anti arnt hif 1β monoclonal antibody  (Novus Biologicals)

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analysis for HIF-2α mRNA in tissue lysates from renal tumors or corresponding normal kidney tissue from the Erlangen RCC cohort (ccRCC: clear cell renal carcinoma [ n = 114], pRCC: papillary renal cell carcinoma [ n = 16], chRCC: chromophobe renal cell carcinoma [ n = 11]). Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. b RNA-seq expression values for HIF-2α in different renal tumors and corresponding normal kidney tissue from the TCGA KIRC ( n = 72), KIRP ( n = 31) and KICH ( n = 23) data sets. Median and interquartile range. P -values were determined by two-way ANOVA followed by Bonferroni’s post hoc test. c RNAscope experiment for HIF-2α mRNA in ccRCC tissue. Arrows indicate HIF-2α mRNA transcripts in tumor cells. V = vessel. Scale bars, 100 µm or 75 µm as indicated. Representative image from independent samples of seven different patients with similar results. d Log 2 fold change of HIF-related genes in snRNA-seq data comparing tumor cells from 30 ccRCC samples versus proximal tubule (PT) cells from four adjacent kidney tissue samples . Only samples with significantly differentially expressed transcripts are shown (adjusted p < 0.05, average log 2 fold change ≠ 0). e Isolation of renal tumor cells and corresponding tubule cells from non-diseased tissue of tumor nephrectomy specimens. Created in BioRender. Naas, S. (2025) https://BioRender.com/c87s173 . f Immunoblot analyses for HIF-1α, HIF-2α, pVHL, and β-actin in lysates from primary tubule (PTC) and tumor (ccRCC) cells isolated from tissue specimens of patient #1. Representative blot from 19 independent experiments with similar results. g Expression qPCR analysis for HIF-2α mRNA in lysates from primary tubule cells (PTC) and primary tumor (ccRCC) isolated from 34 different individuals. Graph shows median with interquartile range and p -values from a two-tailed unpaired t-test.

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: Expressing, RNA Sequencing, RNAscope, Isolation, Western Blot, Two Tailed Test

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Sequencing tracks from ATAC- and H3K27ac ChIP-seq experiments performed in cells from patient #1 at the EPAS1 locus. Activity-by-contact (ABC) analysis was used to predict enhancer-promoter interactions. Additionally, tracks from published data from Capture-C experiments in 786-0 cells , gained enhancer activity in ccRCC (ccRCC-enhancer) , ccRCC cancer-cell specific differentially accessible regions (ccRCC-specific DACR) as determined by snATAC-seq , KIRC hypomethylated CpGs (Beta-value cutoff 0.25, adjusted p -value cutoff 0.01) and KIRC-specific ATAC-seq elements are shown . b Differentially active enhancer regions on chromosome 2 in ccRCC tumors from Yao et al . Average log 2 fold chance (H3K27ac signal, ten tumors vs corresponding normal tissue) and -log 10 adjusted p -value are shown. Significantly regulated elements (adjusted p < 0.05, light blue) that overlap KIRC-specific ATAC sites are depicted in dark blue. Sites highlighted in red overlap KIRC-specific sites, show a positive log 2 fold change and are localized within 5 Mb of the EPAS1 gene. Enhancer enh-1031503 covers elements KIRC_10767-KIRC_10770. For comparison, the H3K27ac signal at the EPAS1 promoter is marked, but not significantly regulated. c ATAC-seq tracks for the different TCGA tumor entities at the ccRCC-enhancer site with gained activity in ccRCC . KIRC specific ATAC-seq sites 10767-70 are indicated above the tracks. d Spearman’s rank correlation analysis of HIF-2α mRNA expression (TPM: transcripts per million) and accessibility at KIRC_10770 in the KIRC data set. Values are from samples for which both analyses were available ( n = 16 different tumors). Gray region depicts 95% confidence interval. Significance was assessed with a two-sided t-approximation test.

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: Sequencing, ChIP-sequencing, Activity Assay, Capture-C, Comparison, Expressing

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a RSEM-normalized RNA-seq values for HIF-2α in the TCGA KIRC cohort stratified for VHL copy number alterations (diploid n = 38, deletion n = 309). P -values were determined by an unpaired, two-tailed t-test. b RT-qPCR analyses for HIF-2α mRNA in RCC4 cells with or without functional pVHL. Graph shows mean + SD. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. n = 4 independent experiments. c Representative immunoblot ( n = 2) for HIF-1α, HIF-2α, hemagglutinin (HA), and β-actin in lysates from RCC4/i.VHL-HA cells exposed to 0.5 µg/ml doxycycline to induce pVHL for the indicated time. d RT-qPCR analyses for HIF-2α mRNA in lysates from RCC4/i.VHL-HA cells treated with 0.5 µg/ml doxycycline for the indicated time. Expression values are mean + SD from three independent experiments. Significance was tested by a two-tailed one sample t-test with a hypothetical value of 1. e Expression qPCR analysis for HIF-2α mRNA in lysates from RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Mean + SD from 7 independent experiments. Differences were assessed by a two-tailed one sample t-test with a hypothetical value of 1. f RT-qPCR analysis for HIF-2α mRNA in lysates from 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Graph shows mean + SD from 5 independent experiments. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. g Representative immunoblot ( n = 2) for HIF-2α, HIF-1α, HIF-1β, and β-actin from lysates of RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. h Representative immunoblot ( n = 2) for HIF-2α, HIF-1β, and β-actin from lysates of 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. i ATAC-seq tracks at the ccRCC-activated enhancer in RCC4/i.VHL-HA cells as well as single clones of HIF-1β knock-out or nt control RCC4 or 786-0 cells, respectively. RCC4/i.VHL-HA were exposed either to 0.5 µg/ml doxycycline (Dox +) or to DMSO control (Dox -) for 18 h. The ATAC element KIRC_10770 is highlighted in orange. j H3K27ac CUT&Tag tracks from the same cells at the same genomic region as in i ).

