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DGCR8 HITS-CLIP reveals novel functions for the Microprocessor (CLIP-seq)

ABSTRACT: The Drosha-DGCR8 complex (Microprocessor) is required for microRNA (miRNA) biogenesis. DGCR8 contains two double-stranded RNA binding motifs that recognize the RNA substrate, whereas Drosha functions as the endonuclease. We have used high-throughput sequencing of RNAs isolated by crosslinking immunoprecipitation (HITS-CLIP) to identify endogenous RNA targets of DGCR8 in mammalian cells. Unexpectedly, miRNAs were not the most abundant targets. DGCR8-bound RNAs comprised several hundred mRNAs as well as snoRNAs and long non-coding RNAs. We found that DGCR8 together with Drosha controls the abundance of several mRNAs, as well as long non-coding RNAs, such as MALAT-1. By contrast, the DGCR8-mediated cleavage of snoRNAs is independent of Drosha, suggesting the involvement of DGCR8 in cellular complexes with other endonucleases. Interestingly, binding of DGCR8 to cassette exons, acts as a novel mechanism to regulate the relative abundance of alternatively spliced isoforms. Collectively, these data provide new insights in the complex role of DGCR8 in controlling the fate of several classes of RNAs.

ORGANISM(S): Homo sapiens

PROVIDER: GSE39086 | GEO | 2012/07/15

SECONDARY ACCESSION(S): PRJNA169928

REPOSITORIES: GEO

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DGCR8 HITS-CLIP reveals novel functions for the Microprocessor (CLIP-seq)

Project description:The Drosha-DGCR8 complex (Microprocessor) is required for microRNA (miRNA) biogenesis. DGCR8 contains two double-stranded RNA binding motifs that recognize the RNA substrate, whereas Drosha functions as the endonuclease. We have used high-throughput sequencing of RNAs isolated by crosslinking immunoprecipitation (HITS-CLIP) to identify endogenous RNA targets of DGCR8 in mammalian cells. Unexpectedly, miRNAs were not the most abundant targets. DGCR8-bound RNAs comprised several hundred mRNAs as well as snoRNAs and long non-coding RNAs. We found that DGCR8 together with Drosha controls the abundance of several mRNAs, as well as long non-coding RNAs, such as MALAT-1. By contrast, the DGCR8-mediated cleavage of snoRNAs is independent of Drosha, suggesting the involvement of DGCR8 in cellular complexes with other endonucleases. Interestingly, binding of DGCR8 to cassette exons, acts as a novel mechanism to regulate the relative abundance of alternatively spliced isoforms. Collectively, these data provide new insights in the complex role of DGCR8 in controlling the fate of several classes of RNAs. Comparison of RNAs associated to both endogenous (D8) and overexpressed (T7) DGCR8 in HEK293T cells

2012-07-15 | E-GEOD-39086 | biostudies-arrayexpress

DGCR8 acts as a novel adaptor for the exosome complex to degrade double-stranded structured RNAs

Project description:The Microprocessor complex (DGCR8/Drosha) is required for microRNA (miRNA) biogenesis but also binds and regulates the stability of several types of cellular RNAs. Of particular interest, DGCR8 controls the stability of mature small nucleolar RNA (snoRNA) transcripts independently of Drosha, suggesting the existence of alternative DGCR8 complex/es with other nucleases to process a variety of cellular RNAs. Here, we found that DGCR8 co-purifies with subunits of the nuclear exosome, preferentially associating with its hRRP6-containing nucleolar form. Importantly, we demonstrate that DGCR8 is essential for the recruitment of the exosome to snoRNAs and to human telomerase RNA. In addition, we show that the DGCR8/exosome complex controls the stability of the human telomerase RNA component (hTR/TERC). Altogether, these data suggests that DGCR8 acts as a novel adaptor to recruit the exosome complex to structured RNAs and induce their degradation.

