Cited by 137Circular RNAs in diseasesRNA Research and SplicingCancer-related molecular mechanisms research

Insights into the biogenesis and potential functions of exonic circular RNA

Open access
Ragan, Chikako, Goodall, Gregory J., Shirokikh, Nikolay E., Preiss, Thomas·2019·Scientific Reports

Abstract

Circular RNAs (circRNAs) exhibit unique properties due to their covalently closed nature. Models of circRNAs synthesis and function are emerging but much remains undefined about this surprisingly prevalent class of RNA. Here, we identified exonic circRNAs from human and mouse RNA-sequencing datasets, documenting multiple new examples. Addressing function, we found that many circRNAs co-sediment with ribosomes, indicative of their translation potential. By contrast, circRNAs with potential to act as microRNA sponges were scarce, with some support for a collective sponge function by groups of circRNAs. Addressing circRNA biogenesis, we delineated several features commonly associated with circRNA occurrence. CircRNA-producing genes tend to be longer and to contain more exons than average. Back-splice acceptor exons are strongly enriched at ordinal position 2 within genes, and circRNAs typically have a short exon span with two exons being the most prevalent. The flanking introns either side of circRNA loci are exceptionally long. Of note also, single-exon circRNAs derive from unusually long exons while multi-exon circRNAs are mostly generated from exons of regular length. These findings independently validate and extend similar observations made in a number of prior studies. Furthermore, we analysed high-resolution RNA polymerase II occupancy data from two separate human cell lines to reveal distinctive transcription dynamics at circRNA-producing genes. Specifically, RNA polymerase II traverses the introns of these genes at above average speed concomitant with an accentuated slow-down at exons. Collectively, these features indicate how a perturbed balance between transcription and linear splicing creates important preconditions for circRNA production. We speculate that these preconditions need to be in place so that looping interactions between flanking introns can promote back-splicing to raise circRNA production to appreciable levels.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1038/s41598-018-37037-0

Cites

88 of 88 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Average RNA Pol II velocity is higher on genes producing circRNAs than on genes not producing circRNAs, and especially on introns of these genes.

    “Indeed, the average RNA Pol II velocity is higher on genes producing circRNAs than on genes not producing circRNAs (Zhang et al, 2016) and especially on introns of these genes (Ragan et al, 2019).”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Ragan, C., Goodall, G. J., Shirokikh, N. E., & Preiss, T.
Affiliations
  • Australian National University (AU)
  • South Australia Pathology (AU)
Corresponding author
  • Shirokikh, Nikolay E.
  • Preiss, Thomas
Venue
Scientific Reports
Published
2019-02-14
Volume
9
Issue
1
Pages
2048-2048
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2914866051
Cited by
137
References
88
Citations by year
2026: 1 · 2025: 18 · 2024: 14 · 2023: 20 · 2022: 15 · 2021: 31 · 2020: 26 · 2019: 12
FWCI
6.95
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion, cc-by)
  • UniSA Research Outputs Repository (University of South Australia) (submittedVersion, other-oa)
Funders
  • Department of Health | National Health and Medical Research Council (GNT1126711)
  • Department of Education and Training | Australian Research Council (DP130101928, DP180100111)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Circular RNAs in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
Keywords
circRNA biogenesis, back-splicing, circRNA translation, microRNA sponge, RNA polymerase II occupancy, transcriptional dynamics, exon length
MeSH terms
RNA, Circular, Animals, Base Sequence, Exons, Humans, Introns, RNA, RNA Splicing, Alternative Splicing, Databases, Genetic, MicroRNAs, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review