Dieldrin causes transcription of HERV-containing PEs atypical for activated T cells Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min.Figure 3Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Screen captures from IGV showing an example of a HERV becoming a site of divergent transcription upon exposure of the Jurkat cells to dieldrin. Top tracks show coverage from sequencing of poly(A)-enriched libraries for comparison. All coverage tracks are at the same scale and all the sequencing result files are of comparable size. Blue and red reads (rds) are in opposite orientation. CAGE peaks use the same color code. Reads mapping inside a series of 4686 HERVs located away (30Kb) from protein-coding genes were quantified both in the poly(A)-enriched and the ribo-depleted data. Read counts from each replicate were then summed and plotted. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Distribution of regions annotated "LTR" in RepeatMasker relative to sites of divergent transcription in Jurkat cells treated with either DMSO or dieldrin in DMSO. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Schematic showing that only a fraction of the APEs (sites of divergent transcription activated 2-fold or more by dieldrin) match promoters and enhancers annotated as active in T cells (APETs). The remaining APEs are designated APEDs (specific to the dieldrin treatment). Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Comparison of regions annotated "LTR" in RepeatMasker with the APEs, APETs, and APEDs. The graph provides the ratio between the Jaccard index of the indicated category over the average of Jaccard indexes calculated for 1000 series of randomly selected PEs. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Comparison of either APEs or APEDs as indicated with the regions annotated TssA, TssAFlnk, Enh, EnhG, TssBiv, or EnhBiv in the 15 core marks model of the Epigenomic Roadmap consortium as in Figure 1A. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Region upstream of IL2 as a screen capture from the genome browser of the Epigenomic Roadmap consortium. Promoters and enhancers are annotated in red and yellow respectively. Green indicates transcription. Insert is a detail from Appendix Figure S3A showing the site of divergent transcription induced by dieldrin. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Jurkat T cells were treated with either DMSO (vehicle) or 100μM dieldrin for the indicated times. Abundance of IL2 mRNA was assessed by RT-qPCR. Data shown are means +/- SEM from four independent experiments. Significance (p-value) was estimated using the two-sided student t test appropriate for small sample numbers. ***: p-value<0.001. Jurkat cells were exposed to either DMSO, or dieldrin in DMSO for 30 min. RNA-seq was then performed on cDNA libraries prepared after depletion of ribosomal RNAs. Screen captures from IGV showing increased divergent transcription inside a HERV sequence upon exposure of the Jurkat cells to dieldrin in the intergenic region between MUC21 and MUC22. Color code as in (A).