SUPPLEMENTAL INFORMATION
Titels and legends to 5 Supplemental Figures and 4 Supplemental Tables
5 Supplementary Figures
4 Supplementary Tables
SI METHODS
Titles and Legends to Supplemental Figures and Tables
Supplemental Figure 1. Definition of Hodgkin- and non-Hodgkin-specific accessible chromatin. (A) Examples of genes showing NH-specific (IGH, left) and HRS-specific (LTA,
TNF, right) increased chromatin accessibility. For details see legend to Fig. 1. (B) Definition of HRS- and NH-specific distal DHS-sets. The heat map on the left shows the L428 over Reh
DNaseI-Seq FC. HRS-(red) and NH-(green) specific DHSs, respectively, are represented on the bar next to the heat map and are defined by statistical thresholds corresponding to 2! significance. Non-varying genes are represented in black. The panels next to the bar show the average DNaseI-Seq profiles for each group indicating an average peak width of about 200 –
400 bp. Outermost right, box plot demonstrating that the differences in DNaseI-Seq FC for
NH-(green) and HRS-(red) specific DHSs are significant (***, p < 2.2*10-16). (C) Changes in chromatin accessibility correspond to changes in mRNA expression levels in HRS as compared to the NH cell lines. The L428 over Reh increasing DNAseI FC in distal elements depicted on the heat map on the left is correlated with the FC of mRNA expression of the nearest gene of multiple HRS cell lines compared to the NH cell line Reh. Spearman rank correlation coefficients are 0.71, 0.57, 0.52, 0.49, 0.53, 0.5, respectively. (D) Changes in chromatin accessibility at distal elements correspond to changes in mRNA expression levels compared to different NH cell lines. Comparison of FC in mRNA expression in multiple HRS cell lines compared to the NH cell lines Namalwa (left panel; Spearman rank correlation coefficients are 0.68, 0.62, 0.62, 0.63, 0.76, 0.61, respectively) or SU-DHL-4 (right panel; Spearman rank correlation coefficients are 0.58, 0.48, 0.58, 0.49, 0.71, 0.47, respectively) with DNaseI-Seq FC L1236 versus Reh as base line. (E) Box plots depicting the overall correlation in mRNA expression FC in different HRS cell lines over Reh of genes nearest to sites with low (NH-specific sites, green) and high (HRS-specific sites, red) L428 over Reh
DNaseI-Seq FC, revealing consistently up- and down-regulated genes common to all HRS cell lines. (F,G) Changes in chromatin accessibility inversely correlate to changes in methylation levels between NH and HRS cell lines. Direct comparison of the fold increase in
DNaseI accessibility for the L1236 and L428 HRS cell lines relative to the NH cell line Reh with the DNA-methylation pattern in the corresponding promoter regions as described in Fig.
1. The heat maps show the (F) L1236 over Reh and (G) L428 over Reh DNaseI FC sorted by increasing DNaseI ratio and corresponding methylation FC of the associated TSSs for promoter (left) and distal (right) DHSs in the indicated cell lines. Spearman rank correlation coefficients are: (F) L1236/Reh DHS vs. expr./m5C 0.707/-0.603 (promoters), and 0.723/-
0.45 (distal elements); (G) L428/Reh DHS vs expr./m5C 0.833/-0.671 (promoters), and
0.717/-0.346 (distal elements).
Supplemental Figure 2. Transcription factor binding motifs enriched in HRS- or NH- specific DHSs are centered around the DHS center. (A,B) Alignment of motifs in the different classes of distal DHSs (A, B, or C) with the DHS center for NH and HRS motifs in total L428 and Reh genes. Each heatmap represents the position, in yellow, of NH (left panels) and HRS (right panels) enriched motifs with respect to the maximum DNaseI-Seq signal within +/-200 bp, sorted by increasing (A) L1236 or (B) L428 over Reh DNaseI FC.
(C,D) Plots depicting average motif densities +/-200 bp around each DHS maximum for (C)
L1236 and (D) L428 versus Reh. Enriched motifs in HRS-specific DHSs are shown in red, shared DHSs in black, and motifs in NH-specific DHSs are depicted in green. (E) Binding motifs enriched in HRS-specific DHSs co-localize with NF-!B. Distribution of distances between AP-1, STAT and IRF motifs with regard to the position of the NF-!B motif in the union of L1236 over Reh distal regions. In each case, motifs exhibit preferentially proximal positioning in relation to the NF-!B motif. For STAT motifs, a preferential position was found at +7 bases from the start of the NF-!B site, thus forming a
GGGGAWTTCCNNAGAA composite consensus.
