Transcription factors (TFs) direct developmental transitions by binding to target DNA sequences, influencing gene expression and establishing complex gene-regultory networks. To systematically determine the molecular components that enable or constrain TF activity, we investigated the genomic occupancy of FOXA2, GATA4 and OCT4 in several cell types. Despite their classification as pioneer factors, all three TFs exhibit cell-type-specific binding, even when supraphysiologically and ectopically expressed. However, FOXA2 and GATA4 can be distinguished by low enrichment at loci that are highly occupied by these factors in alternative cell types. We find that expression of additional cofactors increases enrichment at a subset of these sites. Finally, FOXA2 occupancy and changes to DNA accessibility can occur in G1-arrested cells, but subsequent loss of DNA methylation requires DNA replication.
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We thank all members of the laboratory of A.M., specifically A. Tsankov for advice and experimental support. M.J.Z. is supported by BMBF grant 01ZX1504 and the Max-Planck-Society. A.M. is supported as a New York Stem Cell Foundation Robertson Investigator. This work was supported by the New York Stem Cell Foundation, NIH grant 1P50HG006193 and the Max Planck Society.
The authors declare no competing financial interests.
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Integrated supplementary information
Supplementary Figure 1 Pioneer-TF systems
(a) FOXA2, part of the Forkhead box TF family, was first characterized as a pioneer TF for its ability to remodel nucleosomes at the repressed enhancers of the Albumin locus during endoderm development17,23. Ablation of FOXA2 in mice is embryonic lethal due to defects in early developmental structures, pointing to a critical role in lineage specification. Interestingly, however, after early development, FOXA2 is widely expressed across most endodermal and some ectodermal cell types, suggesting the need for specificity in its regulation29. Likewise, studies looking at FOXA1 occupancy across similar breast cancer cell types noted evidence of cell type specific binding8,9,10. Taken together, this has suggested that FOXA’s specific activity is likely not directed solely by the presence of its cognate DNA motif sequence and that there are perhaps additional features guiding even pioneer factor occupancy. To dissect this we used different Motif logo’s of the PWMs (shown in Fig. 1a) for identifying genome-wide occurrence of selected motifs throughout Hg19 using FIMO. (b) Chart displaying name of PWM used in each motif analysis, number of times the PWM mapped across the genome, the number of motifs within potentially ‘active’ regulatory regions, motifs in ‘active’ regions bound by FOXA and the calculated percentage of bound motifs. Potentially active regulatory regions were identified by utilizing all DNAse-seq, H3K27ac, and H3K4me3 data from the ENCODE project (utilizing Irreproducibility Discovery Rate (IDR) peak calling on ChIP-seq experiments; see Online Methods). (c) Peak saturation analysis of new FOXA2 peak calls obtained with FOXA2 ChIP-sequencing experiments in additional cell types. (d) Expression bar plot generated in CummeRbund displaying log2 FPKM values for FOXA family members: FOXA2, FOXA1 and FOXA3 in human hepatocytes (positive control) BJ fibroblasts, BJ fibroblasts infected with control RFP virus (negative control). Error bars represent a 95% confidence interval around the average values. (e) Immunostaining for FOXA2 in the JD1 BJFOXA2 line (10x magnification shown). White scale bar is equal to 345 nm. (f) qRT-PCR measurements of FOXA2 transcript level at four time points over a 10 day time course. No expression is measured on day 0. Stable FOXA2 transcript level is observed across days 1, 4 and 10 following induction. (g) Bright-field images show morphological change in JD1 BJFOXA2 cells after 3 days of doxycycline. White scale bar is equal to 345 nm. (h) Venn diagram displays the strong overlap and similar number of MACS peak calls for FOXA2 ChIP-sequencing after 4 and 10 days of FOXA2 induction. (i) Venn diagram demonstrating the overlap of the intersection in MACS peak calls between the BJFOXA2 day 4/day 10 time points (combined n = 73,827) and FOXA2 ChIP-sequencing after 1 day of FOXA2 induction. (j) Centrimo (4.10.2) analysis displaying top three motifs located at the summit of BJFOXA2 peaks and p-values associated with motifs.
