Identification and characterization of MCF01A circular RNAs [ChIP-seq]
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE71196 | GEO | 2015/12/17
SECONDARY ACCESSION(S): PRJNA290558
REPOSITORIES: GEO
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Project description:Circular RNAs (circRNAs) are widespread circular forms of non-coding RNAs with largely unknown function. Because stimulation of mammary cells with the epidermal growth factor (EGF) leads to dynamic changes in the abundance of both coding and non-coding RNA molecules, and culminates in the acquisition of a robust migratory phenotype, this cellular model might disclose functions of circRNAs. Here we show that circRNAs of EGF-stimulated mammary cells are stably expressed, while mRNAs and micro-RNAs change within minutes. In general, the circRNAs we detected are relatively long-lived and weakly expressed. Interestingly, they are almost ubiquitously co-expressed with the corresponding linear transcripts, and the respective, shared promoter regions are more active compared to genes producing linear isoforms only. These findings imply that altered abundance of circRNAs, unlike changes in the levels of other RNAs, might not play critical roles in signaling cascades and downstream transcriptional networks that rapidly commit cells to specific outcomes. Detection of circRNAs from RNA-Seq â triplicate
2015-12-17 | E-GEOD-71195 | biostudies-arrayexpress
Project description:Circular RNAs (circRNAs) are widespread circular forms of non-coding RNAs with largely unknown function. Because stimulation of mammary cells with the epidermal growth factor (EGF) leads to dynamic changes in the abundance of both coding and non-coding RNA molecules, and culminates in the acquisition of a robust migratory phenotype, this cellular model might disclose functions of circRNAs. Here we show that circRNAs of EGF-stimulated mammary cells are stably expressed, while mRNAs and micro-RNAs change within minutes. In general, the circRNAs we detected are relatively long-lived and weakly expressed. Interestingly, they are almost ubiquitously co-expressed with the corresponding linear transcripts, and the respective, shared promoter regions are more active compared to genes producing linear isoforms only. These findings imply that altered abundance of circRNAs, unlike changes in the levels of other RNAs, might not play critical roles in signaling cascades and downstream transcriptional networks that rapidly commit cells to specific outcomes. Histone 3 Lysine 27 Acetylation â 2 replicates
2015-12-17 | E-GEOD-71196 | biostudies-arrayexpress
Project description:Circular RNAs (circRNAs) are widespread circular forms of non-coding RNAs with largely unknown function. Because stimulation of mammary cells with the epidermal growth factor (EGF) leads to dynamic changes in the abundance of both coding and non-coding RNA molecules, and culminates in the acquisition of a robust migratory phenotype, this cellular model might disclose functions of circRNAs. Here we show that circRNAs of EGF-stimulated mammary cells are stably expressed, while mRNAs and micro-RNAs change within minutes. In general, the circRNAs we detected are relatively long-lived and weakly expressed. Interestingly, they are almost ubiquitously co-expressed with the corresponding linear transcripts, and the respective, shared promoter regions are more active compared to genes producing linear isoforms only. These findings imply that altered abundance of circRNAs, unlike changes in the levels of other RNAs, might not play critical roles in signaling cascades and downstream transcriptional networks that rapidly commit cells to specific outcomes.
2015-12-17 | GSE71195 | GEO
Project description:Purpose: To investigate the role and mechanism of mRNAs, long chain non-coding RNAs and circular RNAs in gastric cancer. Methods: RNA-seq of ribosomal RNA-depleted total RNA were performed to screen differential expressed mRNAs, long chain non-coding RNAs between paired gastric cancer tissues and adjacent normal tissues.For the linear RNA was digested with 3 U of RNase R per µg of RNA. Results: A total of 83672 mRNAs, 105998 long chain non-coding RNAs, 25441 distinct circRNAs were identified in these samples, and 13929 of these circRNAs were identified as novel circRNAs.
