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Translation of CircRNAs

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. Ma...

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Detalles Bibliográficos
Autores principales: Pamudurti, Nagarjuna Reddy, Bartok, Osnat, Jens, Marvin, Ashwal-Fluss, Reut, Stottmeister, Christin, Ruhe, Larissa, Hanan, Mor, Wyler, Emanuel, Perez-Hernandez, Daniel, Ramberger, Evelyn, Shenzis, Shlomo, Samson, Moshe, Dittmar, Gunnar, Landthaler, Markus, Chekulaeva, Marina, Rajewsky, Nikolaus, Kadener, Sebastian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cell Press 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5387669/
https://www.ncbi.nlm.nih.gov/pubmed/28344080
http://dx.doi.org/10.1016/j.molcel.2017.02.021
Descripción
Sumario: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.