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: RNA Sequencing, Two Tailed Test, Quantitative RT-PCR, Functional Assay, Western Blot, Expressing, Transfection, Control, CRISPR, Clone Assay, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analyses for HIF-2α mRNA in lysates from 105 isolates of primary tubule cells (PTC) exposed to 1 mM DMOG or control conditions for 16 h. Values are mean +/− SD from n = 105 independent experiments. Unpaired, two-tailed t-test. b Expression qPCR for HIF-2α mRNA in lysates from PTC depleted for HIF-1α or HIF-1β using siRNA and stimulated with or without 1 mM DMOG for 16 h. Non-targeting (nt) control siRNA was used as control. Values are mean + SD. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. Data is from nine independent experiments using PTC from nine different individuals. c HIF ChIP-seq tracks from lysates of primary tubule cells (PTC, green) treated with 1 mM DMOG for 4 h and ccRCC cells (blue) at the PRKCE-EPAS1 locus. ChIP-seq track for the activity marker H3K27ac in isolated ccRCC cells from patient #1 and hypomethylated CpGs in TCGA KIRC are also shown. KIRC-specific polymorphisms identified by the Cis-eQTL PancanQTL analysis as an eQTL for EPAS1 expression are indicated . Germline variants associated with renal cancer development within the EPAS1 -coding region are shown (RCC risk SNP) , . d Correlation of rs12617313 genotype and HIF-2α mRNA expression in the KIRC TCGA normal tissue and tumor data. Number of samples for normal tissue: Genotype TT n = 19, AT n = 25, AA n = 16. Number of samples for tumor tissue (KIRC): Genotype TT n = 94, AT n = 188, AA = 121. Data shown are median and interquartile range. χ 2 -test; p -value as indicated for higher expression in AA individuals compared with TT individuals. e Genotype-expression correlation for rs12617313 and HIF-2α mRNA in PTC exposed to 1 mM DMOG for 16 h or left untreated. Number of samples for each genotype: TT n = 26, AT n = 58, AA n = 21. Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test.

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: Expressing, Control, Two Tailed Test, ChIP-sequencing, Activity Assay, Marker, Isolation

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a ChIP-seq tracks for HIF-1β, PAX8 , H3K27ac and HNF-1β CUT&Tag-seq track from 786-0 cells at EPAS1 -enhancer E2. Binding sites for HNF-1β (E2_HNF-1β) and PAX8 (E2_PAX8) within KIRC_10767 are highlighted in blue. HIF-binding site is marked in orange. b Expression qPCR analyses for HIF-2α mRNA in lysates from 786-0 cells depleted for the indicated transcription factor (HNF-1β or PAX8). Values are mean + SD from 5 (HNF-1β) or 4 (PAX8) independent experiments. Statistical significance was assessed by a two-tailed one sample t-test with a hypothetical value of 1. c Immunoblot analyses for HIF-2α, HNF-1β, and β-actin in lysates from 786-0 cells depleted for HNF-1β using CRISPR/Cas9. Representative blot from two independent experiments with similar results. d Immunoblot analyses for HIF-2α, PAX8, and β-actin in lysates from 786-0 cells depleted for PAX8 using CRISPR/Cas9. Representative blot from two independent experiments with similar results. e ATAC-seq and CUT&Tag-seq tracks of the chromatin activity marker H3K27ac from single clones of HNF-1β knock-out, PAX8 knock-out or control (nt) clones of 786-0 cells at EPAS1 -enhancer E2. The ATAC KIRC element 10767 harboring binding sites for HNF-1β and PAX8 is highlighted in blue, the HIF-1β binding site at KIRC_10770 is marked in orange. f Schematic depiction of transcription factor binding sites for HNF-1β, PAX8 and HIF-1β at EPAS1- enhancer E2. Positions of sgRNAs used for knock-out of the respective binding sites are indicated in orange. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . g Expression qPCR analysis for HIF-2α mRNA in pools of 786-0 cells transfected with sgRNA targeting the HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) binding site at the EPAS1- enhancer E2. Cells treated with non-targeting sgRNA served as controls. Values are mean + SD. p -values were determined by a two tailed one sample t-test with a hypothetical value of 1. n = 5 (E2_HNF-1β) or n = 6 (E2_PAX8) independent experiments. h Immunoblot analyses for HIF-2α and β-actin in 786-0 cells with intact (nt) or mutated binding sites for HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) at the EPAS1 -enhancer E2. Representative blot from two independent experiments with similar results.

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: ChIP-sequencing, Binding Assay, Expressing, Two Tailed Test, Western Blot, CRISPR, Activity Assay, Marker, Clone Assay, Knock-Out, Control, Transfection

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Schematic of the two HIF-binding EPAS1 -enhancers E1 and E2 at the PRKCE-EPAS1 locus. The location of HIF-binding motifs and positions of sgRNAs within the KIRC elements are indicated. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . b Expression qPCR for HIF-2α mRNA in lysates from primary ccRCC cells isolated from 4 different tumor nephrectomies transfected with a pool of sgRNAs directed against the HIF-binding-sites at EPAS1 -enhancer 1 (E1) and EPAS1 -enhancer 2 (E2_HIF) or a control sgRNA (nt). Values are mean + SD from 4 independent experiments. Significance was determined by a two tailed one sample t-test with a hypothetical value of 1. Expression qPCR for HIF-2α mRNA in lysates from 786-0 ( c ) or RCC4 ( d ) cells transfected with sgRNAs targeting EPAS1 -enhancer 1 (E1), the HIF-binding site of EPAS1 -enhancer 2 (E2_HIF) or both enhancers (E1 + E2_HIF). nt = non-targeting control sgRNA. Values are mean + SD from independent experiments (786-0: n = 7 for nt; n = 6 for E1 and E2_HIF; n = 5 for E1 + E2_HIF; RCC4: n = 4 for nt and E1 + E2 HIF; n = 3 for E1 and E2_HIF). Significance was tested by a two tailed one sample t-test with a hypothetical value of 1. Immunoblot analyses for HIF-2α and β-actin protein in lysates from 786-0 ( e ) or RCC4 ( f ) cells transfected with sgRNAs targeting the enhancers as indicated. Representative blot from three (786-0) or two (RCC4) independent experiments with similar results. Gene set enrichment analysis for differentially expressed genes comparing RNA-seq data generated in 786-0 ( g ) or RCC4 ( h ) cells transfected with sgRNA targeting E2_HIF or non-targeting control guides (nt). One RNA sample of each condition was sequenced in technical duplicates. i Comparison of log 2 (fold change) expression values of genes significantly regulated upon E2_HIF knock-out in 786-0 or RCC4 cells. HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. One RNA sample of each condition was sequenced in technical duplicates.