2022-03-15 | GSE193453 | GEO
Project description:The recent reports of two circular RNAs (circRNAs) with strong potential to act as microRNA (miRNA) sponges suggest that circRNAs might play important roles in regulating gene expression. However, the global properties of circRNAs are not well understood. We developed a computational pipeline to identify circRNAs and quantify their relative abundance from RNA-seq data. Applying this pipeline to a large set of non-poly(A)-selected RNA-seq data from the ENCODE project, we annotated 7,112 human circRNAs that were estimated to comprise at least 10% of the transcripts accumulating from their loci. Most circRNAs are expressed in only a few cell types and at low abundance, but they are no more cell-type–specific than are mRNAs with similar overall expression levels. Although most circRNAs overlap protein-coding sequences, ribosome profiling provides no evidence for their translation. We also annotated 635 mouse circRNAs, and although 20% of them are orthologous to human circRNAs, the sequence conservation of these circRNA orthologs is no higher than that of their flanking linear exons. The previously proposed miR-7 sponge, CDR1as, is one of only two circRNAs with more miRNA sites than expected by chance, with the next best miRNA-sponge candidate deriving from a primate-specific zinc-finger gene, ZNF91. These results provide a new framework for future investigation of this intriguing topological isoform while raising doubts regarding a biological function of most circRNAs. Examination of 9 samples in 1 cell type Note: The ENCODE data we used are under GEO SuperSeries GSE26284 (all samples labeled "_cell_total"). But they were not used in the processing of the U2OS data.
2014-07-08 | E-GEOD-51584 | biostudies-arrayexpress
Project description:Covalently closed circular RNA molecules (circRNAs) have recently emerged as a class of RNA isoforms with widespread and tissue specific expression across animals, oftentimes independent of the corresponding linear mRNAs. circRNAs are remarkably stable and sometimes highly expressed molecules. Here, we sequenced RNA in human peripheral whole blood to determine the potential of circRNAs as biomarkers in an easily accessible body fluid. We report the reproducible detection of thousands of circRNAs. Importantly, we observed that hundreds of circRNAs are much higher expressed than corresponding linear mRNAs. Thus, circRNA expression in human blood reveals and quantifies the activity of hundreds of coding genes not accessible by classical mRNA specific assays. Our findings suggest that circRNAs could be used as biomarker molecules in standard clinical blood samples. Sequencing of blood RNA from five healthy individuals (biological replicates) plus technical replicate of one sample and detection of circRNAs.
2015-10-26 | E-GEOD-73570 | biostudies-arrayexpress
Project description:Purpose: A novel member of RNAs, circular RNAs (circRNAs), has recently been evidenced to play key role on biological process regulation. However, the global landscape of circular RNA remains largely unknown. In the present study, deep RNA-sequencing technique was employed to identify and characterize the circular RNAs expressed in lactating rat mammary gland.compare NGS-derived retinal transcriptome profiling (RNA-seq) to microarray and quantitative reverse transcription polymerase chain reaction (qRT–PCR) methods and to evaluate protocols for optimal high-throughput data analysis Methods:Deep RNA-sequencing technique was employed Results: A total of 6824 and 4523 circRNAs were identified from rat mammary glands at two lactation stages, respectively. Numerous circRNAs seem to be specifically expressed in different lactation stages, as only 1314 circRNAs were detected in both libraries. Majority of the candidate circRNAs maps to intronic and intergenic regions, namely noncoding regions. There existed the circular preference or specificity of some genes. Interestingly, 4 protein coding genes (Rev3l, IGSF11, MAML2, and LPP) that also tanscripted high level circRNAs have been reported to be involved in cancer. The distribution of specific miRNA binding sites and RNA binding proteins binding sites also implied the role of circRNAs in mammary gland development and tumorigenesis. Conclusions:The results provide the basis for comparisons with breast cancer profiles and for selection of representative circRNA candidates for future functional characterization in breast development and breast cancer.
