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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Small RNAs in H9 embryonic stem cells

ABSTRACT: Non-templated 3'-end oligouridylation of RNA occurs in many species, including humans. Unlike the familiar phenomenon of polyadenylation, non-templated addition of uridines to RNA is poorly characterized in higher eukaryotes. Recent studies have reported non-templated 3'-end oligouridylation of small RNAs and mRNAs. Oligouridylation is involved in many aspects of microRNA biology from biogenesis to turnover of the mature species and it may also mark long mRNAs for degradation by promoting decapping of the protective 5'-cap structure. To determine the prevalence of oligouridylation in higher eukaryotes, we used next-generation sequencing technology to deeply examine the population of small RNAs in human cells. Our data revealed widespread non-templated nucleotide addition to the 3'-ends of many classes of RNA, with short stretches of uridine being the most frequently added nucleotide. Strand-specific RNA-Seq and paired-end sequencing was used to directly analyze the 3'-ends of small RNAs to identify post-transcriptional RNA processing.

ORGANISM(S): Homo sapiens

SUBMITTER: Yun Choi

PROVIDER: E-GEOD-31051 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Widespread RNA 3'-end oligouridylation in mammals.

Choi Yun S YS Patena Weronika W Leavitt Andrew D AD McManus Michael T MT

RNA (New York, N.Y.) 20120130 3

Nontemplated 3'-end oligouridylation of RNA occurs in many species, including humans. Unlike the familiar phenomenon of polyadenylation, nontemplated addition of uridines to RNA is poorly characterized in higher eukaryotes. Recent studies have reported nontemplated 3'-end oligouridylation of small RNAs and mRNAs. Oligouridylation is involved in many aspects of microRNA biology from biogenesis to turnover of the mature species, and it may also mark long mRNAs for degradation by promoting decappin ...[more]

PMID: 22291204

Similar Datasets

Small RNAs in H9 embryonic stem cells

Project description:Non-templated 3'-end oligouridylation of RNA occurs in many species, including humans. Unlike the familiar phenomenon of polyadenylation, non-templated addition of uridines to RNA is poorly characterized in higher eukaryotes. Recent studies have reported non-templated 3'-end oligouridylation of small RNAs and mRNAs. Oligouridylation is involved in many aspects of microRNA biology from biogenesis to turnover of the mature species and it may also mark long mRNAs for degradation by promoting decapping of the protective 5'-cap structure. To determine the prevalence of oligouridylation in higher eukaryotes, we used next-generation sequencing technology to deeply examine the population of small RNAs in human cells. Our data revealed widespread non-templated nucleotide addition to the 3'-ends of many classes of RNA, with short stretches of uridine being the most frequently added nucleotide.

2012-03-21 | GSE31051 | GEO

Argonaute and Trimmer generate Dicer-independent priRNAs and nucleate RNAi

Project description:RNA interference is involved in silencing of transposable and repetitive elements. How these elements are initially recognized by RNAi is a fundamental and unanswered question. We previously identified a class of Dicer-independent small RNAs, called primal small RNAs (priRNAs), in fission yeast. The mechanism by which Dicer-independent small RNAs are generated is not clear for any species. Here we reconstitute priRNA biogenesis in vitro and demonstrate that priRNAs can nucleate RNAi in vivo. We identify 3'-5' exonuclease Trimmer and show that Argonaute, loaded with longer RNA precursors, recruits Trimmer to generate the new 3' end. Next, we show that antisense priRNAs accumulate in rrp6M-NM-^T cells and nucleate RNAi at subset of protein coding genes in a Trimmer- and priRNA-dependent manner. Thus, Rrp6-mediated degradation of antisense transcripts and priRNA precursors protects the genome from spurious RNAi. Our results suggest that Argonaute association with random RNA degradation products triggers RNAi in a process of transcriptome surveillance. small RNA profiling in wild type S. pombe cells and in mutant cells

2014-04-21 | E-GEOD-38636 | biostudies-arrayexpress

Sequence analysis of scnRNAs

Project description:The developmentally regulated 26- to 32-nt siRNAs (scnRNAs) are loaded to the Argonaute protein Twi1p and display a strong bias for uracil at the 5' end. In this study, we used deep sequencing to analyze loaded and unloaded populations of scnRNAs. We show that the size of the scnRNA is determined during a pre-loading process, whereas their 5' uracil bias is attributed to both pre-loading and loading processes. We also demonstrate that scnRNAs have a strong bias for adenine at the third base from the 3' terminus, suggesting that most scnRNAs are direct Dicer products. Furthermore, we show that the thermodynamic asymmetry of the scnRNA duplex does not affect the guide and passenger strand decision. Finally, we show that scnRNAs frequently have templated uracil at the last base without a strong bias for adenine at the second base indicating non-sequential production of scnRNAs from substrates. These findings provide a biochemical basis for the varying attributes of scnRNAs, which should help improve our understanding of the production and turnover of scnRNAs in vivo. We compared Twi1p-loaded scnRNAs to scnRNAs before they have been loaded into Twi1p by deep sequencing to understand how the two processes, the production of siRNAs by Dicer and the loading of siRNAs into Argonaute, shape the population of siRNAs in vivo.

2013-06-05 | E-GEOD-47650 | biostudies-arrayexpress

RNA targets of FASTKD2 in Human HEK293 cells

Project description:A mutation within FASTKD2 causes a rare form of Mendelian mitochondrial encephalomyopathy. To investigate whether and how RNA binding of FASTKD2 contributes to the disease phenotype, we identified the RNA targets of FASTKD2 by iCLIP.

