. CA 1074-A-21). Both W.J.G. and A. Marson are supported by the Chan Zuckerberg Biohub. Additionally, A. Marson holds a Career Award for Medical Scientists from the Burroughs Wellcome Fund, has received funding from the Innovative Genomics Institute and is supported by the Parker Institute for Cancer Immunotherapy.
Stanford University has filed a provisional patent application on the methods described and W.J.G. is named as an inventor. W.J.G. is a cofounder of Epinomics and consultant for 10x Genomics and Guardant Health. A. Marson is a cofounder of Arsenal Biosciences and Spotlight Therapeutics. A.Marson serves as on the scientific advisory board of PACT Pharma, is an advisor to Trizell and was a former advisor to Juno Therapeutics. The Marson Laboratory has received sponsored research support from Juno Therapeutics, Epinomics, Sanofi and a gift from Gilead.
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Integrated supplementary information
Representative flow cytometry plots of the sorting panels for each population of immune cells. Monocytes, bulk CD4+ T and B cells were positive enriched with magnetic beads prior to sorting. Pan T cells, DCs and NK cells were negatively enriched.
a, Enrichment of ATAC-seq reads relative to RefSeq TSSs for B cells (top) and CD4+ T cells (bottom). b, Examples of gene expression across lineages, y-axis represents log2 (count per million (CPM)). c, Correlogram of Pearson’s R2 for ATAC (left) and RNA (right) for all overlapping samples. d, RNA-seq tSNE of batch corrected read count matrix at protein coding genes. Samples sizes can be found in Supplementary Table 1.
Enrichment analysis of genome-wide overlap between regions within corresponding sets (above) and previously published functional data using the LOLA tool (Sheffield, N.C. et al., Bioinformatics. 32, 587-9, 2016). The heatmap shows the combined rank (lower values correspond to higher enrichments) for the most significantly enriched datasets (see Methods). Sample sizes can be found in Supplementary Table 1.
a, Vignette highlighting accessibility surrounding IL23R. We have highlighted significant GWAS variants from several autoimmune disorders. b, Gene expression of various important TFs. Sample sizes can be found in Supplementary table 1.
a, Volcano plot of differentially accessible chromatin regions (see Methods) for mature NK (left) and monocytes (right). b, PCA of resting (blue) and stimulated (red) ATAC-seq samples including the innate cells (triangles). c, MACS2 peak count across different cell types stratified by condition. MACS2 peak counts were normalized for read count and sample quality effects. The dotted lines indicate the median count of accessible regions in stimulated (red) and resting (blue) samples. d, Heatmap of chromVar TF binding deviation scores (see Methods) for several PWMs (y-axis) and samples (x-axis). e, Gene expression of SPI1 separated by lineage. f, Expression of BATF grouped by lineage and condition. Resting samples indicated in blue and stimulated samples in red. g, Expression of BATF target genes in B cells (left) and Th17 precursors (right). Sample sizes can be found in Supplementary Table 1.
a, ATAC-seq profile surrounding the CD14 gene. There are accessibility peaks specific to dendritic cells and monocytes, which express CD14. b, Comparison of stimulation gene expression effects estimated from monocytes from this study and Alasoo, K. et al, Nature Genetics. 50, 424-431, 2018. We list the Pearson’s correlation between the effects estimated from each data source. c, Monocyte-specific PCA plot based on RNA-seq (top) and ATAC-seq (bottom) data. The donor of the specific sample is labeled. Sample sizes can be found in Supplementary Table 1.
Representative histogram plots showing CD69 expression by flow cytometry. Line indicates gating of CD69 positive cells in reference to negative control. These experiments were not repeated. a, Surface expression of CD69 at 6hrs post stimulation. b, Surface expression of CD69 at 24hrs post stimulation.
