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SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production (miRNA-Seq)

ABSTRACT: We performed Illumina sequencing of sRNA libraries prepared from leaves of adult plants in Arabidopsis. Chromatin remodeling factor 2 (CHR2) positively regulates transcription of MIR loci whereas repressing microRNA (miRNA) accumulation in vivo. CHR2 can directly bind to and unwind primary miRNAs (pri-miRNAs) and inhibit their processing; and this inhibition entails its remodeling activity in vitro and in vivo.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE108858 | GEO | 2018/05/18

SECONDARY ACCESSION(S): PRJNA428977

REPOSITORIES: GEO

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SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production DMS-MaPseq)

Project description:Here we present dimethyl sulfate mutational profiling with sequencing (DMS-MaPseq) prepared from leaves of adult plants in Arabidopsis. Chromatin remodeling factor 2 (CHR2) positively regulates transcription of MIR loci whereas repressing microRNA (miRNA) accumulation in vivo. CHR2 can directly bind to and unwind primary miRNAs (pri-miRNAs) and inhibit their processing; and this inhibition entails its remodeling activity in vitro and in vivo.

2018-05-18 | GSE108857 | GEO

SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production

Project description:SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production

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SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production (miRNA-Seq)

Project description:SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production (miRNA-Seq)

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SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production DMS-MaPseq)

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SWI/SNF subunit CHR2 remodels pri-miRNAs via microprocessor component SE to inhibit miRNA production

Project description:This SuperSeries is composed of the SubSeries listed below.

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NEAT1 scaffolds RNA-binding proteins and the Microprocessor to globally enhance pri-miRNA processing.

Project description:MicroRNA (miRNA) biogenesis is known to be modulated by a variety of RNA-binding proteins (RBPs), but in most cases, individual RBPs appear to influence the processing of a small subset of target miRNAs. Here, we report that the RNA-binding NONO-PSF heterodimer binds a large number of expressed pri-miRNAs in HeLa cells to globally enhance pri-miRNA processing by the Drosha-DGCR8 Microprocessor. NONO and PSF are key components of paraspeckles organized by the long noncoding RNA (lncRNA) NEAT1. We further demonstrate that NEAT1 also has a profound effect on global pri-miRNA processing. Mechanistic dissection reveals that NEAT1 broadly interacts with the NONO-PSF heterodimer as well as many other RBPs and that multiple RNA segments in NEAT1, including a 'pseudo pri-miRNA' near its 3' end, help attract the Microprocessor. These findings suggest a 'bird nest' model in which an lncRNA orchestrates efficient processing of potentially an entire class of small noncoding RNAs in the nucleus.

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Single cut products of Microprocessor on pri-miRNAs

Project description:The human Microprocessor complex cleaves primary microRNA (miRNA) transcripts (pri-miRNAs) to initiate miRNA synthesis. Microprocessor consists of DROSHA (an RNase III enzyme), and DGCR8. DROSHA has two conserved RNase III domains, which make double cuts on each of pri-miRNA strands. In this study, we show that Microprocessor has an unexpected single-cut activity, which creates a single cut on just one of the pri-miRNA strands using one of the two RNase III domains of DROSHA. This cleavage does not lead to the production of miRNA but instead it downregulates miRNA expression. We also demonstrate that certain RNA elements facilitate the single-cut activity of Microprocessor, and by manipulating these elements, we can regulate the ratio of single-cut to double-cut activities, thus controlling miRNA production both in vitro and in vivo.

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