2015-11-09 | E-MTAB-4010 | biostudies-arrayexpress

EnD-Seq and AppEnD: Sequencing 3' ends to identify non-templated tails and degradation intermediates

Project description:EnD-Seq and AppEnD: Sequencing 3' ends to identify non-templated tails and degradation intermediates

| PRJNA282807 | ENA

EnD-Seq and AppEnD: Sequencing 3' ends to identify non-templated tails and degradation intermediates

Project description:EnD-Seq and AppEnD: Sequencing 3' ends to identify non-templated tails and degradation intermediates

| PRJNA497386 | ENA

Analysis of conjugation-specific 26-32nt siRNAs of Tetrahymena thermophila

Project description:Distinct classes of small RNAs are often selectively sorted to different Argonaute proteins. Various properties of small RNAs, such as length, terminal nucleotide, thermodynamic asymmetry and duplex mismatches, can impact sorting in different RNA silencing pathways in diverse eukaryotes. The developmentally regulated ~26-32 nt siRNAs, which are involved in programmed DNA elimination in Tetrahymena, show a strong bias for uracil at the 5' end. In this study, we analyzed loaded and unloaded populations of ~26-32 nt siRNAs by deep RNA sequencing. We show that the production process is the main determinant of size, whereas the 5' uracil bias is attributed not only to the process of loading siRNAs into the Argonaute protein Twi1p but also significantly to the initial processing of the siRNAs. We also show that both the loaded and the unloaded ~26-32 nt siRNAs have a strong bias for adenine as the 3rd base from the 3' terminus, suggesting that most of these siRNAs are direct Dicer products and little post-processing amplification of this class of siRNAs occurs. Further, we demonstrate that the siRNA-loading process in vivo can be deduced from the fraction of siRNAs with uracil as the first base. These findings provide biochemical bases for the attributes of ~26-32 nt siRNAs, which should help improve our understanding of their production and turnover in vivo. Examination of siRNA populations in wild-type and TWI1 KO Tetrahymena cells

2012-10-01 | E-GEOD-37696 | biostudies-arrayexpress

Argonaute Surveillance and Dicer-Independent priRNAs TriggerRNAi and Heterochromatin Formation

Project description:The assembly of fission yeast pericentromeric heterochromatin and generation of small interfering RNAs (siRNAs) from noncoding centromeric transcripts are mutually dependent processes. How this interdependent positive feedback loop is first triggered is a fundamental unanswered question. Here we show that two distinct Argonaute (Ago1)-dependent pathways mediate small RNA generation. RNA-dependent RNA polymerase complex (RDRC) and Dicer act on specific noncoding RNAs to generate siRNAs by a mechanism that requires the slicer activity of Ago1 but is independent of pre-existing heterochromatin. In the absence of RDRC or Dicer, a distinct class of small RNAs, called primal small RNAs (priRNAs), associate with Ago1. priRNAs are degradation products of abundant transcripts, which bind to Ago1 and target antisense transcripts that result from bidirectional transcription of DNA repeats. Our results suggest that a transcriptome surveillance mechanism based on the random association of RNA degradation products with Argonaute triggers siRNA amplification and heterochromatin assembly within DNA repeats. small RNA profiling in wild type S. pombe cells and in 12 mutant cells

2010-02-23 | E-GEOD-19734 | biostudies-arrayexpress

Ultra-high throughput sequencing-based small RNA discovery and discrete statistical biomarker analysis in a collection of cervical tumors and matched controls

Project description:We prepared small RNA libraries from 29 tumor/normal pairs of human cervical tissue samples. Analysis of the resulting sequences (42 million in total) defined 64 new human microRNA (miRNA) genes. Both arms of the hairpin precursor were observed in twenty-three of the newly identified miRNA candidates. We tested several computational approaches for analysis of class differences between high throughput sequencing datasets, and describe a novel application of log linear model that has provided the most datasets, and describe a novel application of log linear model that has provided the most effective analysis for this data. This method resulted in the identification of 67 miRNAs that were differentially-expressed between the tumor and normal samples at a false discovery rate less than 0.001. A total of 29 tumor/normal pairs of human cervical tissue samples were analyzed. Two samples (G699N_2 and G761T_2) were performed in duplicates. No Fastq files for GSM532871 to GSM532889, GSM532929, and GSM532930. Sequence files are provided as text files for these 22 Sample records in GSE20592_RAW.tar. 38 samples with quality scores are available from SRA as SRP002/SRP002326 (see Supplementary file below).

2010-04-28 | E-GEOD-20592 | biostudies-arrayexpress

In vitro evolution of Pseudomonas aeruginosa AA2 biofilms in the presence of cystic fibrosis lung microbiome members

Project description:P. aeruginosa was cultured in a MultiScreen-Mesh plate, which has a filter at the bottom of the wells. The plate was immersed in either in medium alone (control) or in medium inoculated with a mixture of five bacterial strains commonly found in cystic fibrosis sputum (\"microbiome\"). The filter prevented physical contact between P. aeruginosa and the other bacteria, yet soluble products could migrate through the filter into the P. aeruginosa biofilm. P. aeruginosa was then allowed to form biofilms in the wells for 72h, then the biofilm was harvested and a fraction of the harvested cells were used for re-inoculations. This was repeated for 18 cycles for a total of 54 days.

2019-09-13 | E-MTAB-7331 | biostudies-arrayexpress

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