Macrophage development and activation involve coordinated intron retention in key inflammatory regulators. Issue 12 (25th May 2020)

• Record Type: Journal Article
• Authors: Green, Immanuel D; Pinello, Natalia; Song, Renhua; Lee, Quintin; Halstead, James M; Kwok, Chau-To; Wong, Alex C H; Nair, Shalima S; Clark, Susan J; Roediger, Ben; Schmitz, Ulf; Larance, Mark; Hayashi, Rippei; Rasko, John E J; Wong, Justin J-L
• Is Part Of: Nucleic acids research. Volume 48:Issue 12(2020)
• Page Start: 6513
• Page End: 6529
• Publication Date: 2020-05-25
• Subjects: Nucleic acids -- Periodicals; Molecular biology -- Periodicals; 572.805
• DOI: 10.1093/nar/gkaa435
• Languages: English
• ISSNs: 0305-1048

Abstract

Abstract: Monocytes and macrophages are essential components of the innate immune system. Herein, we report that intron retention (IR) plays an important role in the development and function of these cells. Using Illumina mRNA sequencing, Nanopore direct cDNA sequencing and proteomics analysis, we identify IR events that affect the expression of key genes/proteins involved in macrophage development and function. We demonstrate that decreased IR in nuclear-detained mRNA is coupled with increased expression of genes encoding regulators of macrophage transcription, phagocytosis and inflammatory signalling, including ID2, IRF7, ENG and LAT . We further show that this dynamic IR program persists during the polarisation of resting macrophages into activated macrophages. In the presence of proinflammatory stimuli, intron-retaining CXCL2 and NFKBIZ transcripts are rapidly spliced, enabling timely expression of these key inflammatory regulators by macrophages. Our study provides novel insights into the molecular factors controlling vital regulators of the innate immune response.