Supplementary Fig. 8 Pathway analysis of stimulation-specific genes and correlation between promoter accessibility and gene expression.
a, Heatmap of pathway enrichment analysis results from all significant differentially expressed genes from each cell subset (see Methods). We have included the top 3 pathways from several pathway databases (keg=KEG pathways, rea=REACTOME, BP=GO: biological process, CC=GO:cellular component, MF=GO:molecular function). b, Pearson’s correlation between promoter accessibility and gene expression in resting state samples (top) and stimulated samples (bottom). c, Promoter accessibility boxplot of stimulation-associated genes in samples in a resting state and a stimulated state. Sample sizes can be found in Supplementary Table 1. A two-sided p-value test was performed.
a, Changes in the proportion of reads mapping to the reference allele at heterozygous sites as a function of stimulation condition and PWM-predicted JUNB, BACH1 and FOSL1 binding affinity. The PWM associated with each TF is visualized below. We display the p-value computed from a Kruskal-Wallis test. b, Similar to Fig. 4d but displaying sharing of allele-specific chromatin effects for each donor. c, Similar to (b) but visualized as a boxplot. Sample sizes can be found in Supplementary Table 1.
a, Significance of heritability enrichment between samples and complex traits (see Methods). b, Trait heritability enrichment of samples from various lineage and condition classes. Resting samples indicated in blue and stimulated samples in red. Innate cells were excluded. c, Heatmap showing top 100 accessible peaks (y-axis) for lineage clusters (labeled) that are unique for different cell lineages conditions across samples (x-axis). Increasingly accessible regions are colored red corresponding to a larger scaled intensity value (see Methods). d, Definition of peak profiles. Peak profiles are labeled on the y-axis, which are defined by accessibility in various lineage-condition groups on the x-axis. Sample sizes can be found in Supplementary Table 1.
a, Similar to Fig. 6a, however we included an additional null set of SNPs (green). The new null set represent the entire set of heterozygous variants where we computed a p-value. b, Similar to Fig. 6b, however we used eQTLs from naïve T cells that were previously published (Chen, L. et al., Cell. 167, 1398-1414 e24, 2016). Sample sizes can be found in Supplementary Table 1. We computed p-values with a two-sided Mann–Whitney U test.
Visualization of chromatin accessibility surrounding the TNFAIP3 gene, across all samples. Darker colored regions indicate increased accessibility of resting (blue) and stimulated (red) samples. A box highlights the candidate GWAS variant.
a, UC-associated variants that overlap accessible regions at the TNFAIP3 locus and the distribution of stimulation-effects across all cell types. The variants rs9321624, rs9321625, and rs9402908 overlap the same accessible region. b, The distribution of PWM-predicted NFκB1 binding affinity across all heterozygous sites from four donors. The reference allele at chr6:138002175 is represented by the solid vertical line, and the alternative is represented by the dotted vertical line. c, Gene expression measured for NFκB1 grouped by lineage and condition. Sample sizes can be found in Supplementary Table 1.
a, CD4+ T cells at rest, TNFAIP3 is constitutively expressed and candidate region is inaccessible. TNFAIP3 inactivates NFκB1. b, Upon initial stimulation, expression of TNFAIP3 is decreased (resulting in activation of NFκB1) and the candidate region becomes accessible. c, We propose that NFκB1 binds to the candidate variant to enhance the expression of TNFAIP3. d, Illustration of the overall regulatory network, by which rs6927172 has an effect on autoimmune disease risk.
Supplementary Note and Supplementary Figs. 1–14.
Additional supplementary tables. Miscellaneous collection of tables with additional study information.
Differentiation ATAC-seq peaks. Significant differentiation-associated ATAC-seq peaks.
Differentiation genes. Significant differentiation-associated RNA-seq genes.
Stimulation ATAC-seq peaks. Significant stimulation-associated ATAC-seq peaks.
Stimulation genes. Significant stimulation-associated RNA-seq genes.
Aggregated GWAS and functional information. Table with significant GWAS, variants with allele-specific chromatin accessibility that disrupt PWM-predicted transcription factor binding, regions of differential accessibility and nearby differentially expressed genes.
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Calderon, D., Nguyen, M.L.T., Mezger, A. et al. Landscape of stimulation-responsive chromatin across diverse human immune cells. Nat Genet 51, 1494–1505 (2019). https://doi.org/10.1038/s41588-019-0505-9