BAZ2A safeguards genome architecture of ground-state pluripotent stem cel (2020)
Figure 5

Figure 5

BAZ2A regulates chromatin accessibility in ground-state ESCs

A. Numbers of ATAC peaks called separately in ESC+2i and ESC+serum including their localization according to compartmentalization.

B. Numbers of significant changed ATAC peaks in ESC+2i vs. ESC+serum and their localization according to compartmentalization. Increased chromatin accessibility sites (IAS), decreased accessibility sites (DAS).

C. Average profile of normalized ATAC read counts over differential peaks in ESC+2i and ESC+serum changed ATAC peaks. The signal is plotted over +/- 1kb on the center of the ATAC peak.

D. H3K27ac correlates with differential accessible sites between ESC+2i and ESC+serum. Boxplot showing the mean values of normalized H3K27ac at ATAC peaks (+/- 500bp) that are increased and decreased in ESC+2i compared to ESC+serum, respectively. ESCs were subjected to two consecutive treatments with siRNA-control and siRNA-Baz2a, each one lasting for 4 days. Statistical significance (P-values) for the experiments was calculated using the paired two-tailed t-test (*** < 0.001). Box plots depict the minimum and maximum values. The mean is represented by a horizontal line within the boxes.

E. BAZ2A depletion increases chromatin accessibility only in ESC+2i. Numbers of significant changed ATAC peaks in ESC+2i and ESC+serum upon BAZ2A knockdown and their localization according to compartmentalization.

F. Average density plots of normalized ATAC read counts over differential ATAC peaks of ESC+2i and ESC+serum treated with siRNA-Baz2a and siRNA-control over changed ATAC peaks. The signal is plotted over +/- 1kb centered on the ATAC peak.

G. The distances of increased (IAS) and decreased (DAS) chromatin accessibility sites in BAZ2A-depleted ESC+2i to the nearest gene promoter (+/- 5kb of TSS) were calculated. Distances in bp to the nearest promoter of genes upregulated (UP), downregulated (DOWN) or not affected (NOT) upon BAZ2A knockdown in ESC+2i are plotted. Statistical significance (P-values) for the experiments was calculated using the unpaired two-tailed t-test (** < 0.01). Error bars represent s.d. The mean is represented by a horizontal line.

H. Genomic annotation of IAS and DAS in ESC+2i depleted of BAZ2A perfomed with ChIPseeker (Yu et al., 2015).

I. Fold-enrichment relative to expected of regions with increased chromatin accessibility (IAS) and upregulated genes upon BAZ2A KD at sub-regions within compartment A and B (center, inside and boundaries). Compartments smaller than 500 kb were excluded from the analysis. Statistical significance (P-values) was calculated with permutation test (ns: non significant, * < 0.05, *** < 0.001).

J. BAZ2A-upregulated genes are enriched in the B compartment. Numbers of BAZ2A-regulated genes upregulated and downregulated upon BAZ2A knockdown in ESC+2i including their localization according to compartmentalization.

K. Active histone marks increase in the B compartment upon BAZ2A knockdown. Boxplots indicating the log2 fold-changes of normalized H3K27ac and H3K4me3 read counts in ESC+2i treated with siRNA-Baz2a and siRNA-control at boundaries and centers of A and B compartments. ). Statistical significance (P-values) for the experiments was calculated using the unpaired two-tailed t-test (*** < 0.001, * < 0.05). Box plots depict the minimum and maximum values. The mean is represented by a horizontal line within the boxes.