AGO2 immunoprecipitation RNA-seq in T-ALL cell lines
Ontology highlight
ABSTRACT:
INSTRUMENT(S): Illumina NovaSeq 6000
ORGANISM(S): Homo sapiens
SUBMITTER: Alessia Buratin
PROVIDER: E-MTAB-16337 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:MiR-21 is an important suppressor of T-cell apoptosis that is also widely overexpressed in many types of cancers. The exact mechanisms related to the anti-apoptotic effect of miR-21 is not well understood. In this study, we applied AGO2 RNA Immunoprecipitation followed by gene expression profiling (RIP-Chip) in Jurkat cells to identify apoptosis-associated miR-21 target genes. We showed that expression of miR-21 rapidly increases upon αCD3/αCD28 activation of Jurkat cells. Inhibition of miR-21 resulted in reduced cell growth and induced apoptosis. Upon AGO2-RIP-Chip, we observed an overall increased enrichment of miR-21 target genes in the IP fraction of miR-21-overexpressing Jurkat cells as compared to the IP fraction of empty vector control cells. We noted a systematic decrease in transcript levels of predicted miR-21 target genes compared to EV control. We identified 72 genes that were 2-fold enriched in the AGO2-IP fraction of miR-21-overexpressing cells that contained a predicted miR-21 binding site. Of these, 71 were enriched 2-fold more in the miR-21-overexpressing cells as compared to EV Jurkat cells. The target gene for which the enrichment was most prominently increased upon miR-21 overexpression was the pro-apoptotic protein LATS1. Luciferase reporter assays confirmed direct targeting of the LATS1 3'UTR by miR-21. In line with the luciferase results, Western blot analysis revealed a decrease in LATS1 upon miR-21 inhibition. LATS1 qRT-PCR analysis in primary T-cells showed that LATS1 levels decrease upon T-cell stimulation while the miR-21 levels increase. Collectively, these data identify the miR-21 target LATS1 as a likely candidate whose inhibition contributes to the anti-apoptotic function of miR-21 in T-cells and perhaps also many types of cancers. Gene expression array on Jurkat cells overexpressing miR-21 and empty vector (EV).
2016-08-03 | E-GEOD-85116 | biostudies-arrayexpress
Project description:The aim of the study is to identify miRNA targets in Hodgkin lymphoma cell lines. By immunoprecipitation of wild type Ago2, it is expected to pull down the Ago2 associated gene transcripts. Through microarray analysis, the Ago2 associated gene transcripts identified are expected to be miRNA targets. Keywords: Ribonucleoprotein Immunoprecipitation - Gene Chip (RIP-Chip) RNA isolated from the Ago2 immunoprecipitated (IP) fraction is hybridized against the RNA from total cell lysate (T) fraction. The experiment is performed in two independent Hodgkin lymphoma cell lines, L1236 and L428. In addition, RNA of flow through (FT) fraction of L1236 is hybridized against RNA of total cell lysate (T) fraction of L1236 to demonstrate the specificity/enrichment seen in the IP fraction and not in the FT fraction. All hybridizations is done with a dye swap design.
2010-04-08 | E-GEOD-14409 | biostudies-arrayexpress
Project description:We report that microRNAs strongly regulate targets of exceptionally high affinity and that such targets can be identified upon microRNA silencing in Argonaute 2 ribonucleoprotein immunoprecipitation (Ago2-RIP) experiments
2017-08-03 | E-MTAB-5386 | biostudies-arrayexpress
Project description:We established a neuron-specific Argonaute2:GFP-RNA immunoprecipitation followed by high throughput sequencing (AGO2-RIP-seq) to analyse the regulatory role of miRNAs in mouse hippocampal neurons. Using this technique, we identified more than two thousand miRNA target genes in hippocampal neurons, regulating essential neuronal features such as axon guidance and transcription. Furthermore, we found that stable inhibition of the highly expressed miR-124 in hippocampal neurons led to significant changes in the AGO2 binding of target mRNAs, resulting in subsequent upregulation of numerous miRNA target genes. Our data suggest that target redundancies are common among microRNA families. Together, these findings greatly enhance our understanding of the mechanisms and dynamics through which miRNAs regulate their target genes in neurons. Analysis of the miRNA targetome in hippocampal neurons after inhibition of 2 different miRNAs. AAV5 injections into the hippocampus of adult C57BL/6 mice producing either of the following under a synapsin promoter: GFP only (Samples beginning with 'GFP124…' or 'GFP125…'), GFP-miR124sp (Samples beginning with 'miR124…'), GFP-miR125sp (Samples beginning with 'miR125…'), GFP-AGO2-miR292sponge (samples ending with '…292'), GFP-AGO2-miR124sponge (samples ending with '…124'), GFP-AGO2-miR125sponge (samples ending with '…125'). All other samples were sham-injected.
