tRNA-like Transcripts from the NEAT1-MALAT1 Genomic Region Critically Influence Human Innate Immunity and Macrophage Functions

Cells. 2022 Dec 8;11(24):3970. doi: 10.3390/cells11243970.

Abstract

The evolutionary conserved NEAT1-MALAT1 gene cluster generates large noncoding transcripts remaining nuclear, while tRNA-like transcripts (mascRNA, menRNA) enzymatically generated from these precursors translocate to the cytosol. Whereas functions have been assigned to the nuclear transcripts, data on biological functions of the small cytosolic transcripts are sparse. We previously found NEAT1-/- and MALAT1-/- mice to display massive atherosclerosis and vascular inflammation. Here, employing selective targeted disruption of menRNA or mascRNA, we investigate the tRNA-like molecules as critical components of innate immunity. CRISPR-generated human ΔmascRNA and ΔmenRNA monocytes/macrophages display defective innate immune sensing, loss of cytokine control, imbalance of growth/angiogenic factor expression impacting upon angiogenesis, and altered cell-cell interaction systems. Antiviral response, foam cell formation/oxLDL uptake, and M1/M2 polarization are defective in ΔmascRNA/ΔmenRNA macrophages, defining first biological functions of menRNA and describing new functions of mascRNA. menRNA and mascRNA represent novel components of innate immunity arising from the noncoding genome. They appear as prototypes of a new class of noncoding RNAs distinct from others (miRNAs, siRNAs) by biosynthetic pathway and intracellular kinetics. Their NEAT1-MALAT1 region of origin appears as archetype of a functionally highly integrated RNA processing system.

Keywords: evolutionary genetics; immunogenetics; immunology; innate immunity; noncoding genome; tRNA biology.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Genomics
  • Humans
  • Immunity, Innate* / genetics
  • Immunity, Innate* / immunology
  • Macrophages* / immunology
  • RNA, Long Noncoding* / genetics
  • RNA, Long Noncoding* / immunology
  • RNA, Transfer* / genetics
  • RNA, Transfer* / immunology

Substances

  • RNA, Long Noncoding
  • RNA, Transfer
  • NEAT1 long non-coding RNA, human
  • MALAT1 long non-coding RNA, human

Grants and funding

W.P. and T.Z. received DZHK shared expertise grants B19-006_SE (FKZ 81 × 2,100,257 and FKZ 81 × 2,710,170 ‘Transcriptome analysis of circulating immune cells to improve the assessment of prognosis and the response to novel anti-inflammatory treatments after myocardial infarction’) and B18-004_SE (FKZ 81 × 2,100,253, ‘Functional role and therapeutic potential of the long noncoding RNA NEAT1-MALAT1 genomic region in cardiovascular inflammation control and atheropathogenesis’) from the German Center for Cardiovascular Research (DZHK). T.Z. is supported by the German Center of Cardiovascular Disease (FKZ 81Z0710102; Systems-medicine approaches in cardiovascular disease, partner site project). A.H. received a grant (FKZ 01ZX1906B ‘Systems-medicine of pneumonia-aggravated atherosclerosis’) from the German Federal Ministry of Education and Research (BMBF). A.H. is supported by the Berlin Institute of Health (BIH) Advanced Clinician Scientist program.