Supplementary Figure 2 Pioneer-TF sampling
a) Read density heat maps of FOXA2 enrichment in BJFOXA2 ChIP-seq data at FOXA2 endogenous peaks from HepG2 (n = 34,595) and A549 (n = 33,041) cells. Black bars indicate peak calls in common between ectopic FOXA2 ChIP-sequencing data and endogenous (HepG2 or A549) FOXA2 ChIP-sequencing. Dashed lines represent the start and end of FOXA2 peaks. Similar to the dEN results, most HepG2 and A549 sites still show some level of enrichment of FOXA2 in BJs that are however not called as significantly enriched by our peak calling. (b) Schematic of OCT4 and GATA4 ectopic systems with corresponding cropped western blots demonstrating protein levels and immunostaining. Inf, infection (see Online Methods). White scale bar is equal to 345 nm. (c) Read density heat maps of OCT4 enrichment in BJ cells infected with OCT4, SOX2, KLF4 and cMYC5 at OCT4 bound regions in human ESCs. Dashed lines represent the start and end of OCT4 peaks. (d) Endogenous sampling demonstrated by read density heat maps of FOXA2 enrichment in HepG2 and dEN at A549 bound FOXA2 sites. Bar indicates peak calls in common between HepG2 and dEN FOXA2 ChIP-seq data and A549 FOXA2 ChIP-seq. Dashed lines mark the start and end of FOXA2 peaks. (e) Density plots displaying FOXA2 log2 RPKM enrichment in A549, HepG2, dEN and/or BJ cells, at endogenous peak sets (A549, HepG2 and dEN, respectively). Dashed lines demarcate regions within the background distribution, regions called as sampled sites and regions that were called as peaks.
Supplementary Figure 3 Influence of epigenome on pioneer-TF occupancy
a) IGV browser tracks displaying FOXA2 binding at each chromatin state we defined (coordinates from left to right: chr6:109,366,481–109,381,042; chr14:75,743,837–75,747,300; chr6:108,485,215–108,512,013; chr6:108,213,193–108,245,723; chr20:43,024,520–43,048,327). Classification was defined and employed hierarchically. (b) Chromatin state map defining percentages of dEN FOXA2 bound regions using hESC chromatin data. Spearman correlation with dEN FOXA2 peaks and human ESC chromatin. FOXA2 ESC 5.6 FPKM, and dEN FPKM 20.1. (c) Left: Stacked bar plots display FOXA2, GATA4, and OCT4 closed chromatin bound regions and levels of H3K27me3. Right: Stacked bar plot displays levels of DNAme at FOXA2 and GATA4 bound regions in closed chromatin. Pie chart displaying BJGATA4 peak overlap with CpG Islands (CGIs). (d) Schematic representation of system used to generate BJHNF1A cells. (e) IGV browser shots displaying a 400-kb genomic region in HNF1A (using V5 antibody) ChIP experiments. Top three experiments are distinct biological replicate experiments in BJHNF1A cells. In contrast, the bottom track represents HNF1A binding when FOXA2 is co-expressed. (f) Cropped western blot analysis of HNF1A (V5) protein levels in soluble nuclear, chromatin bound and whole cell lysates in BJHNF1A cells compared to BJFOXA2-HNF1A cells. Control blots in BJFOXA2 cells demonstrate difference in chromatin bound protein fraction of the two factors assessed. Full western blot is shown in Supplementary Figure 9. (g) Read density heat map displaying enrichment of BJ H3K9me3 ChIP-sequencing (REMC) at heterochromatin domains (n = 256) defined in ref.5. (h) Read density heat map displaying FOXA2 enrichment of BJ FOXA2 ChIP-sequencing (REMC) at heterochromatin domains defined in ref.5. (i) Representative IGV browser tracks showing a zoomed out view on chromosome 8 (305,736- 42,374,902) that visualizes the general depletion of FOXA2 binding within H3K9me3 marked regions. (j) Percentage of exclusively bound endogenous sites that are found in K9-domains.