2015-12-10 | GSE73376 | GEO

DGCR8 acts as a novel adaptor for the exosome complex to degrade double-stranded structured RNAs

2015-12-10 | E-GEOD-73376 | biostudies-arrayexpress

Endogenous shRNAs, siRNAs, and Other Microprocessor-independent, Dicer-dependent Small RNAs in Mouse ES Cells

Project description:Canonical microRNAs (miRNAs) require two processing steps: the first by the Microprocessor, a complex of DGCR8 and Drosha, and the second by Dicer. dgcr8delta/delta mouse embryonic stem cells (mESCs) have less severe phenotypes than dicer1delta/delta mESCs, suggesting a physiological role for Microprocessor-independent, Dicer-dependent small RNAs. To identify these small RNAs with unusual biogenesis, we performed high-throughput sequencing from wild type, dgcr8delta/delta, and dicer1delta/delta mESCs. Several of the DGCR8-independent, Dicer-dependent RNAs were non-canonical miRNAs. These derived from mirtrons and a newly identified subclass of miRNA precursors, which appears to be the endogenous counterpart of short hairpin RNAs (shRNAs). Our analyses also revealed endogenous siRNAs resulting from Dicer cleavage of long hairpins, the vast majority of which originated from one genomic locus with tandem, inverted short interspersed nuclear elements (SINEs). Our results extend the known diversity of mammalian small-RNA generating pathways and show that mammalian siRNAs exist in tissues outside of oocytes. Small RNAs were sequenced from wt, dgcr8(-), and dicer(-) mouse ES cells and the frequencies of small RNA types compared between the three. This record includes Illumina-platform-generated datasets from all three samples and 454-platform-generated datasets from wt and dgcr8(-) samples. [raw data files are unavailable]

2008-09-09 | E-GEOD-12521 | biostudies-arrayexpress

Global identification of target recognition and cleavage by the Microprocessor in human ESCs.

Project description:The Microprocessor plays an essential role in canonical miRNA biogenesis by facilitating cleavage of stem-loop structures in primary transcripts to yield pre-miRNAs. Although miRNA biogenesis has been extensively studied through biochemical and molecular genetic approaches, it has yet to be addressed to what extent the current miRNA biogenesis models hold true in intact cells. To address the issues of in vivo recognition and cleavage by the Microprocessor, we investigate RNAs that are associated with DGCR8 and Drosha by using immunoprecipitation coupled with next-generation sequencing. Here, we present global protein-RNA interactions with unprecedented sensitivity and specificity. Our data indicate that precursors of canonical miRNAs and miRNA-like hairpins are the major substrates of the Microprocessor. As a result of specific enrichment of nascent cleavage products, we are able to pinpoint the Microprocessor-mediated cleavage sites per se at single-nucleotide resolution. Unexpectedly, a 2-nt 3M-bM-^@M-^Y overhang invariably exists at the ends of cleaved bases instead of nascent pre-miRNAs. Besides canonical miRNA precursors, we find that two novel miRNA-like structures embedded in mRNAs are cleaved to yield pre-miRNA-like hairpins, uncoupled from miRNA maturation. Our data provide a framework for in vivo Microprocessor-mediated cleavage and a foundation for experimental and computational studies on miRNA biogenesis in living cells. CLIP-seq for DGCR8 and Drosha, RIP-seq for DGCR8, sequencing of AGO2-assocated miRNA

2014-10-02 | E-GEOD-61979 | biostudies-arrayexpress

Endogenous shRNAs, siRNAs, and Other Microprocessor-independent, Dicer-dependent Small RNAs in Mouse ES Cells

2008-09-10 | GSE12521 | GEO

A Novel role for GSK3B as a modulator of Drosha Microprocessor activity and microRNA biogenesis

