The RNA exosome shapes the expression of key protein-coding genes. Issue 15 (25th July 2020)

• Record Type: Journal Article
• Authors: Wu, Mengjun; Karadoulama, Evdoxia; Lloret-Llinares, Marta; Rouviere, Jerome Olivier; Vaagensø, Christian Skov; Moravec, Martin; Li, Bingnan; Wang, Jingwen; Wu, Guifen; Gockert, Maria; Pelechano, Vicent; Jensen, Torben Heick; Sandelin, Albin
• Is Part Of: Nucleic acids research. Volume 48:Issue 15(2020)
• Page Start: 8509
• Page End: 8528
• Publication Date: 2020-07-25
• Subjects: Nucleic acids -- Periodicals; Molecular biology -- Periodicals; 572.805
• DOI: 10.1093/nar/gkaa594
• Languages: English
• ISSNs: 0305-1048

Abstract

Abstract: The ribonucleolytic exosome complex is central for nuclear RNA degradation, primarily targeting non-coding RNAs. Still, the nuclear exosome could have protein-coding (pc) gene-specific regulatory activities. By depleting an exosome core component, or components of exosome adaptor complexes, we identify ∼2900 transcription start sites (TSSs) from within pc genes that produce exosome-sensitive transcripts. At least 1000 of these overlap with annotated mRNA TSSs and a considerable portion of their transcripts share the annotated mRNA 3′ end. We identify two types of pc-genes, both employing a single, annotated TSS across cells, but the first type primarily produces full-length, exosome-sensitive transcripts, whereas the second primarily produces prematurely terminated transcripts. Genes within the former type often belong to immediate early response transcription factors, while genes within the latter are likely transcribed as a consequence of their proximity to upstream TSSs on the opposite strand. Conversely, when genes have multiple active TSSs, alternative TSSs that produce exosome-sensitive transcripts typically do not contribute substantially to overall gene expression, and most such transcripts are prematurely terminated. Our results display a complex landscape of sense transcription within pc-genes and imply a direct role for nuclear RNA turnover in the regulation of a subset of pc-genes.