Supplementary Figure 4 Cofactor influence on pioneer-TF occupancy
(a) Differential motif analysis displaying –log10 P-value of enriched motifs in BJ exclusive sites versus dEN exclusive sites with the most significant motifs on the left. Expression (log2 FPKM) of the TF associated with the motif in both BJ and dEN is shown on the bottom. (b) Venn diagram showing the overlap between IDR peak calls that are co-bound by FOXA2 and GATA4 in dEN and dEN exclusive targets as compared to BJs. (c) Box plots displaying the RPKM of GATA4 enrichment in BJGATA4 and BJFOXA2-GATA4 at the subset of regions that are GATA4 stabilized compared to the non-enriched subset. Boxes indicate interquartile range, and whiskers show maximum and minimum values. Outliers are removed. (d) Box plots displaying RPKM of ATAC-seq enrichment in uninduced BJFOXA2 versus BJFOXA2-GATA4 at GATA4 stabilized bites. Boxes indicate interquartile range and whiskers show maximum and minimum values. Outliers are removed.
Supplementary Figure 5 Transcriptional and epigenetic effect of pioneer-TF occupancy
(a) Volcano plot of differentially expressed genes on day 4 of FOXA2 induction in the BJFOXA2 line compared to the uninduced control. Differentially expressed genes are identified using cufflinks. y-axis represents –log10 of P-value while x-axis shows fold change in log2 scale. (b) Scatter plots of H3K4me1/2 and H3K27ac signal at pre- versus post-FOXA2 induction. Dots highlighted in red are at least 2-fold upregulated and reach at least 1 RPKM of post-FOXA2 induction. Ellipses roughly highlight de novo gained versus enhanced changes. De novo regions have minimal levels of either modification prior to FOXA2 occupancy, gain at least 2-fold signal as well as become enriched above RPKM = 1 whereas enhanced regions have prior enrichment for either mark and gain at least 2-fold more enrichment upon occupancy. (c) Composite plots of ATAC-seq signal pre- and post-FOXA2 induction as well as after 10 days of DOX followed by 2 days withdrawal at regions that become accessible (left) and remain inaccessible (right) in BJFOXA2. (d) Differential motif analysis displayed as a bar plot using Homer for regions that become accessible versus regions that remain closed. (e) Mean enrichment of FOXA2 (RPKM) at regions that remain inaccessible versus those becoming fully accessible. Boxes indicate interquartile range and whiskers show maximum and minimum values. Outliers are removed. (f) Composite line plot of FOXA motif frequency across peak regions in those that become accessible (black) compared to the inaccessible set (grey). (g) Mean enrichment (RPKM) of pre-existing ATAC-seq signal at FOXA2 target site that remain closed and become open. Boxes indicate interquartile range and whiskers show maximum and minimum values. Outliers are removed. (h) Binned scatter plot for BJ peaks is pre-existing closed chromatin (ATAC RPKM >1) comparing ATAC-seq and H3K4me1, H3K4me2 or H3K27ac signal post- FOXA2 induction. Regions were binned based on ATAC signal and then mean ATAC and chromatin mark signal for each bin is plotted as dots. (i) Composite plot of H3K4me2 (black line) and H3K27ac (gray line) signal at all active promoter regions as defined by RNA-seq FPKM >3. (j) Cropped western blot analysis of FOXA2 and H3 protein as loading control after FOXA2 induction for 1 day and 10 days followed by 2 and 4 days of doxycycline withdrawal. Full western blot is shown in Supplementary Figure 9.
Supplementary Figure 6 FOXA2-deletion constructs
a) Schematic representation of the FOXA2 deletion constructs. (b) Cropped western blots corresponding to FOXA2 deletion constructs using V5 antibody and FOXA2 antibody. Full western blot is shown in Supplementary Figure 9. (c) Violin plots displaying mean methylation (of regions covered at least 3x in deletion construct data) in WGBS, FOXA2 wild-type or FOXA2 deletion conditions.
