Analysis of the deep-sequencing data.

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Presentation transcript:

Analysis of the deep-sequencing data. Analysis of the deep-sequencing data. (A) Venn diagram of mRNAs containing at least one m6A modification (upper diagram) and m6A peaks detected in mRNAs (lower diagram) identified in HEK-TIA1 (HEK) cells under control growth and at 500 μM AS stress. (B) Venn diagram of mRNAs containing at least one m6A modification (upper diagram) and m6A peaks detected in mRNAs (lower diagram) identified in HEK-TIA1 (HEK) cells in this study compared with those in U2OS cells (Xiang et al, 2017). (C) Transmission electron microscopy image of isolated SGs (gray arrow) subjected to PAR-CLIP (upper images). Black arrow indicates magnetic beads (appear as light, non-transparent black dots) used to isolate SGs. FISH on isolated SGs using fluorescently labeled oligo-dT primers recognizing the polyA tails of mRNAs (red). The yellow/orange color denotes colocalization of polyA-mRNA and G3BP1-GFP (green) signal. Scale bar, 0.5 μM. (D) The two most abundant motifs among the SG mRNA clients revealed by MEME motif search. These motifs score for various RNA-binding proteins and not only for TIA1 (Munteanu et al, 2018 Preprint). (E). Comparison between total mRNA from control HEK-TIA1 cells or exposed to 200 μM AS determined by RNA-Seq. R2 = 0.992, Pearson correlation coefficient. (F) Identified SG clients span a large expression range. Total mRNAs, black; mRNAs in SGs, blue; and mRNAs generating RPFs at 200 μM AS, red. (G) Distribution of the predicted DRACH motifs (upper plot) or depicted as fractions (lower pie charts) in different transcript segments of the SG clients and translated genes. Transcript regions were binned for comparable lengths. CDS are the longest and exhibit the highest fraction of m6A motifs. Genes translated under moderate stress exposure (200 μM AS) contain more DRACH motifs in the 5′ UTRs compared with the 5′ UTRs of the SG mRNA clients, P = 1.4 × 10−3, Mann–Whitney test. (H) Correlation of the SG transcripts detected at 200 and 500 μM AS in the PAR-CLIP of two merged biological replicates. R2 = 0.883, Pearson correlation coefficient. Source data are available for this figure. Maximilian Anders et al. LSA 2018;1:e201800113 © 2018 Ignatova et al.