Supplemental Figure 3. Quantification of IRF5 mRNA levels by real-time PCR; increased chromatin accessibility and transcriptional activity at the IRF5 locus; detection of IRF5 protein-DNA complexes in HRS cells; IRF5 IHC analyses. (A) mRNA expression of IRF5 in various Hodgkin (L428, L1236), non-Hodgkin (Reh, Namalwa) as well as ABC-type- (OCI-Ly3, OCI-Ly10, HBL1, TMD8) and GCB-type- (HT, OCI-Ly1, OCI-
Ly7, OCI-Ly19) DLBCL cell lines was analyzed by quantitative real-time PCR relative to
GAPDH mRNA expression. Error bars denote 95% confidence intervals. (B) DNaseI-Seq profiles in the IRF5 gene locus reveal elevated DNaseI-accessibility as well as the usage of an alternative promoter in HRS cell lines. IGV screenshot of DNaseI-Seq profiles of the IRF5 gene locus in HRS and NH cell lines, as indicated on the left. HRS (L1236, L428 and L591; red) and NH (Namalwa and Reh; green) DNaseI-seq profiles are shown above the IRF5 gene annotation (black), where both TSSs (TSS1 and 2) are represented by red arrows, and correspond to phylogenetically conserved regions (blue, bottom). RefSeq annotations are shown underneath all profiles, where thin lines represent introns, thick blocks exons and thickest blocks coding sequences. Gene transcription direction is shown by arrows. Note, that the DNaseI-Seq signal upstream of TSS1 as well as in the corresponding 1st intron is higher in
HRS compared to NH cell lines, while TSS2 exhibits equivalent levels. (C-E) Epigenetic and transcriptional signatures of the IRF5 locus in the HRS cell lines L428 and L591 and the NH cell lines Reh and Namalwa, as indicated. One of three independent experiments is shown, respectively. Chromatin immunoprecipitation (ChIP) assay measuring (C) H3K4me3, (D) RNA PolII P-Ser5 (upper panel) and RNA PolII P-Ser2 (bottom panel) and (E) H3K9me3 at the indicated positions of the IRF5 locus, revealing higher enrichment for H3K4me3 as well as paused and elongating RNA PolII in the HRS cell lines at both TSSs. Histone modification marks and RNA PolII enrichment levels are shown as percentages of those of input or H3, respectively. (F) Northern blot analysis of IRF5 mRNA expression in HRS and NH cell lines, as indicated. GAPDH expression was analyzed as a control. (G-I) EMSA analyses of whole cell extracts using wt and mutated ISRE sites from the ISG15 promoter as a probe. (G) EMSA analysis of whole cell extracts of various HRS and NH cell lines, as indicated, using the wild- type ISRE site (ISRE wt) or an ISRE site with mutated IRF binding site (ISRE mut) as probe.
Positions of specific protein-DNA complexes are indicated. n.s., non-specific complex. The free probe of the gel using ISRE wt as probe is shown underneath. Note, that IRF5-containing complexes are detectable only in HRS cell lines, that mutation of the ISRE site results in the loss of the IRF-containing complexes but not the non-specific complexes, that IRF5- containing complexes are selectively detectable in HRS cell lines and that the complex detectable in Reh cells (marked by an open circle) does not react with the IRF5 antibody.
(H,I) EMSA analysis of whole cell extracts of the indicated cell lines using the (H) ISRE wt or (I) mutated site from the ISG15 promoter as a probe. Positions of specific protein-DNA complexes without (-) or with addition of IRF5 antibody (IRF5) or its isotype control (IC) are indicated (supershift, ss). n.s., non-specific complex. The free probe of the gel is shown underneath. Note, that in (I) mutation of the IRF5 site results in the loss of the IRF-containing complexes but not the non-specific complexes. (J) IRF5 immunohistochemistry of reactive tonsillar tissue (top panel), a tonsil from an infectious mononucleosis patient (center) and an
IRF5-negative DLBCL case (bottom panel). Note, that in reactive tonsillar tissue IRF5 was detectable in some dendritic cells and macrophages.
