Accumulation of tau and amyloid-β are two pathologic hallmarks of Alzheimer’s disease. We conducted an epigenome-wide association study using the histone 3 lysine 9 acetylation (H3K9ac) mark in 669 aged human prefrontal cortices; in contrast with amyloid-β, tau protein burden had a broad effect on the epigenome, affecting 5,990 of 26,384 H3K9ac domains. Tau-related alterations aggregated in large genomic segments reflecting spatial chromatin organization, and the magnitude of these effects correlated with the segment’s nuclear lamina association. Functional relevance of these chromatin changes was demonstrated by (1) consistent transcriptional changes in three independent datasets and (2) similar findings in two mouse models of Alzheimer’s disease. Finally, we found that tau overexpression in induced pluripotent stem cell-derived neurons altered chromatin structure and that these effects could be blocked by a small molecule predicted to reverse the tau effect. Thus, we report broad tau-driven chromatin rearrangements in the aging human brain that may be reversible with heat-shock protein 90 (Hsp90) inhibitors.
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Human H3K9ac ChIP-seq data has been deposited at Synapse (Synapse: syn4896408). Mouse H3K9ac ChIP-seq data (GEO GSE97560) and ATAC-seq data from iNs (GEO GSE97409) have been deposited at Gene Expression Omnibus. Phenotype variables for the ROS/MAP studies can be requested from the RADC Research Sharing Hub (https://www.radc.rush.edu).
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This work has been supported by NIH grants U01 AG046152, R01 AG036836, RF1 AG015819, R01 AG017917, RC2 AG036547. L-H. T. has been supported by NIH/NINDS/NIA (R01 NS078839) and the Robert A. and Renee R. Belfer Family Foundation. The Mayo Clinic Alzheimer’s Disease Genetic Studies were led by N. Ertekin-Taner and S. G. Younkin, Mayo Clinic, Jacksonville, FL, using samples from the Mayo Clinic Study of Aging, the Mayo Clinic Alzheimer’s Disease Research Center and the Mayo Clinic Brain Bank. Data collection was supported through funding by NIA grants P50 AG016574, R01 AG032990, U01 AG046139, R01 AG018023, U01 AG006576, U01 AG006786, R01 AG025711, R01 AG017216, R01 AG003949, NINDS grant R01 NS080820, CurePSP Foundation and support from Mayo Foundation.
B.E.B. owns equity in Fulcrum Therapeutics, 1CellBio Inc., Nohla Therapeutics and HiFiBio Inc., and is an advisor for Fulcrum Therapeutics, HiFiBio Inc. and Cell Signaling Technologies. The other authors declare no competing interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Integrated supplementary information
Supplementary Figure 1. H3K9ac in the human cortex occurs primarily at active promoters and enhancers and is associated with transcription.
a, Bars depict the fraction of each chromatin state overlapped by H3K9ac domains. Chromatin states were obtained from a DLPFC sample with minimal neuropathology (E073) included in the Roadmap Epigenomics Project. b, Bars show the proportions of chromatin states for each cluster centroid obtained by clustering H3K9ac domains based on chromatin state annotation. c, Boxplot shows the number of reads observed within the 26,384 H3K9ac domains standardized by sequencing depth and domain width (median log2 rpkm values of n=669 subjects). d, Boxplot shows the width of H3K9ac domains. The center line of the boxplot shows the median, the outer edges correspond to the lower and upper quartiles, and the whiskers extend to the most extreme observed value within 1.5×IQR from the edges. e,f, Estimated effect sizes for tau (e) and for amyloid-β (f) on H3K9ac are shown separately for promoter, enhancer and other domains. Significant effect sizes (two-sided Wald test, FDR threshold of 0.05, n=669 subjects) are colored red. g,h, Boxplots show the effect size of tau (g) and amyloid-β (h) in RNA-seq data for transcripts whose H3K9ac levels were associated (p ≤ 10-4) with tau (n=2,492 transcripts) (g) or amyloid-β (n=47 transcripts) (h) respectively. Only active transcripts with a H3K9ac domain in their promoters were considered (18,257 transcripts). The center line of the boxplot shows the median, the outer edges correspond to the lower and upper quartiles, and the whiskers extend to the most extreme observed value within 1.5×IQR from the edges. i, Density plot depicts the relation between promoter H3K9ac and transcription. For each RefSeq transcript, the median standardized read count from the RNA-seq data (n=500 subjects) is plotted against median standardized read count in the respective promoter (±2 kb around transcriptional start site) from the H3K9ac ChIP-seq data (n=669 subjects). Spearman correlation is depicted in the plot
Supplementary Figure 2. Tau-related but not amyloid-β-related chromatin alterations show spatial patterns in the human cortex and in induced neurons.
a,b, Manhattan plots depict unadjusted log-transformed p-values for tau coefficients (a) and amyloid-β coefficients (b) of 26,384 H3K9ac domains in the human prefrontal cortex (two-sided Wald test, n=669 subjects). Transformed p-values were plotted with the sign of the respective coefficient to distinguish between positive and negative associations. The red dashed lines indicate the significant threshold at an FDR of 0.05. For tau (a), broad genomic segments covering H3K9ac domains showing similar associations were observed and depicted by orange line segments. c, Manhattan plot depicts the log-transformed p-values for differences between MAPT overexpressing neurons and controls of 40,637 ATAC domains (two-sided t-test, n=18 independent experiments). Transformed p-values were plotted with the sign of the test statistic to distinguish between increased and decreased chromatin accessibility. Red dashed lines indicate the significance threshold at an FDR of 0.05. Broad genomic segments covering ATAC domains showing similar changes in chromatin accessibility are depicted as purple line segments
Supplementary Figure 3. Broad tau-related H3K9ac alterations in human cortical tissue are not primarily driven by changes in cell-type proportions.