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: Binding Assay, Expressing, Isolation, Transfection, Control, Two Tailed Test, Western Blot, RNA Sequencing, Generated, Comparison, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Representative immunoblot ( n = 3) for HIF-2α and β-actin protein in lysates from single clones of EPAS1 -enhancer 2 defective (E2_HIF) or control (non-targeting, nt) 786-0 cells. b Xenograft tumor assay in NOD/SCID-gamma mice using EPAS1 -enhancer 2 defective (E2_HIF ko) or intact (nt) clones of 786-0 cells. Volume values are mean ± SD from 6 tumors per cell clone. Two-way ANOVA followed by Bonferroni’s post hoc test comparing tumor volume between mean nt and E2_HIF ko at the indicated time points. Significant differences (** p < 0.01) were detected for comparisons between mean values of E2_HIF ko (2.1 or 2.2) with nt (0.1 or 0.2) xenografts for weeks 8, 9 and 10. c Weight of the explanted xenograft tumors. Data shown are median and interquartile range from 5 (E2_HIF 2.1) or 6 (nt 0.1, nt 0.2, E2_HIF2.2) tumors. One-way ANOVA followed by Bonferroni’s post hoc test. d Volcano plot from RNA-seq experiments in E2_HIF ko versus nt clones of 786-0 cells. HIF-2α mRNA as well as HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. Data is from the two clones of cells per condition from a) and b). e GSEA for HIF-binding sites in 786-0 cells and RNA-seq data ( n = 2 clones) from d). DEG: differentially expressed genes, ES: enrichment score. p -value was estimated using adaptive multilevel Monte Carlo scheme and adjusted for multiple testing with the Benjamini–Hochberg method. f CUT&Tag-seq (C&T) for HIF-1β and H3K27ac as well as ATAC-seq at EPAS1 -enhancer 2 and the control locus EGLN3 from E2_HIF ko versus nt clones of 786-0 cells. g CUT&Tag-seq signals for HIF-1β or H3K27ac integrated over 543 ChIP-seq pre-defined HIF1-β binding sites in E2_HIF ko versus nt clones of 786-0 cells. Non-HIF binding enhancers served as control. Signals were centered on the H3K27ac peak within the enhancers. h Comparison of log 2 (fold change) expression values of genes significantly regulated in E2_HIF ko 786-0 cells ( n = 2 clones) or through HIF-2 inhibition by PT2385 in 786-0 cells . HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. i The transcriptional circuitry of HIF-2α expression at the EPAS1 gene locus. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 .

Article Snippet: Rabbit polyclonal anti-HIF-1α antibody (Cay10006421, rabbit polyclonal, Cayman Chemicals, Ann Arbor, MI, USA; dilution: 1:1,000) and monoclonal mouse anti-HIF-1α antibody (610959, BD Biosciences, New Jersey, USA; dilution: 1:500), goat polyclonal anti-HIF-2α antibody (AF2997, R&D Systems, Minneapolis, USA; dilution: 1:250) and rabbit monoclonal anti-HIF-2α antibody (A700-003, Bethyl, Waltham, USA; dilution: 1:1,000) as well as rabbit polyclonal anti-HIF-1β antibody (NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany; dilution: 1:1,000), monoclonal rat anti-hemagglutinin (HA) antibody (11867423001, Roche Diagnostics GmbH, Mannheim, Germany; dilution: 1:1,000) and polyclonal rabbit anti-VHL antibody (68547, Cell Signaling Technology, Danvers, MA, USA; 1:1,000) were applied for protein detection as applicable.

Techniques: Western Blot, Clone Assay, Control, RNA Sequencing, Binding Assay, ChIP-sequencing, Comparison, Expressing, Inhibition

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analysis for HIF-2α mRNA in tissue lysates from renal tumors or corresponding normal kidney tissue from the Erlangen RCC cohort (ccRCC: clear cell renal carcinoma [ n = 114], pRCC: papillary renal cell carcinoma [ n = 16], chRCC: chromophobe renal cell carcinoma [ n = 11]). Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. b RNA-seq expression values for HIF-2α in different renal tumors and corresponding normal kidney tissue from the TCGA KIRC ( n = 72), KIRP ( n = 31) and KICH ( n = 23) data sets. Median and interquartile range. P -values were determined by two-way ANOVA followed by Bonferroni’s post hoc test. c RNAscope experiment for HIF-2α mRNA in ccRCC tissue. Arrows indicate HIF-2α mRNA transcripts in tumor cells. V = vessel. Scale bars, 100 µm or 75 µm as indicated. Representative image from independent samples of seven different patients with similar results. d Log 2 fold change of HIF-related genes in snRNA-seq data comparing tumor cells from 30 ccRCC samples versus proximal tubule (PT) cells from four adjacent kidney tissue samples . Only samples with significantly differentially expressed transcripts are shown (adjusted p < 0.05, average log 2 fold change ≠ 0). e Isolation of renal tumor cells and corresponding tubule cells from non-diseased tissue of tumor nephrectomy specimens. Created in BioRender. Naas, S. (2025) https://BioRender.com/c87s173 . f Immunoblot analyses for HIF-1α, HIF-2α, pVHL, and β-actin in lysates from primary tubule (PTC) and tumor (ccRCC) cells isolated from tissue specimens of patient #1. Representative blot from 19 independent experiments with similar results. g Expression qPCR analysis for HIF-2α mRNA in lysates from primary tubule cells (PTC) and primary tumor (ccRCC) isolated from 34 different individuals. Graph shows median with interquartile range and p -values from a two-tailed unpaired t-test.

