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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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HITS-CLIP reveals key regulators of nuclear receptor signaling in breast cancer.

ABSTRACT: We used a genome-wide approach (High-throughput sequencing of RNA isolated by crosslinking immunoprecipitation, or HITS-CLIP) to define direct miRNA-mRNA interactions in three breast cancer subtypes (estrogen receptor positive, Her2 amplified and triple negative). Focusing on steroid receptor signaling, we identified two novel regulators of the ER pathway (miR-9-5p and miR-193a/b-3p), which together target multiple genes involved in ER signaling. Moreover, this approach enabled the definition of miR-9-5p as a global regulator of steroid receptor signaling in breast cancer. Finally, we show that miRNA targets and networks defined by our analysis are predictive of patient outcomes and provide global insight into miRNA regulation in breast cancer. Argonaute HITS-CLIP on three representative breast cancer cell lines (each in triplicate).

ORGANISM(S): Homo sapiens

SUBMITTER: Peter Kabos

PROVIDER: E-GEOD-57855 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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HITS-CLIP reveals key regulators of nuclear receptor signaling in breast cancer.

Pillai Manoj M MM Gillen Austin E AE Yamamoto Tomomi M TM Kline Enos E Brown Joseph J Flory Kale K Hesselberth Jay R JR Kabos Peter P

Breast cancer research and treatment 20140607 1

miRNAs regulate the expression of genes in both normal physiology and disease. While miRNAs have been demonstrated to play a pivotal role in aspects of cancer biology, these reports have generally focused on the regulation of single genes. Such single-gene approaches have significant limitations, relying on miRNA expression levels and heuristic predictions of mRNA-binding sites. This results in only circumstantial evidence of miRNA-target interaction and typically leads to large numbers of false ...[more]

PMID: 24906430

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Improvements to the HITS-CLIP protocol eliminate widespread mispriming artifacts.

Project description:High-throughput sequencing of RNA isolated by crosslinking immunoprecipitation (HITS-CLIP) allows for high resolution, genome-wide mapping of RNA-binding proteins. We found that substantial mispriming during reverse transcription results in the overrepresentation of sequences complementary to the primer used for reverse transcription. Up to 45% of peaks in publicly available HITS-CLIP libraries are attributable to this artifact, and the majority of libraries have detectable levels of mispriming. We also found that standard techniques for validating miRNA-target interactions fail to differentiate between artifactual peaks and physiologically relevant peaks. Here, we present a modification to the HITS-CLIP protocol that effectively eliminates this artifact. Argonaute HITS-CLIP on the MCF-7 breast cancer cell line treated with 17Î²-estradiol for 0, 6 or 24 hours using a nested reverse transcriptions pimer and protected or unprotected reverse PCR primers for library amplification.

2016-02-19 | E-GEOD-78059 | biostudies-arrayexpress

HITS-CLIP reveals key regulators of nuclear receptor signaling in breast cancer.

Project description:We used a genome-wide approach (High-throughput sequencing of RNA isolated by crosslinking immunoprecipitation, or HITS-CLIP) to define direct miRNA-mRNA interactions in three breast cancer subtypes (estrogen receptor positive, Her2 amplified and triple negative). Focusing on steroid receptor signaling, we identified two novel regulators of the ER pathway (miR-9-5p and miR-193a/b-3p), which together target multiple genes involved in ER signaling. Moreover, this approach enabled the definition of miR-9-5p as a global regulator of steroid receptor signaling in breast cancer. Finally, we show that miRNA targets and networks defined by our analysis are predictive of patient outcomes and provide global insight into miRNA regulation in breast cancer.

2014-08-04 | GSE57855 | GEO

Transcriptome-wide miR-155 binding map reveals widespread non-canonical microRNA targeting [CLIP-seq data]

Project description:microRNAs (miRNAs) are essential components of gene regulation, but identification of miRNA targets remains a major challenge. Most target prediction and discovery relies on perfect complementarity of the miRNA seed to the 3’ untranslated region (UTR). However, it is unclear to what extent miRNAs target sites without seed matches. Here, we performed a transcriptome-wide identification of the endogenous targets of a single miRNA—miR-155—in a genetically controlled manner. We found that approximately forty percent of miR-155-dependent Argonaute binding occurs at sites without perfect seed matches. The majority of these non-canonical sites feature extensive complementarity to the miRNA seed with one mismatch. These non-canonical sites confer regulation of gene expression albeit less potently than canonical sites. Thus, non-canonical miRNA binding sites are widespread, often contain seed-like motifs, and can regulate gene expression, generating a continuum of targeting and regulation. Argonaute (AGO) HITS-CLIP Libraries generated from wild type and miR-155 knockout activated T cells. AGO HITS-CLIP libraries were generated from activated wild type and miR-155 knockout T cells with two different 3' linkers. Libraries were generated and sequenced with an 11nt index read that contained both a 5nt multiplexing index and a 6nt degenerate barcode. Files have been demultiplexed and the 6nt degenerate barcode has been appended as the first 6 nucleotides of the read.