Supplemental Figure 4. IRF5 is required for the HRS cell-characteristic inflammatory gene expression and for HRS cell survival. (A) TFs IRF5 and NF-!B are required for endogenous IL13, IL6 and RANTES mRNA expression in HRS cell lines. The HRS cell line
L591 was transfected with control plasmid (Mock) or a dominant-negative variant of IRF5
(DNIRF5-4D) and/or the NF-!B super-repressor I!B"#N, respectively. Enriched transfected cells were analyzed for mRNA expression of IL13, IL6 and RANTES by real-time PCR. Error bars denote 95% confidence intervals. One of six experiments is shown. P-values are shown for the comparisons to the respective Mock control. (B) The HRS cell lines L540Cy and L591 were transfected with control plasmid (Mock), or plasmids encoding a dominant-negative variant of IRF5 (DNIRF5-4D) and/or the NF-!B super-repressor I!B"#N, respectively. After enrichment of transfected cells, whole cell extracts were prepared and protein expression of
DNIRF5-4D and I!B"#N was analyzed by use of antibodies (Ab) specific for IRF5 and
I!B", respectively, as indicated. Extracts of L428 and Namalwa cells and the analysis of $- actin were included as controls. (C) Measurement of secreted RANTES and IL-6 by ELISA of supernatants derived from Mock, and DNIRF5-4D and/or I!B"#N transfected L540Cy and L591 cells. Cells were prepared as described in Fig. 3F. Following purification, cells were re-cultured for additional 24 hours and supernatants were analyzed by an IL6- and
RANTES-specific ELISA. The amounts of IL-6 and RANTES are shown in pg/ml. Error bars denote SDs. One of three independent experiments is shown. p-values are shown for the comparisons to the respective Mock control. (D) The HRS cell line L591 was transfected with control siRNA constructs (siCTL) or siRNA-constructs targeting IRF5 (siIRF5_#1 and siIRF5_#2) along with pEGFP-expression constructs. 72 hours after transfection, GFP- positive cells were enriched and further cultured for the indicated times. The percentage of viable, GFP-positive cells was determined at the indicated times and is shown in relation to the viability of siCTL-transfected cells, which was set 1.0. Data are represented as mean +/- SD. One of four independent experiments is shown. P-values are shown for the comparisons to the siCTL sample at the indicated times, respectively. (E) The HRS cell lines L428,
L540Cy, and L591 were transfected with control siRNAs (siCTL) or siRNAs targeting IRF5
(siIRF5_#1 and siIRF5_#2) along with pEGFP. 72 hours after transfection, GFP-positive cells were enriched and whole cell extracts were analysed for IRF5 protein expression by WB.
Extracts of L428 and Reh cells and the analysis of !-actin were included as controls. (F)
Detection of apoptosis in transfected L540Cy HRS cells following IRF5 knock-down. The
HRS cell line L540Cy was transfected with control siRNA constructs (siCTL) or siRNA- constructs targeting IRF5 (siIRF5_#2) along with pEGFP-expression constructs. 48 hours after transfection, GFP-positive cells were enriched, and 48 hours after enrichment cell were analyzed for apoptosis by annexin V-APC/PI staining and flow cytometry. The percentage of apoptotic, annexin V-APC-positive and PI-negative cells is indicated. One of four independent experiments is shown. (G) Cells were treated as described in (F). 48 hours after enrichment, intracellular staining for active caspase-3 was performed. The percentage of active caspase-3-positive cells is shown. One of four independent experiments is shown.
Supplemental Figure 5. IRF5 is required for HRS-specific gene expression. (A) IRF5 and
NF-"B synergistically activate the RANTES promoter (P) in HEK 293 cells. Upper panel, analysis of luciferase activity of RANTES P constructs. pGL3-basic (negative control), pGL3-
RANTES P wild type (WT) or pGL3-RANTES P constructs with mutated ISRE (ISRE mut) or mutated NF-"B (NF-"B mut) DNA binding motifs were transiently transfected into HEK293 cells together with Mock plasmid (control) or expression plasmids for IRF5-4D and/or
IKK!(EE). Luciferase activity is shown as fold activation compared to pGL3 basic activity