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: Expressing, RNA Sequencing, RNAscope, Isolation, Western Blot, Two Tailed Test

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Sequencing tracks from ATAC- and H3K27ac ChIP-seq experiments performed in cells from patient #1 at the EPAS1 locus. Activity-by-contact (ABC) analysis was used to predict enhancer-promoter interactions. Additionally, tracks from published data from Capture-C experiments in 786-0 cells , gained enhancer activity in ccRCC (ccRCC-enhancer) , ccRCC cancer-cell specific differentially accessible regions (ccRCC-specific DACR) as determined by snATAC-seq , KIRC hypomethylated CpGs (Beta-value cutoff 0.25, adjusted p -value cutoff 0.01) and KIRC-specific ATAC-seq elements are shown . b Differentially active enhancer regions on chromosome 2 in ccRCC tumors from Yao et al . Average log 2 fold chance (H3K27ac signal, ten tumors vs corresponding normal tissue) and -log 10 adjusted p -value are shown. Significantly regulated elements (adjusted p < 0.05, light blue) that overlap KIRC-specific ATAC sites are depicted in dark blue. Sites highlighted in red overlap KIRC-specific sites, show a positive log 2 fold change and are localized within 5 Mb of the EPAS1 gene. Enhancer enh-1031503 covers elements KIRC_10767-KIRC_10770. For comparison, the H3K27ac signal at the EPAS1 promoter is marked, but not significantly regulated. c ATAC-seq tracks for the different TCGA tumor entities at the ccRCC-enhancer site with gained activity in ccRCC . KIRC specific ATAC-seq sites 10767-70 are indicated above the tracks. d Spearman’s rank correlation analysis of HIF-2α mRNA expression (TPM: transcripts per million) and accessibility at KIRC_10770 in the KIRC data set. Values are from samples for which both analyses were available ( n = 16 different tumors). Gray region depicts 95% confidence interval. Significance was assessed with a two-sided t-approximation test.

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: Sequencing, ChIP-sequencing, Activity Assay, Capture-C, Comparison, Expressing

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a RSEM-normalized RNA-seq values for HIF-2α in the TCGA KIRC cohort stratified for VHL copy number alterations (diploid n = 38, deletion n = 309). P -values were determined by an unpaired, two-tailed t-test. b RT-qPCR analyses for HIF-2α mRNA in RCC4 cells with or without functional pVHL. Graph shows mean + SD. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. n = 4 independent experiments. c Representative immunoblot ( n = 2) for HIF-1α, HIF-2α, hemagglutinin (HA), and β-actin in lysates from RCC4/i.VHL-HA cells exposed to 0.5 µg/ml doxycycline to induce pVHL for the indicated time. d RT-qPCR analyses for HIF-2α mRNA in lysates from RCC4/i.VHL-HA cells treated with 0.5 µg/ml doxycycline for the indicated time. Expression values are mean + SD from three independent experiments. Significance was tested by a two-tailed one sample t-test with a hypothetical value of 1. e Expression qPCR analysis for HIF-2α mRNA in lysates from RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Mean + SD from 7 independent experiments. Differences were assessed by a two-tailed one sample t-test with a hypothetical value of 1. f RT-qPCR analysis for HIF-2α mRNA in lysates from 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Graph shows mean + SD from 5 independent experiments. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. g Representative immunoblot ( n = 2) for HIF-2α, HIF-1α, HIF-1β, and β-actin from lysates of RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. h Representative immunoblot ( n = 2) for HIF-2α, HIF-1β, and β-actin from lysates of 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. i ATAC-seq tracks at the ccRCC-activated enhancer in RCC4/i.VHL-HA cells as well as single clones of HIF-1β knock-out or nt control RCC4 or 786-0 cells, respectively. RCC4/i.VHL-HA were exposed either to 0.5 µg/ml doxycycline (Dox +) or to DMSO control (Dox -) for 18 h. The ATAC element KIRC_10770 is highlighted in orange. j H3K27ac CUT&Tag tracks from the same cells at the same genomic region as in i ).

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: RNA Sequencing, Two Tailed Test, Quantitative RT-PCR, Functional Assay, Western Blot, Expressing, Transfection, Control, CRISPR, Clone Assay, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analyses for HIF-2α mRNA in lysates from 105 isolates of primary tubule cells (PTC) exposed to 1 mM DMOG or control conditions for 16 h. Values are mean +/− SD from n = 105 independent experiments. Unpaired, two-tailed t-test. b Expression qPCR for HIF-2α mRNA in lysates from PTC depleted for HIF-1α or HIF-1β using siRNA and stimulated with or without 1 mM DMOG for 16 h. Non-targeting (nt) control siRNA was used as control. Values are mean + SD. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. Data is from nine independent experiments using PTC from nine different individuals. c HIF ChIP-seq tracks from lysates of primary tubule cells (PTC, green) treated with 1 mM DMOG for 4 h and ccRCC cells (blue) at the PRKCE-EPAS1 locus. ChIP-seq track for the activity marker H3K27ac in isolated ccRCC cells from patient #1 and hypomethylated CpGs in TCGA KIRC are also shown. KIRC-specific polymorphisms identified by the Cis-eQTL PancanQTL analysis as an eQTL for EPAS1 expression are indicated . Germline variants associated with renal cancer development within the EPAS1 -coding region are shown (RCC risk SNP) , . d Correlation of rs12617313 genotype and HIF-2α mRNA expression in the KIRC TCGA normal tissue and tumor data. Number of samples for normal tissue: Genotype TT n = 19, AT n = 25, AA n = 16. Number of samples for tumor tissue (KIRC): Genotype TT n = 94, AT n = 188, AA = 121. Data shown are median and interquartile range. χ 2 -test; p -value as indicated for higher expression in AA individuals compared with TT individuals. e Genotype-expression correlation for rs12617313 and HIF-2α mRNA in PTC exposed to 1 mM DMOG for 16 h or left untreated. Number of samples for each genotype: TT n = 26, AT n = 58, AA n = 21. Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test.