Project description:Regulation of microRNA (miR) biogenesis is complex and stringently controlled. Here we identify the kinase GSK3B as an important modulator of global miR biogenesis at microprocessor level. Repression of GSK3B activity reduces Drosha activity towards pri-miRs, leading to accumulation of unprocessed pri-miRs and reduction of pre-miRs and mature miRs without altering levels or cellular localisationof miR biogenesisproteins. Conversly, GSK3B activation increases Drosha activityand mature miR accumulation. GSK3B achieves this through promoting Drosha:cofactor and Drosha:pri-miR interactions: it binds to DGCR8 and p72 in the Microprocessor, an effect dependent of RNA. Indeed GSK3B itself can immunoprecipitate pri-miRs, suggesting possible RNA binding capacity. Kinase assays identify the mechanism for GSK3B-enhansed Drosha activity, which requires GSK3B nuclear localisation, as phosphorylation of Drosha at s300 and/or s302 confirmed by enhanced Drosha activity and association with cofactors, and increased abundance of mature microRNAs in the presence of phospho-mimetic Drosha. Functional implicatons of GSK3B-enhanced miR biogenesis are illustrated by increased levels of GSK3B-upregulatd miR targets following GSK3B inhibition. These data, the first link GSK3B with the miR cascade in humans, hilight a novel pro-biogenesis role for GSK3B in increasing miR biogenesis as a component of the Microprocessor complex with wide ranging consiquences.

2016-05-20 | GSE81141 | GEO

Genome wide identification of targets of the drosha-pasha/DGCR8 complex

Project description:Drosha is a type III RNAse, which plays a critical role in miRNA biogenesis. Drosha and its double-stranded RNA-binding partner protein Pasha/DGCR8 likely recognize and cleave miRNA precursor RNAs or pri-miRNA hairpins co-transcriptionally. To identify RNAs processed by Drosha, we used tiling microarrays to examine transcripts after depletion of drosha mRNA with dsRNA in Drosophila Schneider S2 cells. This strategy identified 137 Drosha-regulated RNAs, including 11 putative pri-miRNAs comprising 15 annotated miRNAs. Most of the identified pri-miRNAs seem extremely large, >10 kilobases as revealed by both the Drosha knock down strategy and by RNA PolII chromatin IP followed by Drosophila tiling microarrays. Surprisingly, more than a hundred additional RNAs not annotated as miRNAs are under Drosha control and are likely to be direct targets of Drosha action. This is because many of them encode annotated genes, and unlike bona fide pri-miRNAs, they are not affected by depletion of the miRNA processing factor, dicer-1. Moreover, application of the evofold analysis software indicates that at least 25 of the Drosha-regulated RNAs contain evolutionarily conserved hairpins similar to those recognized by the Drosha-Pasha/DGCR8 complex in pri-miRNAs. One of these hairpins is located in the 5′ UTR of both pasha and mammalian DGCR8. These observations suggest that a negative feedback loop acting on pasha mRNA may regulate the miRNA-biogenesis pathway: i.e., excess Drosha cleaves pasha/DGCR8 primary transcripts and leads to a reduction in pasha/DGCR8 mRNA levels and Pasha/DGCR8 synthesis. Keywords: time course, ChIP-chip

2008-12-25 | GSE14215 | GEO

RNAi of human HeLa cells knocked down for Drosha or DGCR8

Project description:Anaysis of mRNA changes in HeLa cells following knockdown of Drosha or DGCR8. Drosha is a nuclear RNase III that carries out microRNA (miRNA) processing by cleaving primary microRNA transcript (pri-miRNA). DGCR8 is an essential co-factor of Drosha. Experiment Overall Design: siRNA against Drosha or DGCR8 were trasnfected into HeLa cells. siRNA against GFP was used as a control. Biologically duplicated total RNAs were prepared from HeLa cells, 24 hrs and 48 hrs after siRNA transfection.

2009-02-21 | E-GEOD-13639 | biostudies-arrayexpress

Regulation of Microprocessor assembly and localization via Pasha’s WW domain in C. elegans

Project description:Primary microRNA (pri-miRNA) transcripts are processed by a protein complex called the Microprocessor comprised of the ribonuclease Drosha and its RNA binding partner DGCR8/Pasha. We sequenced small RNAs from animals containing a mutation in the WW domain of C. elegans pash-1. We found that these mutants have a modest but widespread reduction in miRNA levels when grown at 20˚C, which is further enhanced when grown at 25˚C. The results demonstrate a requirement for the WW domain in processing miRNAs in C. elegans.

2024-04-16 | GSE263914 | GEO

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