Correlation of circular RNA abundance with proliferation--exemplified with colorectal and ovarian cancer, idiopathic lung fibrosis, and normal human tissues.
Anna Bachmayr-Heyda,Agnes T. Reiner,Katharina Auer,Nyamdelger Sukhbaatar,Stefanie Aust,Thomas Bachleitner-Hofmann,Ildiko Mesteri,Thomas W. Grunt,Robert Zeillinger,Dietmar Pils +9 more
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TLDR
The first to report a global reduction of circular RNA abundance in colorectal cancer cell lines and cancer compared to normal tissues is reported and a negative correlation of global circular RNAs abundance and proliferation is discovered.Abstract:
Circular RNAs are a recently (re-)discovered abundant RNA species with presumed function as miRNA sponges, thus part of the competing endogenous RNA network. We analysed the expression of circular and linear RNAs and proliferation in matched normal colon mucosa and tumour tissues. We predicted >1,800 circular RNAs and proved the existence of five randomly chosen examples using RT-qPCR. Interestingly, the ratio of circular to linear RNA isoforms was always lower in tumour compared to normal colon samples and even lower in colorectal cancer cell lines. Furthermore, this ratio correlated negatively with the proliferation index. The correlation of global circular RNA abundance (the circRNA index) and proliferation was validated in a non-cancerous proliferative disease, idiopathic pulmonary fibrosis, ovarian cancer cells compared to cultured normal ovarian epithelial cells, and 13 normal human tissues. We are the first to report a global reduction of circular RNA abundance in colorectal cancer cell lines and cancer compared to normal tissues and discovered a negative correlation of global circular RNA abundance and proliferation. This negative correlation seems to be a general principle in human tissues as validated with three different settings. Finally, we present a simple model how circular RNAs could accumulate in non-proliferating cells.read more
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The biogenesis, biology and characterization of circular RNAs.
Lasse Sommer Kristensen,Maria S. Andersen,Lotte V. W. Stagsted,Karoline K. Ebbesen,Thomas B. Hansen,Jørgen Kjems +5 more
TL;DR: Advances in high-throughput RNA sequencing and circRNA-specific computational tools have driven the development of state-of-the-art approaches for their identification, and novel approaches to functional characterization are emerging.
Journal ArticleDOI
Circular RNA: A new star of noncoding RNAs
Shibin Qu,Xisheng Yang,Xiaolei Li,Jianlin Wang,Yuan Gao,Runze Shang,Wei Sun,Kefeng Dou,Haimin Li +8 more
TL;DR: Similar to miRNAs and long noncoding RNAs (lncRNAs), circRNAs are becoming a new research hotspot in the field of RNA and could be widely involved in the processes of life.
Journal ArticleDOI
The Biogenesis, Functions, and Challenges of Circular RNAs.
TL;DR: The recent progress on circRNA biogenesis and function is surveyed and technical obstacles in circRNA studies are discussed.
Journal ArticleDOI
The biogenesis and emerging roles of circular RNAs
TL;DR: The data indicate that circRNAs shape gene expression by titrating microRNAs, regulating transcription and interfering with splicing, thus effectively expanding the diversity and complexity of eukaryotic transcriptomes.
Journal ArticleDOI
Circular RNAs in cancer: opportunities and challenges in the field.
TL;DR: The current knowledge on circRNAs is reviewed in relation to their implications in tumorigenesis as well as their potential as diagnostic and prognostic biomarkers and as possible therapeutic targets in future personalized medicine.
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Journal ArticleDOI
Circular RNAs are a large class of animal RNAs with regulatory potency
Sebastian Memczak,Marvin Jens,Antigoni Elefsinioti,Francesca Torti,Janna Krueger,Agnieszka Rybak,Luisa Maier,Sebastian D. Mackowiak,Lea H. Gregersen,Mathias Munschauer,Alexander Loewer,Ulrike Ziebold,Markus Landthaler,Christine Kocks,Ferdinand le Noble,Nikolaus Rajewsky +15 more
TL;DR: It is found that a human circRNA, antisense to the cerebellar degeneration-related protein 1 transcript (CDR1as), is densely bound by microRNA (miRNA) effector complexes and harbours 63 conserved binding sites for the ancient miRNA miR-7.
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Natural RNA circles function as efficient microRNA sponges
Thomas B. Hansen,Trine I. Jensen,Bettina Hjelm Clausen,Jesper B. Bramsen,Bente Finsen,Christian Kroun Damgaard,Jørgen Kjems +6 more
TL;DR: This study serves as the first functional analysis of a naturally expressed circular RNA, ciRS-7, which contains more than 70 selectively conserved miRNA target sites, and is highly and widely associated with Argonaute proteins in a miR-7-dependent manner.