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: Expressing, Control, Two Tailed Test, ChIP-sequencing, Activity Assay, Marker, Isolation

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a ChIP-seq tracks for HIF-1β, PAX8 , H3K27ac and HNF-1β CUT&Tag-seq track from 786-0 cells at EPAS1 -enhancer E2. Binding sites for HNF-1β (E2_HNF-1β) and PAX8 (E2_PAX8) within KIRC_10767 are highlighted in blue. HIF-binding site is marked in orange. b Expression qPCR analyses for HIF-2α mRNA in lysates from 786-0 cells depleted for the indicated transcription factor (HNF-1β or PAX8). Values are mean + SD from 5 (HNF-1β) or 4 (PAX8) independent experiments. Statistical significance was assessed by a two-tailed one sample t-test with a hypothetical value of 1. c Immunoblot analyses for HIF-2α, HNF-1β, and β-actin in lysates from 786-0 cells depleted for HNF-1β using CRISPR/Cas9. Representative blot from two independent experiments with similar results. d Immunoblot analyses for HIF-2α, PAX8, and β-actin in lysates from 786-0 cells depleted for PAX8 using CRISPR/Cas9. Representative blot from two independent experiments with similar results. e ATAC-seq and CUT&Tag-seq tracks of the chromatin activity marker H3K27ac from single clones of HNF-1β knock-out, PAX8 knock-out or control (nt) clones of 786-0 cells at EPAS1 -enhancer E2. The ATAC KIRC element 10767 harboring binding sites for HNF-1β and PAX8 is highlighted in blue, the HIF-1β binding site at KIRC_10770 is marked in orange. f Schematic depiction of transcription factor binding sites for HNF-1β, PAX8 and HIF-1β at EPAS1- enhancer E2. Positions of sgRNAs used for knock-out of the respective binding sites are indicated in orange. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . g Expression qPCR analysis for HIF-2α mRNA in pools of 786-0 cells transfected with sgRNA targeting the HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) binding site at the EPAS1- enhancer E2. Cells treated with non-targeting sgRNA served as controls. Values are mean + SD. p -values were determined by a two tailed one sample t-test with a hypothetical value of 1. n = 5 (E2_HNF-1β) or n = 6 (E2_PAX8) independent experiments. h Immunoblot analyses for HIF-2α and β-actin in 786-0 cells with intact (nt) or mutated binding sites for HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) at the EPAS1 -enhancer E2. Representative blot from two independent experiments with similar results.

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: ChIP-sequencing, Binding Assay, Expressing, Two Tailed Test, Western Blot, CRISPR, Activity Assay, Marker, Clone Assay, Knock-Out, Control, Transfection

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Schematic of the two HIF-binding EPAS1 -enhancers E1 and E2 at the PRKCE-EPAS1 locus. The location of HIF-binding motifs and positions of sgRNAs within the KIRC elements are indicated. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . b Expression qPCR for HIF-2α mRNA in lysates from primary ccRCC cells isolated from 4 different tumor nephrectomies transfected with a pool of sgRNAs directed against the HIF-binding-sites at EPAS1 -enhancer 1 (E1) and EPAS1 -enhancer 2 (E2_HIF) or a control sgRNA (nt). Values are mean + SD from 4 independent experiments. Significance was determined by a two tailed one sample t-test with a hypothetical value of 1. Expression qPCR for HIF-2α mRNA in lysates from 786-0 ( c ) or RCC4 ( d ) cells transfected with sgRNAs targeting EPAS1 -enhancer 1 (E1), the HIF-binding site of EPAS1 -enhancer 2 (E2_HIF) or both enhancers (E1 + E2_HIF). nt = non-targeting control sgRNA. Values are mean + SD from independent experiments (786-0: n = 7 for nt; n = 6 for E1 and E2_HIF; n = 5 for E1 + E2_HIF; RCC4: n = 4 for nt and E1 + E2 HIF; n = 3 for E1 and E2_HIF). Significance was tested by a two tailed one sample t-test with a hypothetical value of 1. Immunoblot analyses for HIF-2α and β-actin protein in lysates from 786-0 ( e ) or RCC4 ( f ) cells transfected with sgRNAs targeting the enhancers as indicated. Representative blot from three (786-0) or two (RCC4) independent experiments with similar results. Gene set enrichment analysis for differentially expressed genes comparing RNA-seq data generated in 786-0 ( g ) or RCC4 ( h ) cells transfected with sgRNA targeting E2_HIF or non-targeting control guides (nt). One RNA sample of each condition was sequenced in technical duplicates. i Comparison of log 2 (fold change) expression values of genes significantly regulated upon E2_HIF knock-out in 786-0 or RCC4 cells. HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. One RNA sample of each condition was sequenced in technical duplicates.

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: Binding Assay, Expressing, Isolation, Transfection, Control, Two Tailed Test, Western Blot, RNA Sequencing, Generated, Comparison, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Representative immunoblot ( n = 3) for HIF-2α and β-actin protein in lysates from single clones of EPAS1 -enhancer 2 defective (E2_HIF) or control (non-targeting, nt) 786-0 cells. b Xenograft tumor assay in NOD/SCID-gamma mice using EPAS1 -enhancer 2 defective (E2_HIF ko) or intact (nt) clones of 786-0 cells. Volume values are mean ± SD from 6 tumors per cell clone. Two-way ANOVA followed by Bonferroni’s post hoc test comparing tumor volume between mean nt and E2_HIF ko at the indicated time points. Significant differences (** p < 0.01) were detected for comparisons between mean values of E2_HIF ko (2.1 or 2.2) with nt (0.1 or 0.2) xenografts for weeks 8, 9 and 10. c Weight of the explanted xenograft tumors. Data shown are median and interquartile range from 5 (E2_HIF 2.1) or 6 (nt 0.1, nt 0.2, E2_HIF2.2) tumors. One-way ANOVA followed by Bonferroni’s post hoc test. d Volcano plot from RNA-seq experiments in E2_HIF ko versus nt clones of 786-0 cells. HIF-2α mRNA as well as HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. Data is from the two clones of cells per condition from a) and b). e GSEA for HIF-binding sites in 786-0 cells and RNA-seq data ( n = 2 clones) from d). DEG: differentially expressed genes, ES: enrichment score. p -value was estimated using adaptive multilevel Monte Carlo scheme and adjusted for multiple testing with the Benjamini–Hochberg method. f CUT&Tag-seq (C&T) for HIF-1β and H3K27ac as well as ATAC-seq at EPAS1 -enhancer 2 and the control locus EGLN3 from E2_HIF ko versus nt clones of 786-0 cells. g CUT&Tag-seq signals for HIF-1β or H3K27ac integrated over 543 ChIP-seq pre-defined HIF1-β binding sites in E2_HIF ko versus nt clones of 786-0 cells. Non-HIF binding enhancers served as control. Signals were centered on the H3K27ac peak within the enhancers. h Comparison of log 2 (fold change) expression values of genes significantly regulated in E2_HIF ko 786-0 cells ( n = 2 clones) or through HIF-2 inhibition by PT2385 in 786-0 cells . HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. i The transcriptional circuitry of HIF-2α expression at the EPAS1 gene locus. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 .

