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Open AccessJournal ArticleDOI

Circular RNAs Are the Predominant Transcript Isoform from Hundreds of Human Genes in Diverse Cell Types

TLDR
By deep sequencing of RNA from a variety of normal and malignant human cells, this work suggests that a non-canonical mode of RNA splicing, resulting in a circular RNA isoform, is a general feature of the gene expression program in human cells.
Abstract
Most human pre-mRNAs are spliced into linear molecules that retain the exon order defined by the genomic sequence. By deep sequencing of RNA from a variety of normal and malignant human cells, we found RNA transcripts from many human genes in which the exons were arranged in a non-canonical order. Statistical estimates and biochemical assays provided strong evidence that a substantial fraction of the spliced transcripts from hundreds of genes are circular RNAs. Our results suggest that a non-canonical mode of RNA splicing, resulting in a circular RNA isoform, is a general feature of the gene expression program in human cells.

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Citations
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Journal ArticleDOI

Predicting disease-associated circular RNAs using deep forests combined with positive-unlabeled learning methods.

TL;DR: This study proposes the use of deep forests combined with positive-unlabeled learning methods to predict potential disease-related circRNAs and provided a new framework to investigate the associations between circRNA and disease and might improve the understanding of its functions.
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Biogenesis of circular RNAs and their roles in cardiovascular development and pathology

TL;DR: The latest research on the biogenesis and functions of circRNAs with emphasis on the regulatory roles of circ RNAs in the development and pathologies of the cardiovascular system is summarized.
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Noncoding RNA in Oncogenesis: A New Era of Identifying Key Players

TL;DR: The function and regulation of miRNAs are discussed, especially focusing on the interplay between mi RNAs and several key cancer genes, including p53, PTEN and c-Myc, and the research of long ncRNAs (lncRNAs) in cancers is summarized.
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NCLscan: accurate identification of non-co-linear transcripts (fusion, trans-splicing and circular RNA) with a good balance between sensitivity and precision

TL;DR: A new NCL-transcript-detecting method (‘NCLscan’) was developed, which utilized a stepwise alignment strategy to almost completely eliminate false calls without sacrificing true positives, enabling NCLscan to outperform 18 other publicly-available tools in terms of sensitivity and precision.
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Integrative transcriptome sequencing identifies trans-splicing events with important roles in human embryonic stem cell pluripotency

TL;DR: A new computational pipeline, TSscan, is developed, which integrates different types of high-throughput long-/short-read transcriptome sequencing of different human embryonic stem cell (hESC) lines to effectively minimize false positives while detecting trans-splicing.
References
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Journal ArticleDOI

A coding-independent function of gene and pseudogene mRNAs regulates tumour biology

TL;DR: It is found that PTENP1 is biologically active as it can regulate cellular levels of PTEN and exert a growth-suppressive role, and this analysis extended to other cancer-related genes that possess pseudogenes, and revealed a non-coding function for mRNAs.
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Circular transcripts of the testis-determining gene Sry in adult mouse testis

TL;DR: It is suggested that the circles arise from normal splicing processes as a consequence of the unusual genomic structure surrounding the Sry locus in the mouse.
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Mis-splicing yields circular RNA molecules.

TL;DR: To the knowledge, this is the first case of circular transcripts being processed from nuclear pre‐mRNA in eukaryotes, and might represent a novel aspect of gene expression and hold some interesting clues about the splicing mechanism.
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miRNA-dependent gene silencing involving Ago2-mediated cleavage of a circular antisense RNA

TL;DR: This study provides the first evidence for non‐coding antisense transcripts as functional miRNA targets, and a novel regulatory mechanism involving a positive correlation between mRNA and antisense circular RNA levels.
Journal ArticleDOI

Expression of Linear and Novel Circular Forms of an INK4/ARF-Associated Non-Coding RNA Correlates with Atherosclerosis Risk

TL;DR: The results identify novel circular RNA products emanating from the ANRIL locus and suggest causal variants at 9p21.3 regulate INK4/ARF expression and ASVD risk by modulating ANRil expression and/or structure.
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