Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Chemical modifications mark alternatively spliced and actively degrading messenger RNAs in Arabidopsis and humans

ABSTRACT: Post-transcriptional chemical modification of RNA bases is a widespread and physiologically relevant regulator of RNA maturation, stability, and function. While modifications are best characterized in short, noncoding RNAs such as transfer RNAs (tRNAs), growing evidence indicates that messenger RNAs (mRNAs) and long noncoding RNAs (lncRNAs) are likewise modified. Here, we apply our High-throughput Annotation of Modified Ribonucleotides (HAMR) pipeline to identify and classify modifications that affect Watson-Crick base-pairing at three different levels of the human and Arabidopsis thaliana transcriptomes (polyadenylated, small, and degrading RNAs). We find modifications primarily within actively degrading mRNAs and lncRNAs, suggesting they can act as a potent signal for RNA turnover. Additionally, modifications within stable mRNAs mark alternatively spliced introns, suggesting they regulate splicing. Furthermore, these modifications target mRNAs with coherent functions, including stress responses. Thus, our comprehensive analysis of RNA modification across multiple RNA classes yields new functional insights into these covalent RNA additions. polyA-selected RNA-seq, smRNA-seq, and polyA-selected global mapping of uncapped transcripts (GMUCT) in Arabidopsis thaliana; smRNA-seq in HEK293T and HeLa human cell lines.

ORGANISM(S): Homo sapiens

SUBMITTER: Lee Vandivier

PROVIDER: E-GEOD-66224 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Chemical Modifications Mark Alternatively Spliced and Uncapped Messenger RNAs in Arabidopsis.

Vandivier Lee E LE Campos Rafael R Kuksa Pavel P PP Silverman Ian M IM Wang Li-San LS Gregory Brian D BD

The Plant cell 20151111 11

Posttranscriptional chemical modification of RNA bases is a widespread and physiologically relevant regulator of RNA maturation, stability, and function. While modifications are best characterized in short, noncoding RNAs such as tRNAs, growing evidence indicates that mRNAs and long noncoding RNAs (lncRNAs) are likewise modified. Here, we apply our high-throughput annotation of modified ribonucleotides (HAMR) pipeline to identify and classify modifications that affect Watson-Crick base pairing a ...[more]

PMID: 26561561

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Project description:MicroRNA precursors (pre-miRNAs) are short hairpin RNAs that are rapidly processed into mature microRNAs (miRNAs) in the cytoplasm. Due to their low abundance in cells, sequencing-based studies of pre-miRNAs have been limited. We successfully enriched for and deep sequenced pre-miRNAs in human cells by capturing these RNAs during their interaction with Argonaute (AGO) proteins. Using this approach, we detected > 350 pre-miRNAs in human cells and > 250 pre-miRNAs in a reanalysis of a similar study in mouse cells. We uncovered widespread trimming and non-templated additions to 3â?? ends of pre-miRNAs and mature miRNAs. Additionally, we identified novel AGO2-cleaved pre-miRNAs and created an index for microRNA precursor processing efficiency. This analysis revealed a subset of pre-miRNAs that produce low levels of mature miRNAs despite abundant precursors, including an annotated miRNA in the 5â?? UTR of the DiGeorge syndrome critical region 8 (Dgcr8) mRNA transcript. This led us to search for other AGO-associated stem-loops originating from other mRNA species, which identified hundreds of putative pre-miRNAs derived from mRNA sequences in both the mouse and human transcriptomes. Intriguingly, we found that iron responsive elements in ferritin heavy and light chain mRNAs are processed into AGO-associated stem-loops in both mouse and humans but do not produce functional small RNAs. In summary, we provide a wealth of information on mammalian pre-miRNAs, and identify novel microRNA and microRNA-like elements localized in mRNAs. pre-miRNA-seq and miRNA-seq from HEK293T cells. Reanalysis of HEK293T smRNA-seq, MEF pre-miRNA and MEF smRNA-seq (processed data for these Samples are linked below). The reanalyzed HEK293T Samples are from Series GSE66224 and consists of Samples GSM1617437 and GSM1617438. The reanalyzed MEF pre-miRNA and MEF smRNA-seq Samples were downloaded from European Nucleotide Archive (http://www.ebi.ac.uk/ena/) under the accession number PRJEB6756 (ERX525474 and ERX525475). RNA-seq analysis of HEK293T cells following knockdown of DGCR8, DROSHA or Luciferase.

Dataset Information

Chemical modifications mark alternatively spliced and actively degrading messenger RNAs in Arabidopsis and humans

Publications

Chemical Modifications Mark Alternatively Spliced and Uncapped Messenger RNAs in Arabidopsis.

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