Article Snippet: For immunoprecipitations, 70 μg of chromatin and 3–6 μl of antibodies directed against HIF-1α (Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA) or HIF-1β (NB100-110, Novus Biologicals, Littleton, CO, USA), H3K27ac (ab4729, Abcam, Cambridge, UK) were used.

Techniques: Western Blot, Clone Assay, Control, RNA Sequencing, Binding Assay, ChIP-sequencing, Comparison, Expressing, Inhibition

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analysis for HIF-2α mRNA in tissue lysates from renal tumors or corresponding normal kidney tissue from the Erlangen RCC cohort (ccRCC: clear cell renal carcinoma [ n = 114], pRCC: papillary renal cell carcinoma [ n = 16], chRCC: chromophobe renal cell carcinoma [ n = 11]). Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. b RNA-seq expression values for HIF-2α in different renal tumors and corresponding normal kidney tissue from the TCGA KIRC ( n = 72), KIRP ( n = 31) and KICH ( n = 23) data sets. Median and interquartile range. P -values were determined by two-way ANOVA followed by Bonferroni’s post hoc test. c RNAscope experiment for HIF-2α mRNA in ccRCC tissue. Arrows indicate HIF-2α mRNA transcripts in tumor cells. V = vessel. Scale bars, 100 µm or 75 µm as indicated. Representative image from independent samples of seven different patients with similar results. d Log 2 fold change of HIF-related genes in snRNA-seq data comparing tumor cells from 30 ccRCC samples versus proximal tubule (PT) cells from four adjacent kidney tissue samples . Only samples with significantly differentially expressed transcripts are shown (adjusted p < 0.05, average log 2 fold change ≠ 0). e Isolation of renal tumor cells and corresponding tubule cells from non-diseased tissue of tumor nephrectomy specimens. Created in BioRender. Naas, S. (2025) https://BioRender.com/c87s173 . f Immunoblot analyses for HIF-1α, HIF-2α, pVHL, and β-actin in lysates from primary tubule (PTC) and tumor (ccRCC) cells isolated from tissue specimens of patient #1. Representative blot from 19 independent experiments with similar results. g Expression qPCR analysis for HIF-2α mRNA in lysates from primary tubule cells (PTC) and primary tumor (ccRCC) isolated from 34 different individuals. Graph shows median with interquartile range and p -values from a two-tailed unpaired t-test.

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: Expressing, RNA Sequencing, RNAscope, Isolation, Western Blot, Two Tailed Test

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Sequencing tracks from ATAC- and H3K27ac ChIP-seq experiments performed in cells from patient #1 at the EPAS1 locus. Activity-by-contact (ABC) analysis was used to predict enhancer-promoter interactions. Additionally, tracks from published data from Capture-C experiments in 786-0 cells , gained enhancer activity in ccRCC (ccRCC-enhancer) , ccRCC cancer-cell specific differentially accessible regions (ccRCC-specific DACR) as determined by snATAC-seq , KIRC hypomethylated CpGs (Beta-value cutoff 0.25, adjusted p -value cutoff 0.01) and KIRC-specific ATAC-seq elements are shown . b Differentially active enhancer regions on chromosome 2 in ccRCC tumors from Yao et al . Average log 2 fold chance (H3K27ac signal, ten tumors vs corresponding normal tissue) and -log 10 adjusted p -value are shown. Significantly regulated elements (adjusted p < 0.05, light blue) that overlap KIRC-specific ATAC sites are depicted in dark blue. Sites highlighted in red overlap KIRC-specific sites, show a positive log 2 fold change and are localized within 5 Mb of the EPAS1 gene. Enhancer enh-1031503 covers elements KIRC_10767-KIRC_10770. For comparison, the H3K27ac signal at the EPAS1 promoter is marked, but not significantly regulated. c ATAC-seq tracks for the different TCGA tumor entities at the ccRCC-enhancer site with gained activity in ccRCC . KIRC specific ATAC-seq sites 10767-70 are indicated above the tracks. d Spearman’s rank correlation analysis of HIF-2α mRNA expression (TPM: transcripts per million) and accessibility at KIRC_10770 in the KIRC data set. Values are from samples for which both analyses were available ( n = 16 different tumors). Gray region depicts 95% confidence interval. Significance was assessed with a two-sided t-approximation test.