(set as 1). Data are represented as mean ± SD. One of six experiments is shown. P-values are shown for comparisons to the respective Mock controls. Lower panel, 48 hours after transfection of HEK293 cells, whole cell extracts were prepared and protein expression of IRF5-4D and IKK!(EE) was analyzed by use of antibodies (Ab) specific for IRF5 and FLAG, respectively, as indicated. Extracts of L428 and Namalwa cells and the analysis of !-actin were included as controls. (B) Upper panel, measurement of secreted IL-6 and RANTES by
ELISA of supernatants derived from Mock, and IRF5-4D and/or IKK!(EE) transfected BJAB cells. Cells were prepared as described in Fig. 4B. Following purification, cells were recultured for additional 24 hours and supernatants were analyzed by IL6- and RANTES- specific ELISAs. The amounts of IL-6 and RANTES are shown in pg/ml. Error bars denote
SDs. One of four independent experiments is shown. P-values are shown for comparisons to the respective Mock controls. Lower panel, the NH cell lines BJAB and Reh were transiently transfected with control plasmids (Mock), or, alone or in combination, expression constructs encoding constitutively active variants of IRF5 (IRF5-4D) and IKK! (IKK!(EE)). After enrichment of transfected cells, whole cell extracts were prepared and protein expression of
IRF5-4D and IKK!(EE) was analyzed by use of antibodies (Ab) specific for IRF5 and FLAG, respectively, as indicated. The whole cell extract of L1236 HRS cells and the analysis of !- actin were included as controls. (C) GSEA enrichment plots of the primary HRS cell line mRNA signature of up-regulated genes (see Table S3; signature based on the comparison of primary HRS cells versus FL, BL, DLBCL (1), log2 FC cut-off 1) of IRF5-4D-, IKK!(EE)- or
IRF5-4D- and IKK!(EE)-induced gene expression changes in transiently transfected Reh cells, as indicated. The Java implementation of GSEA version 2.0.12 was used, taking the signal-to-noise ratio of log2-transformed expression values for gene-ranking. Note, that the absolute value of the normalized enrichment score (NES) is highest in the IRF5-4D plus
IKK!(EE) sample. This is indicative of an additive or synergistic effect of the two factors with respect to a Hodgkin-like phenotype shift of the Reh cell line. (D) GSEA analysis of
IRF5-4D-transduced primary murine B cells. Primary murine splenic B cells from wild-type
C57BL/6 mice were purified by MACS CD43-depletion, stimulated with LPS and retrovirally transduced with either Mock (Mock; MSCV-IRES-CFP) or IRF5-4D (IRF5-4D; MSCV-
IRF5-4D-IRES-CFP) viruses. After 72 hours, transduced CFP-positive cells were enriched by
FACS. GSEA enrichment plots of the IRF5-4D-induced gene expression changes, determined by microarray analyses, of the primary HRS cell signature for down- (left panel) and up-(right panel) regulated genes (see Table S3) are shown, respectively. Note, that IRF5-4D expression leads to a highly significant and specific shift of murine splenic B cells to a Hodgkin-like phenotype. (E) Murine splenic B cells were treated as described in Fig. 5A. Whole cell extracts were analyzed for IRF5 protein expression by WB. Expression of !-actin is shown as a control. Note, that expression of IRF5 in transduced murine B cells is comparable to the endogenous IRF5 expression in the HRS cell lines L428 and L1236. ns, not significant; *, p <
0.05; **, p < 0.01; ***, p < 0.001.
Supplemental Table 1. DNaseI digestion conditions and high-throughput sequencing statistics for HRS and NH cell line DNaseI-Seq analyses.
Supplemental Table 2. IRF5 protein expression analysis in sections of Hodgkin and non-
Hodgkin B cell lymphoma. B-CLL, B-cell chronic lymphocytic leukemia. *, including 10 molecularly characterized ABC-type- and GCB-type DLBCL cases, respectively. **, 3 GCB- type DLBCL cases and 1 ABC-type DLBCL case. ***, ABC-type DLBCL.
Supplemental Table 3. Gene lists of differentially expressed genes between HRS and NH cell lines (Köchert et al., Oncogene, 2011; GEO acc. no. GSE20011) and between primary
HRS and primary B-NHL samples (Tiacci et al., Blood, 2010; GSE12453).
