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Translation of circRNAs

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Official URL:https://doi.org/10.1016/j.molcel.2017.02.021
PubMed:View item in PubMed
Creators Name:Pamudurti, NR. and Bartok, O. and Jens, M. and Ashwal-Fluss, R. and Stottmeister, C. and Ruhe, L. and Hanan, M. and Wyler, E. and Perez-Hernandez, D. and Ramberger, E. and Shenzis, S. and Samson, M. and Dittmar, G. and Landthaler, M. and Chekulaeva, M. and Rajewsky, N. and Kadener, S.
Journal Title:Molecular Cell
Journal Abbreviation:Mol Cell
Volume:66
Number:1
Page Range:9-21.e7
Date:6 April 2017
Keywords:circRNA, Translation, Muscleblind, Cap-Independent
Abstract:Circular RNAs (circRNAs) are abundant and evolutionarily conserved RNAs of largely unknown function. Here, we show that a subset of circRNAs is translated in vivo. By performing ribosome footprinting from fly heads, we demonstrate that a group of circRNAs is associated with translating ribosomes. Many of these ribo-circRNAs use the start codon of the hosting mRNA, are bound by membrane-associated ribosomes, and have evolutionarily conserved termination codons. In addition, we found that a circRNA generated from the muscleblind locus encodes a protein, which we detected in fly head extracts by mass spectrometry. Next, by performing in vivo and in vitro translation assays, we show that UTRs of ribo-circRNAs (cUTRs) allow cap-independent translation. Moreover, we found that starvation and FOXO likely regulate the translation of a circMbl isoform. Altogether, our study provides strong evidence for translation of circRNAs, revealing the existence of an unexplored layer of gene activity.
ISSN:1097-2765
Publisher:Cell Press (U.S.A.)
Item Type:Article

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