a-f, Density plots show on the x-axis the effect sizes for tau obtained from the model used for the main analysis (“unadjusted model”) applied to a subset of n=452 H3K9ac subjects where RNA-seq data was available. On the y-axis, tau effect sizes were adjusted by adding the estimated proportion of neurons (a), astrocytes (b), oligodendrocytes (c), myeloid cells (d), endothelial cells (e), or the proportions of all five cell type (f) as covariates to the regression model. Pearson correlation between effect sizes from the unadjusted model and from any adjusted model was ≥ 0.99. H3K9ac domains that were significant (FDR ≤ 0.05) in an adjusted model but not significant (FDR > 0.1) in the unadjusted model are shown as green dots. None of the H3K9ac domains that were significant in the unadjusted model lost significance in any adjusted model
Supplementary Figure 4. ATAC domains are primarily located at TSS, TSS-flanking regions, and enhancer regions and are reproducibly altered by MAPT overexpression in induced neurons.
a, Bars show the proportions of chromatin states for each cluster centroid obtained by clustering ATAC domains based on chromatin state annotation. Chromatin states were obtained from H9-derived cultured neurons (E010) included in the Roadmap Epigenomics Project. b, Boxplot shows the number of reads observed within the n=40,637 ATAC domains standardized by sequencing depth and domain width (median log2 rpkm values of n=18 independent experiments). c, Boxplot shows the width of ATAC domains. The center line of the boxplot shows the median, the outer edges correspond to the lower and upper quartiles, and the whiskers extend to the most extreme observed value within 1.5×IQR from the edges. d, Dendrogram depicts results obtained from hierarchical clustering (Euclidian distance, average linkage) of the MAPT OE and control iNs generated in three batches. Read counts in ATAC domains were normalized for different library sizes before clustering. e-g, Scatterplot of the segments' mean tau-related changes observed in batch 1 versus batch 2 (e), batch 1 versus batch 3 (f), and batch 2 versus batch 3 (g). h-j, Scatterplot shows association between the proportion of LADs in the segments on the x-axis and and the segments' mean tau-related changes on the y-axis for batch 1 (h), batch 2 (i), and batch 3 (j). Pearson correlation weighted by the number of ATAC domains in each segment is shown in the plots e-j. Each batch consisted of n=6 independent experiments. k, Points depict the segmentation scores of the MAPT overexpressing iNs (n=9 independent experiments) and the control iNs (n=9 independent experiments). Red diamonds indicate group means. A two-sided t-test was applied to assess statistical significance. The segmentation score quantifies whether the tau-related chromatin changes observed in the human brain H3K9ac data occur in a given sample, and is calculated as described in the Methods
Supplementary Figs. 1–4 and Supplementary Tables 4, 7–9, 12, 13
Quality control metrics for the 669 H3K9ac ChIP-seq samples from human DLPFC.
Locations of the 26,384 H3K9ac domains detected in the human DLPFC ChIP-seq samples.
Table of H3K9ac domains significantly associated with tau (or amyloid-β) at an FDR of 0.05; m = 26,384 H3k9ac domains were tested in n = 669 subjects using two-sided Wald tests.
Table of transcripts that were significantly associated with tau (amyloid-β) at an FDR of 0.05 in both H3K9ac data and transcription data. m =26,384 H3k9ac domains were tested in n = 669 subjects using two-sided Wald tests. m = 18,257 active transcripts were tested in n = 500 subjects using two-sided t tests. Only transcripts with an H3K9ac domain at the TSS were considered.
List of 178 segments derived from the H3K9ac data annotated with nuclear lamina association and chromatin accessibility. This table includes the average tau effects in the segments observed in H3K9ac data, RNA-seq data, DNA methylation data, Mayo LOAD study transcription data, neuronal transcription data, ATAC-seq data from iNs, and H3K9ac data from iNs depicted in Figs. 2e and 4i.
List of 99 segments derived from the ATAC-seq data annotated with the nuclear lamina association and chromatin accessibility. This table includes the average tau effects in the segments observed in the ATAC-seq data from MAPT OE iNs and control iNs.
Results from screening the Connectivity Map for drugs candidates using the H3K9ac signature for tau and for amyloid-β. H3K9ac domains were mapped to genes and Spearman correlations between standardized tau (amyloid-β) effects and the differential transcription signatures of the Connectivity map were calculated. Enrichment scores and permutation-based P values from the Connectivity Map search algorithm are given in columns “Enrichment” and “P”. Column “n” refers to the number of profiles for that perturbagen in the Connectivity Map data base. The Connectivity Map can be accessed at https://portals.broadinstitute.org/cmap.
Quality control metrics for the H3K9ac ChIP-seq samples from the tau mouse model (n = 11 mice) and from the CK-p25 mouse model (n = 12 mice).
Quality control metrics for the ATAC-seq (n = 36) and H3K9ac ChIP-seq experiments (n = 3) with induced neurons.
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Klein, HU., McCabe, C., Gjoneska, E. et al. Epigenome-wide study uncovers large-scale changes in histone acetylation driven by tau pathology in aging and Alzheimer’s human brains. Nat Neurosci 22, 37–46 (2019). https://doi.org/10.1038/s41593-018-0291-1
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