2015-07-31 | E-GEOD-65543 | biostudies-arrayexpress
Project description:Compared gene enrichment in Ago2-RNA immunopreciptant between wildtype and Mir140-null chondrocytes Identified Mir140 targets that are most exclusively regulated by Mir140 Biological duplicate. Total RNA and Ago2-immunoprecipitated RNA were prepared from the same primary chondrocyte culture. Chondrocytes were isolated from newborn mouse rib and cultured overnight in 10%FCS-containing medium. Total RNA and Ago2-immunoprecipitated RNA were amplified using Ovation pico, and subjected to microarray analysis (HT-mouse 430 PM). Two sets of experiments (two samples from wildtype mice for total RNA and Ago2 immunoprecipitated RNA, and two samples from Mir140-null mice for total RNA and Ago2 immunoprecipitated RNA) were performed (a total of 8 chips)
2011-06-01 | E-GEOD-27177 | biostudies-arrayexpress
Project description:Transgenic Arabidopsis plants (AGO2::HA:AGO2) were treated with either mock (10 mM MgCl2) or Pseudomonas syringae pv. tomato (Pst) expressing avrRpt2 (R2) at a concentration of 2 x 107 cfu/ml for 14 hours. sRNAs associated with AGO1 and AGO2 were co-immunoprecipitated using antibodies against either AGO1 (AGO1-IP), or HA (hemagglutinin) (AGO2-IP). As controls, we also gel-purified the 18-28 nt fraction of the total RNAs from an AGO2 mutant (ago2-1). The co-immunoprecipitated or gel-purified RNAs were cloned and sequenced by Illumina deep sequencing. Examination of AGO-associated sRNAs in pathogen-treated or control plants
2011-05-10 | E-GEOD-26161 | biostudies-arrayexpress
Project description:miRNA-mediated gene expression silencing has previously been shown to be important for a variety of physiological and pathological processes. Here, we have explored the role of one bona fide human-specific miRNA (miR-941) in evolution of the human-specific expression and function. Using combination of high-throughput sequencing (GSE26545), miRNA transfection and large-scale PCR of various human populations, we have shown that emergence and rapid expansion of miR-941 might take place on the human evolutionary linage between six and one million years ago. Functionally, miR-941 could be associated with hedgehog and insulin signaling pathways, and thus might potentially play a role in evolution of human longevity. Human-specific effects of miR-941 regulation are detectable in human brain and affect genes involved in neurotransmitter signaling. Furthermore, emergence of miR-941 on the human evolutionary linage was accompanied by the accelerated loss of its binding sites. Taken together, these results strongly implicate the contribution of miR-941 in evolution of the human-specific phenotype. Ago2 Immunoprecipitation (Ago2-IP) experiments after miR-941 overexpression were conducted in 293T cell line. Briefly, All transfections were performed using human 293T cells cultured in 6-well tissue culture plates. Lipofectamine 2000 (Invitrogen) was used for a Synthetic miR-941 or a scrambled oligo transfection, at 30 nmol/l each (final concentration) per 1x106 cells/well of a 6-well plate using DharmaFECT (GE Healthcare). Total 5x106 cells were collected and subjected to Ago2 immunoprecipitation (Ago2-IP) using the RNA isolation kit Mouse Ago2 (Wako Chemicals) according to the manufacturer's instructions. For a negative control, immunoprecipitation was performed using nonimmune IgG beads prepared with the antibody immobilization bead kit (Wako Chemicals). The IP pull down RNA was used as template for an “in vitro” transcription reaction generating biotin-labeled antisense cRNA. The cRNA was analyzed on affymetrix Human Genome U133 Plus 2.0 arrays following the manufacturer’s instructions. R RMA package was used to quantify gene expression levels.
2012-12-20 | E-GEOD-39227 | biostudies-arrayexpress
Project description:MYC regulates the expression of multiple microRNA (miRNA) genes and defines the Burkitt lymphoma (BL) miRNA signature. Here, we investigate the role of the MYC-regulated miRNAs by gain- and loss-of-function analysis. Overexpression of 5 miRNAs that were significantly downregulated by MYC resulted in strong (miR-150, miR-26a, miR-26b) and mild (miR-29a, let-7a) impaired cell growth. Overexpression of miR-155 increased proliferation of BL cells. By RNA immunoprecipitation of Argonaute 2 in BL cells with and without miR-155 we identified 54 miR-155 target genes. Using an shRNA approach we identified TBRG1 (NIAM1) as a miR-155 target gene that copied the miR-155-induced phenotype upon its inhibition. Analysis of TBRG1 protein expression and miR-155 levels in primary cases of B-cell lymphoma revealed that miR-155 levels are significantly lower in TBRG1 positive cases suggesting that TBRG1 is also regulated by miR-155 in primary B-cell lymphoma. Our data demonstrate that overexpression of individual MYC-repressed miRNAs has a strong suppressive effect on BL cell growth, whereas overexpression of miR-155 enhances B-cell lymphoma growth by targeting the tumor suppressor gene TBRG1. Gene expression profile was performed in ST486 Burkitt lymphoma cell line in 4 samples: ST486 EV (empty MXW-PGK-IRES-GFP vector) total cell lysate, ST486 EV Ago2-IP, ST486 miR-155 (ST486 with ectopic miR-155) total cell lysate, ST486 miR-155 Ago2-IP.
2015-02-20 | E-GEOD-64484 | biostudies-arrayexpress
Project description:Here we investigate the RNA-binding protein AGO2 in HeLa by using a combination of AGO2 enhanced individual nucleotide resolution UV crosslinking and immunoprecipitation (eiCLIP). We find that 5’ capped RNAs derived from 3’UTRs likely originate from AGO2-mediated cleavage, and most often occur at locations with potential to form G-quadruplexes.
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Project description:Here we investigate the RNA-binding protein AGO2 in HeLa by using a combination of AGO2 enhanced individual nucleotide resolution UV crosslinking and immunoprecipitation (eiCLIP). We find that 5’ capped RNAs derived from 3’UTRs likely originate from AGO2-mediated cleavage, and most often occur at locations with potential to form G-quadruplexes.
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