2017-08-20 | GSE60539 | GEO
Project description:Circular RNAs (circRNAs), formed by the atypical head-to-tail splicing of exons, have re-emerged as a potentially interesting RNA species given recent reports of a surprising diversity and abundance of circRNA in organisms ranging from worm to human. Here, using deep RNA sequencing, we profiled different RNA species in mouse and observed that circRNAs are significantly enriched in neural tissue, relative to other tissues. Using PacBio sequencing, we determined, for the first time, the circular structure of this population of circRNAs as well as their full-length sequences. We discovered that a disproportionate fraction of the brain circRNA population is derived from host genes that code for synaptic proteins. Moreover, based on the separate profiling of the RNAs localized in neuronal cell bodies and neuropil (enriched in axons and dendrites), we found that, on average, circular RNAs are more enriched in the neuropil than their host gene mRNA isoforms. Using high resolution in situ hybridization we, for the first time, directly visualized circRNA punctae in the dendrites of neurons. The host gene origin and location of the circRNA in neurons suggest the possibility that circRNAs might participate in the regulation of synaptic function and plasticity. Consistent with this idea, we observed via profiling at different developmental stages, that the abundance of many circular RNAs changes abruptly at a time corresponding to synaptogenesis. In addition, following a homeostatic downscaling of neuronal activity many circRNAs exhibit significant up or down-regulation. These data indicate that brain circRNAs are positioned to respond to and regulate synaptic function. Circular RNA profiling in 13 different samples in mice and four samples in rat, using Illumina sequencing
2015-02-25 | E-GEOD-61991 | biostudies-arrayexpress
Project description:Circular RNAs (circRNAs) are numerically abundant in human, predominantly derived from protein coding genes, and some can act as microRNA sponges or cis-acting transcriptional regulators. Changes in circRNA abundance have been identified during human development which may be functionally important, but lineage-specific analyses are currently lacking. To address this, we performed RNAseq analysis of human embryonic stem (ES) cells differentiated for 90 days towards 3D laminated retina. A transcriptome-wide increase in circRNA abundance, size, and exon count was observed which reached a plateau by day 45. Parallel analyses, controlling for sample and locus specific effects, identified 239 circRNAs with expression patterns distinct from the transcriptome-wide pattern, but these also increased in abundance over time. Surprisingly, circRNAs derived from long non-coding RNAs (lncRNAs) were found to account for a significantly larger proportion of transcripts from their loci of origin than circRNAs from coding genes. The most abundant, circRMST:E12-E6, showed a >100X increase during differentiation which was associated with altered promoter usage, and accounts for >99% of RMST transcripts in many adult tissues. The second most abundant, circFIRRE:E10-E5, accounts for >98% of FIRRE transcripts in differentiating human ES cells, and is one of 39 FIRRE circRNAs many of which include multiple unannotated exons. Our results suggest that during human ES cell differentiation, changes in circRNA abundance are primarily globally controlled. They also suggest that RMST and FIRRE, genes with established roles in neurogenesis and topological organisation of chromosomal domains respectively, encode circular lncRNAs with only minor linear species.
2018-03-28 | GSE89957 | GEO
Project description:Circular RNAs (circRNAs) were shown to be expressed in all human tissue but detailed insight in circRNA diversity among tissues and cellular differentiation stages is lagging behind. This study provides comprehensive data on circRNA expression in the three major mature blood cell populations of healthy subjects. Over 36,000 circRNAs were identified in B-cells, T-cells and monocytes, 34% of which were novel. In addition, putative new genes producing circRNAs were uncovered. The definition of cell type specific circRNA expression signatures revealed that alternative circularization is a common phenomenon showing cell population specific patterns. Abundance of circRNAs resulted largely uncorrelated to host gene linear expression. Several circRNAs were validated, including circular isoforms expressed by leukemia-associated genes PAX5 and IKZF1. These results and new data will help to further our understanding of molecular mechanisms underlying cell biology of blood cells, and are a reference to explore circRNA alterations in haematological diseases.
2019-12-17 | GSE110159 | GEO