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: Sequencing, ChIP-sequencing, Activity Assay, Capture-C, Comparison, Expressing

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a RSEM-normalized RNA-seq values for HIF-2α in the TCGA KIRC cohort stratified for VHL copy number alterations (diploid n = 38, deletion n = 309). P -values were determined by an unpaired, two-tailed t-test. b RT-qPCR analyses for HIF-2α mRNA in RCC4 cells with or without functional pVHL. Graph shows mean + SD. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. n = 4 independent experiments. c Representative immunoblot ( n = 2) for HIF-1α, HIF-2α, hemagglutinin (HA), and β-actin in lysates from RCC4/i.VHL-HA cells exposed to 0.5 µg/ml doxycycline to induce pVHL for the indicated time. d RT-qPCR analyses for HIF-2α mRNA in lysates from RCC4/i.VHL-HA cells treated with 0.5 µg/ml doxycycline for the indicated time. Expression values are mean + SD from three independent experiments. Significance was tested by a two-tailed one sample t-test with a hypothetical value of 1. e Expression qPCR analysis for HIF-2α mRNA in lysates from RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Mean + SD from 7 independent experiments. Differences were assessed by a two-tailed one sample t-test with a hypothetical value of 1. f RT-qPCR analysis for HIF-2α mRNA in lysates from 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. Graph shows mean + SD from 5 independent experiments. P -values were determined by a two-tailed one sample t-test with a hypothetical value of 1. g Representative immunoblot ( n = 2) for HIF-2α, HIF-1α, HIF-1β, and β-actin from lysates of RCC4 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. h Representative immunoblot ( n = 2) for HIF-2α, HIF-1β, and β-actin from lysates of 786-0 cells transfected with sgRNA targeting HIF-1β or non-targeting (nt) control using CRISPR/Cas9. i ATAC-seq tracks at the ccRCC-activated enhancer in RCC4/i.VHL-HA cells as well as single clones of HIF-1β knock-out or nt control RCC4 or 786-0 cells, respectively. RCC4/i.VHL-HA were exposed either to 0.5 µg/ml doxycycline (Dox +) or to DMSO control (Dox -) for 18 h. The ATAC element KIRC_10770 is highlighted in orange. j H3K27ac CUT&Tag tracks from the same cells at the same genomic region as in i ).

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: RNA Sequencing, Two Tailed Test, Quantitative RT-PCR, Functional Assay, Western Blot, Expressing, Transfection, Control, CRISPR, Clone Assay, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Expression qPCR analyses for HIF-2α mRNA in lysates from 105 isolates of primary tubule cells (PTC) exposed to 1 mM DMOG or control conditions for 16 h. Values are mean +/− SD from n = 105 independent experiments. Unpaired, two-tailed t-test. b Expression qPCR for HIF-2α mRNA in lysates from PTC depleted for HIF-1α or HIF-1β using siRNA and stimulated with or without 1 mM DMOG for 16 h. Non-targeting (nt) control siRNA was used as control. Values are mean + SD. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test. Data is from nine independent experiments using PTC from nine different individuals. c HIF ChIP-seq tracks from lysates of primary tubule cells (PTC, green) treated with 1 mM DMOG for 4 h and ccRCC cells (blue) at the PRKCE-EPAS1 locus. ChIP-seq track for the activity marker H3K27ac in isolated ccRCC cells from patient #1 and hypomethylated CpGs in TCGA KIRC are also shown. KIRC-specific polymorphisms identified by the Cis-eQTL PancanQTL analysis as an eQTL for EPAS1 expression are indicated . Germline variants associated with renal cancer development within the EPAS1 -coding region are shown (RCC risk SNP) , . d Correlation of rs12617313 genotype and HIF-2α mRNA expression in the KIRC TCGA normal tissue and tumor data. Number of samples for normal tissue: Genotype TT n = 19, AT n = 25, AA n = 16. Number of samples for tumor tissue (KIRC): Genotype TT n = 94, AT n = 188, AA = 121. Data shown are median and interquartile range. χ 2 -test; p -value as indicated for higher expression in AA individuals compared with TT individuals. e Genotype-expression correlation for rs12617313 and HIF-2α mRNA in PTC exposed to 1 mM DMOG for 16 h or left untreated. Number of samples for each genotype: TT n = 26, AT n = 58, AA n = 21. Data shown are median and interquartile range. Significance was tested by two-way ANOVA followed by Bonferroni’s post hoc test.

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: Expressing, Control, Two Tailed Test, ChIP-sequencing, Activity Assay, Marker, Isolation

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a ChIP-seq tracks for HIF-1β, PAX8 , H3K27ac and HNF-1β CUT&Tag-seq track from 786-0 cells at EPAS1 -enhancer E2. Binding sites for HNF-1β (E2_HNF-1β) and PAX8 (E2_PAX8) within KIRC_10767 are highlighted in blue. HIF-binding site is marked in orange. b Expression qPCR analyses for HIF-2α mRNA in lysates from 786-0 cells depleted for the indicated transcription factor (HNF-1β or PAX8). Values are mean + SD from 5 (HNF-1β) or 4 (PAX8) independent experiments. Statistical significance was assessed by a two-tailed one sample t-test with a hypothetical value of 1. c Immunoblot analyses for HIF-2α, HNF-1β, and β-actin in lysates from 786-0 cells depleted for HNF-1β using CRISPR/Cas9. Representative blot from two independent experiments with similar results. d Immunoblot analyses for HIF-2α, PAX8, and β-actin in lysates from 786-0 cells depleted for PAX8 using CRISPR/Cas9. Representative blot from two independent experiments with similar results. e ATAC-seq and CUT&Tag-seq tracks of the chromatin activity marker H3K27ac from single clones of HNF-1β knock-out, PAX8 knock-out or control (nt) clones of 786-0 cells at EPAS1 -enhancer E2. The ATAC KIRC element 10767 harboring binding sites for HNF-1β and PAX8 is highlighted in blue, the HIF-1β binding site at KIRC_10770 is marked in orange. f Schematic depiction of transcription factor binding sites for HNF-1β, PAX8 and HIF-1β at EPAS1- enhancer E2. Positions of sgRNAs used for knock-out of the respective binding sites are indicated in orange. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . g Expression qPCR analysis for HIF-2α mRNA in pools of 786-0 cells transfected with sgRNA targeting the HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) binding site at the EPAS1- enhancer E2. Cells treated with non-targeting sgRNA served as controls. Values are mean + SD. p -values were determined by a two tailed one sample t-test with a hypothetical value of 1. n = 5 (E2_HNF-1β) or n = 6 (E2_PAX8) independent experiments. h Immunoblot analyses for HIF-2α and β-actin in 786-0 cells with intact (nt) or mutated binding sites for HNF-1β (E2_HNF-1β) or PAX8 (E2_PAX8) at the EPAS1 -enhancer E2. Representative blot from two independent experiments with similar results.

