Abstract
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, we analyzed ATAC-seq and RNA-seq profiles from stimulated primary CD4+ T cells in up to 105 healthy donors. We found that regions of accessible chromatin (ATAC-peaks) are co-accessible at kilobase and megabase resolution, consistent with the three-dimensional chromatin organization measured by in situ Hi-C in T cells. Fifteen percent of genetic variants located within ATAC-peaks affected the accessibility of the corresponding peak (local-ATAC-QTLs). Local-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.
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Acknowledgements
We thank the ImmVar participants. We would like to thank J. Buenrostro for critical reading of the manuscript and advice on ATAC-seq analysis, J. Pfiffner and C. Fulco for initial experimental help with ATAC-seq, A. Schep for ATAC-seq nucleosome free caller, N. Asinovski and H.-k. Kwon for help setting up primary T cell cultures and members of the Regev and Ye laboratories for discussions. R.E.G. and C.J.Y. are supported by NIH R01-AR071522 to C.J.Y. M.A.B. and K.L.H. are supported by NIH HG007348 to M.A.B.; H.Y.C. is supported by NIH grant P50-HG007735; C.S.C. is supported by the NIH through a Ruth L. Kirschstein National Research Service Award (F32-DK096822). This work was supported by the Klarman Cell Observatory at the Broad Institute. A.R. is a Howard Hughes Medical Institute Investigator.
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Contributions
A.R., C.J.Y. and C.S.C. conceived this project. C.S.C. and A.S. performed ATAC-seq and RNA-seq assays. I.W. cultured T cells and collected the fixed pellet for Hi-C assay. A.P.A., I.M., M. Shamim, S.-C.H., N.C.D. and E.L.A. performed and analyzed the Hi-C data set. R.E.G., M.T., D.L., M.G.G. and M. Subramaniam analyzed the ATAC-seq and RNA-seq data sets. K.L.H. and M.A.B. additionally analyzed the ATAC-seq data set. R.E.G. additionally analyzed the Hi-C data set. T.F., P.L.D.J. and C.B. provided the patient samples. H.Y.C. provided helpful comments and discussion. R.E.G., C.S.C., C.J.Y. and A.R. wrote the manuscript.
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A.R. is an SAB member of ThermoFisher Scientific, Syros Pharmaceuticals and Driver group and a founder of Celsius Therapeutics.
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Supplementary information
Supplementary Text and Figures
Supplementary Figures 1–19
Supplementary Table 1
Stimulation response
Supplementary Table 3
Covariates and mismatches
Supplementary Table 4
PC correlation to chromatin accessibility and gene expression
Supplementary Table 5
Co-accessibility
Supplementary Table 6
ATAC-QTLs
Supplementary Table 7
ATAC heritability
Supplementary Table 9
Expression heritability
Supplementary Table 10
Stimulation response
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Gate, R.E., Cheng, C.S., Aiden, A.P. et al. Genetic determinants of co-accessible chromatin regions in activated T cells across humans. Nat Genet 50, 1140–1150 (2018). https://doi.org/10.1038/s41588-018-0156-2
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DOI: https://doi.org/10.1038/s41588-018-0156-2
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