Supplementary Figure 7 FOXA2 occupancy and DNAme
(a) Oligomer probes were designed for electrophoretic mobility shift assay (EMSA) at the FOXA2 binding sites in the AFM genes as shown in the IGV browser track (chr4:74,263,092–74,395,230). Two oligo versions were synthesized for AFM (with and without a methylated CpG). Motif sequence is highlighted in red and CpG in blue. (b) EMSA using purified Halo-tagged FOXA2 protein demonstrates FOXA2 interacts equally with methylated, hemi-methylated and non-methylated oligomers. Competition experiments were performed with non-biotinylated oligomers at 10x and 100x the concentration of the biotinlyated oligomers. (c) Scatter plot of FOXA2 enrichment at class 3-1 regions compared to their change in DNAme. (d) Density plot capturing distance to nearest CpG from the summit of FOXA2 ChIP-sequencing peaks. Class 2, black. Class 3-1, blue. (e) Density plot capturing the percent methylation of the nearest CpG from the summit of FOXA2 ChIP-sequencing peaks. Class 2, black. Class 3-1, blue. (f) Average distance and methylation status to the nearest CpG from the peak summit. Statistical significance shown by Welch t-test. (g) Box plot shows the percent methylation of CpGs within 20bp windows from the summit of the peak extended 200 bp. Methylation measurements were taken from WGBS data prior to FOXA2 induction. Class 2, black. Class 3-1, blue. Boxes indicate interquartile range and whiskers show maximum and minimum values. Outliers are removed. (h) Density plot of ATAC-seq coverage 2 days after FOXA2 induction for class 2 (black) and class 3-1 (blue) target sites (left). Accompanying browser tracks on the right display FOXA2 ChIP-sequencing, BJ WGBS, FOXA2 ChIP-BS, and ATAC-seq prior to FOXA2 induction as well as 2 days following the induction. Class 2 region shown is chr12:54,011,044–54,012,658, and class 3-1 region shown is chr1:28,720,983–28,722,960. CpGs included in the analysis are shown in red and highlighted by a gray box. (i) Box plots displaying mean RPKM values of H3K4me2 (left) and H3K27ac (right) at class 3-1 compared to class 2 targets in pre- and post- FOXA2 induction conditions.
Supplementary Figure 8 Loss of DNAme is dependent on DNA replication
(a) CFSE time course signal for samples after 24 h and 48 h labeling plus/minus FOXA2 induction overlaid on Day 0 labeling time point. Bar plot shows the median CFSE signal for cells plus/minus Dox induction of FOXA2 over 4 days. (b) Venn diagram of the overlap shows high similarity in called peaks between the two samples. (c) IGV browser shot of a 589-kb genomic region (chr 20:52,141,443-52,731,602) in BJFOXA2-CDT1 mimosine-treated compared to two replicates of BJFOXA2 FOXA2 ChIP-seq during mimosine-halted and released conditions. (d) Scatter plot displaying FOXA2 enrichment value at BJ FOXA2 peak set for mimosine-halted BJFOXA2-CDT1 compared to mimosine-halted BJFOXA2 FOXA2 ChIP-seq. (e) Box plots show average methylation of all Class 3 in BJ WGBS, BJFOXA2 ChIP-BS and BJFOXA2-CDT1 ChIP-BS data. Regions shown had at least 10x coverage. Boxes indicate interquartile range and whiskers show maximum and minimum values. Outliers are removed.
Supplementary Figure 9 Full western blots
a) Full western blot of BJFOXA2 clonal cell lines from Fig. 1c. Part of the blot included in the main figure is boxed. (b) Full western blot of BJOCT4 and BJGATA4 lines from Supplementary Figure 2b. Part of the blot included in the main figure is boxed. (c) Full western blot of HNF1A soluble nuclear/ chromatin bound protein extracts from Supplementary Figure 3f. Part of the blot included in the main figure is boxed. (d) Full western blot of BJFOXA2 withdrawal conditions from Supplementary Figure 5h. Part of the blot included in the main figure is boxed. (e) Full western blot of FOXA2 deletion constructs from Supplementary Figure 6. Part of the blot included in the main figure is boxed. (f) Full western blot of FOXA2 and H3 in BJFOXA2-CDT1 in wild-type conditions, G1 block and G2/M block from Fig. 6e. Part of the blot included in the main figure is boxed.
Supplementary Text and Figures
Supplementary Figures 1–9.
Supplementary Table 1
Supplementary Table 2
Supplementary Table 3
Supplementary Table 4
Alignment of data.
Supplementary Table 5
Expression analysis uninduced versus FOXA2 induced.
Supplementary Table 6
Supplementary Table 7
FOXA2, G1 block ChIP-BS-seq.
Supplementary Table 8
FOXA2, replicating ChIP-BS-seq.
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Donaghey, J., Thakurela, S., Charlton, J. et al. Genetic determinants and epigenetic effects of pioneer-factor occupancy. Nat Genet 50, 250–258 (2018). https://doi.org/10.1038/s41588-017-0034-3
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