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: ChIP-sequencing, Binding Assay, Expressing, Two Tailed Test, Western Blot, CRISPR, Activity Assay, Marker, Clone Assay, Knock-Out, Control, Transfection

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Schematic of the two HIF-binding EPAS1 -enhancers E1 and E2 at the PRKCE-EPAS1 locus. The location of HIF-binding motifs and positions of sgRNAs within the KIRC elements are indicated. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 . b Expression qPCR for HIF-2α mRNA in lysates from primary ccRCC cells isolated from 4 different tumor nephrectomies transfected with a pool of sgRNAs directed against the HIF-binding-sites at EPAS1 -enhancer 1 (E1) and EPAS1 -enhancer 2 (E2_HIF) or a control sgRNA (nt). Values are mean + SD from 4 independent experiments. Significance was determined by a two tailed one sample t-test with a hypothetical value of 1. Expression qPCR for HIF-2α mRNA in lysates from 786-0 ( c ) or RCC4 ( d ) cells transfected with sgRNAs targeting EPAS1 -enhancer 1 (E1), the HIF-binding site of EPAS1 -enhancer 2 (E2_HIF) or both enhancers (E1 + E2_HIF). nt = non-targeting control sgRNA. Values are mean + SD from independent experiments (786-0: n = 7 for nt; n = 6 for E1 and E2_HIF; n = 5 for E1 + E2_HIF; RCC4: n = 4 for nt and E1 + E2 HIF; n = 3 for E1 and E2_HIF). Significance was tested by a two tailed one sample t-test with a hypothetical value of 1. Immunoblot analyses for HIF-2α and β-actin protein in lysates from 786-0 ( e ) or RCC4 ( f ) cells transfected with sgRNAs targeting the enhancers as indicated. Representative blot from three (786-0) or two (RCC4) independent experiments with similar results. Gene set enrichment analysis for differentially expressed genes comparing RNA-seq data generated in 786-0 ( g ) or RCC4 ( h ) cells transfected with sgRNA targeting E2_HIF or non-targeting control guides (nt). One RNA sample of each condition was sequenced in technical duplicates. i Comparison of log 2 (fold change) expression values of genes significantly regulated upon E2_HIF knock-out in 786-0 or RCC4 cells. HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. One RNA sample of each condition was sequenced in technical duplicates.

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: Binding Assay, Expressing, Isolation, Transfection, Control, Two Tailed Test, Western Blot, RNA Sequencing, Generated, Comparison, Knock-Out

Journal: Nature Communications

Article Title: HIF sustain a transcriptional regulatory circuit of EPAS1 expression in renal clear cell carcinoma

doi: 10.1038/s41467-026-68576-0

Figure Lengend Snippet: a Representative immunoblot ( n = 3) for HIF-2α and β-actin protein in lysates from single clones of EPAS1 -enhancer 2 defective (E2_HIF) or control (non-targeting, nt) 786-0 cells. b Xenograft tumor assay in NOD/SCID-gamma mice using EPAS1 -enhancer 2 defective (E2_HIF ko) or intact (nt) clones of 786-0 cells. Volume values are mean ± SD from 6 tumors per cell clone. Two-way ANOVA followed by Bonferroni’s post hoc test comparing tumor volume between mean nt and E2_HIF ko at the indicated time points. Significant differences (** p < 0.01) were detected for comparisons between mean values of E2_HIF ko (2.1 or 2.2) with nt (0.1 or 0.2) xenografts for weeks 8, 9 and 10. c Weight of the explanted xenograft tumors. Data shown are median and interquartile range from 5 (E2_HIF 2.1) or 6 (nt 0.1, nt 0.2, E2_HIF2.2) tumors. One-way ANOVA followed by Bonferroni’s post hoc test. d Volcano plot from RNA-seq experiments in E2_HIF ko versus nt clones of 786-0 cells. HIF-2α mRNA as well as HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. Data is from the two clones of cells per condition from a) and b). e GSEA for HIF-binding sites in 786-0 cells and RNA-seq data ( n = 2 clones) from d). DEG: differentially expressed genes, ES: enrichment score. p -value was estimated using adaptive multilevel Monte Carlo scheme and adjusted for multiple testing with the Benjamini–Hochberg method. f CUT&Tag-seq (C&T) for HIF-1β and H3K27ac as well as ATAC-seq at EPAS1 -enhancer 2 and the control locus EGLN3 from E2_HIF ko versus nt clones of 786-0 cells. g CUT&Tag-seq signals for HIF-1β or H3K27ac integrated over 543 ChIP-seq pre-defined HIF1-β binding sites in E2_HIF ko versus nt clones of 786-0 cells. Non-HIF binding enhancers served as control. Signals were centered on the H3K27ac peak within the enhancers. h Comparison of log 2 (fold change) expression values of genes significantly regulated in E2_HIF ko 786-0 cells ( n = 2 clones) or through HIF-2 inhibition by PT2385 in 786-0 cells . HIF-target transcripts NDRG1, VEGFA, and CCND1 are indicated. i The transcriptional circuitry of HIF-2α expression at the EPAS1 gene locus. Created in BioRender. Naas, S. (2025) https://BioRender.com/w24j560 .

Article Snippet: Cells were centrifuged for 5 min at 600 g, resuspended in 100 μl antibody buffer with 1:50 diluted primary antibody (monoclonal rabbit anti-HIF-1β antibody [5537S, Cell Signaling Technology, Danvers, MA, USA] or polyclonal rabbit anti-HIF-1β antibody [NB100-110, Novus Biologicals, Biotechne, Wiesbaden, Germany] or monoclonal rabbit anti-H3K27ac antibody [ab177178, Abcam, Cambridge, UK] or polyclonal rabbit anti-HIF-1α antibody [Cay10006421, Cayman Chemicals, Ann Arbor, MI, USA] or polyclonal rabbit anti-HNF-1β antibody [HPA002083, Atlas Antibodies, Sigma Aldrich, St. Louis, MO, USA]) and incubated overnight.

Techniques: Western Blot, Clone Assay, Control, RNA Sequencing, Binding Assay, ChIP-sequencing, Comparison, Expressing, Inhibition