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Proc Natl Acad Sci U S A January 1, 2018; 115 (34): E7970-E7977.

Lariat intronic RNAs in the cytoplasm of vertebrate cells.

Most intronic RNAs are degraded within seconds or minutes after their excision from newly formed transcripts. However, stable intronic sequence RNAs (sisRNAs) have been described from oocytes of the frog Xenopus, from Drosophila embryos, and from human cell lines. In Xenopus oocytes, sisRNAs are abundant in both the nucleus and cytoplasm, they occur in the form of lariats, and they are stable for days. In this study we demonstrate that cytoplasmic sisRNAs are also found in human, mouse, chicken, and zebrafish cells. They exist as circular (lariat) molecules, mostly 100-500 nucleotides in length, and are derived from many housekeeping genes. They tend to have an unusual cytosine branchpoint (with the exception of those from the frog). Stable lariats are exported from the nucleus to the cytoplasm by the NXF1/NXT1 system, demonstrating that their presence in the cytoplasm is not due to passive diffusion. Lariats in the cytoplasm are not associated with transcripts of the genes from which they are derived. The biological significance of cytoplasmic sisRNAs remains obscure.

PubMed ID: 30082412
PMC ID: PMC6112733
Article link: Proc Natl Acad Sci U S A
Grant support: [+]

Species referenced: Xenopus
Genes referenced: actg1 anapc2 faf2 ift43 lipg nfx1 nxf1 pphln1 ran trappc9 uggt1 xrn1

Article Images: [+] show captions
References [+] :
Alhasan, Circular RNA enrichment in platelets is a signature of transcriptome degradation. 2016, Pubmed