Supplemental Table 4. Primers and oligonucleotides used for semiquantitative RT-PCR, real-time PCR and EMSA analyses. !"##$%&%'()*+ ,-."*% /
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ISRE mut n.s. free probe 2 a H 2 - lw H 1 M a - 9 L m h M 5 D a e cell line K L H N R 5 5 5 5 5 F F F F F ss IR IC IR IC IR IC IR IC IR IC C ss H3K4me3 35 Reh e IRF5 v i Namalwa t a 3 l 25 L428 n.s. e e r L591 n t o n t e s i 15 free m h h probe o c t i r n E 5 a -4 w L 0 6 l H 8 3 0 a D L b b 1 2 b R I 2 2 4 m - V k k S S k 4 1 5 a U I 9 0 7 T cell line L L L N S 2 1 S S + ´U - - T T 3 5 5 5 5 5 F F F F F D ss IR IC IR IC IR IC IR IC IR IC RNAP II P-Ser5 45 Reh Namalwa t n.s. u t 35 L428 p n n i L591 e o m free t h 25 e c probe i v r i t n a l E 15 e r 5 J tonsil 0 b b b 1 b 2 b R g k k k S k S k T b 9 0 5 S 6 7 2 1 . . S + ´U - - -7 T -2 T 3 RNAP II P-Ser2 1.2 Reh Namalwa 1 t L428 u t p n L591 n 0.8 i e o m t h 0.6 e c i IM v r i t n 0.4 a l E e r 5 0 b b b 1 b 2 b R g k k k S k S k T b 9 0 5 S 6 7 2 1 . . S + ´U - - -7 T -2 T 3 E H3K9me3 Reh e DLBCL v i Namalwa t 6 a 3 l L428 e e r L591 n 4 t o n t e s i 2 m h h o c t i r 0 n L b b b E 1 2 R V k k S S k I 9 0 7 T 2 1 S S + ´U - - T T 3 Supplementary Figure 4 A D L591 IL13 IL6 RANTES 1.2 s l L 1.4 l 1.0 T A e e c C N v i L591 h t ns n + R 0.8 s a 1.0 * o l * P * siCTL i * m * o e * s F t * * r siIRF5_#1 s * H ** 0.6 * G * * e e e D * r 0.6 * *** v siIRF5_#2 n e i i l p P t k *** 0.4 b x a A ** l o a e t i e G r y 0.2 *** V c 0.2 o *** t 0 Mock + + + 0 DNIRF5-4D hours after + + + + + + 0 96 144 I"B#$N + + + + + + cell sorting B E L428 1 2 # # _ _ 5 5 8 L F F L540Cy L591 2 h T R 4 e iC iIR iI cell type L R s s s + + D D D D a -4 -4 a -4 -4 IRF5 w 5 5 w 5 5 l N F N l N F N a k F $ $ a k F $ $ 8 m c IR # IR # 8 m c IR # IR # 2 a o N B N B 2 a o N B N B !-actin cell type 4 " " 4 " " L N M D I D I L N M D I D I Ab IRF5 IRF5 L540Cy L591 DNIRF5-4D 1 2 1 2 I B # # # # " # I"B# _ _ _ _ L 5 5 L 5 5 I"B#$N 8 T F F T F F 2 h R R R R 4 e iC iI iI iC iI iI !-actin !-actin cell type L R s s s s s s IRF5 !-actin C F siCTL siIRF5_#2 5 5 L540Cy L591 ) 10 7.5% 10 20.9% C P 4500 2500 A 4 4 ( 10 10 V - n S 3 3 i ) l 3000 10 10 x E ** ** 1500 e m T / ** * n N g * n 102 102 p A * A ( 1500 R 500 102 103 104 105 102 103 104 105 0 0 PI 450 500 G 400 siCTL siIRF5_#2 ) l 300 400 6 300 m - ** / 300 L g I p 4.4% 14.1% ( 200 300 150 *** *** s 200 *** 100 ****** t n 200 u o 0 0 c 100 100 Mock + + DNIRF5-4D + + + + I"B#$N + + 0 0 + + 102 103 104 102 103 104 active caspase-3 (APC) Supplementary Figure 5 A B * 900 * * * * 9 * * y t ) i BJAB BJAB n v i t o 6 i c t * * a a * 600 * 180 * 600 * v * S i 3 * e ) ) t l l s E c 6 a * m 120 m 400 T a - / / r * * 0 L N g g e d I f l i p p A 300 ( ( o c 60 200 f R ( u * * L * * * * ns * * 0 0 Mock + Mock + 0 + + + + Mock + + + IRF5-4D IRF5-4D + + IRF5-4D + + + + + + IKK!(EE) IKK!(EE) + + IKK!(EE) + + + + + + reporter 3 3 3 L L L G G G BJAB Reh p WT p ISRE p NF-"B mut mut ) + ) ) + ) D E D E D E D E 6 -4 (E -4 (E -4 (E -4 (E 3 k 5 k 2 c 5 ! ! c 5 ! 5 ! 1 o F K F K o F K F K HEK293 cell type L M IR IK IR IK M IR IK IR IK Ab a ) + ) IRF5 IRF5 w D E D E l -4 (E -4 (E 8 a k 5 2 m c 5 ! ! IKK!(EE) 4 a o F K F K cell type L N IR IK IR IK Ab FLAG M IRF5 IRF5 IRF5 !-actin !-actin IKK!(EE) FLAG !-actin !-actin C