2012-11-09 | E-GEOD-41285 | biostudies-arrayexpress

Five microRNAs in serum are able to differentiate breast cancer patients from healthy individuals

Project description:Breast Cancer is the cancer with most incidence and mortality in women. microRNAs are emerging as novel prognosis/diagnostic tools. Our aim was to identify a serum microRNA signature useful to predict cancer development. We focused on studying the expression levels of 30 microRNAs in the serum of 96 breast cancer patients versus 92 control individuals. Bioinformatic studies provide a microRNA signature, designated as a predictor, based upon the expression levels of 5 microRNAs. Then, we tested the predictor in a group of 60 randomly chosen women. Lastly, a proteomic study unveiled the over-expression and down-regulation of proteins differently expressed in the serum of breast cancer patients versus that of control individuals. Twenty-six microRNAs differentiate cancer tissue from healthy tissue and 16 microRNAs differentiate the serum of cancer patients from that of the control group. The tissue expression of miR-99a-5p, mir-497-5p, miR-362, and miR-1274, and the serum levels of miR-141 correlated with patient survival. Moreover, the predictor consisting of mir-125b-5p, miR-29c-3p, mir-16-5p, miR-1260, and miR-451a was able to differentiate breast cancer patients from controls. The predictor was validated in 20 new cases of breast cancer patients and tested in 60 volunteer women, assigning 11 out of 60 women to the cancer group. An association of low levels of mir-16-5p with a high content of CD44 protein in serum was found. Circulating microRNAs in serum can represent biomarkers for cancer prediction. Their clinical relevance and use of the predictor here described might be of potential importance for breast cancer prediction.

2020-09-18 | PXD020795 | Pride

Differential HITS-CLIP of miRNA binding sites in miR-29 deficient CD4 T cells.

Project description:Differential HITS-CLIP of miRNA binding sites in miR-29 deficient CD4 T cells.

2019-08-12 | GSE130655 | GEO

Flag-RBM47 HITS-CLIP in brain metastatic derivatives of MDA-MB-231

Project description:Brain metastatic breast cancer cells were subjected to HITS-CLIP to identify the targets of the RNA binding protein RBM47 MDA231-BrM2a is characterized in PMID: 19421193; Related data published together with these data are found in GSE53779 Non-clonal brain metastatic breast cancer cells stably expressing Flag-tagged, wild-type RBM47 under a doxycline-inducible promoter were treated for three days with doxycycline then UV-irradiated and subjected to Flag HITS-CLIP

2014-06-11 | E-GEOD-58380 | biostudies-arrayexpress

Elucidation of Transcriptome-Wide MicroRNA Binding Sites in Human Cardiac Tissues by Ago2 HITS-CLIP

Project description:We deciphered Ago2:RNA interactions in post-mortem human heart tissues using crosslinking immunoprecipitation coupled with high-throughput sequencing (HITS-CLIP) to generate the first transcriptome-wide map of miR targeting events in human myocardium, detecting 4000 cardiac Ago2 binding sites across >2200 target transcripts. Profiling AGO2-associated RNAs in cardiac tissues obtained from 6 donors with heart diseases of differing etiologies

2016-08-09 | E-GEOD-83410 | biostudies-arrayexpress

MiR-CLIP capture of a miRNA targetome uncovers a lincRNA H19-miR-106a interaction [IV]

Project description:Identifying the interaction partners of non-coding RNAs is essential for elucidating their functions. We have developed an approach, termed microRNA-cross-linking and immunoprecipitation (miR-CLIP), using pre-miRNAs modified with psoralen and biotin to capture their targets in cells. Photo-cross-linking and Argonaute 2-immunopurification followed by streptavidin affinity-purification of probe-linked RNAs provided selectivity in the capture of targets, identified by deep-sequencing. MiR-CLIP with pre-miR-106a, a miR-17-5p family member, identified hundreds of putative targets in HeLa cells, many carrying conserved sequences complementary to the miRNA seed but also many that were not predicted computationally. MiR-106a overexpression experiments confirmed that miR-CLIP captured functional targets, including H19, a long-non-coding RNA that is expressed during skeletal muscle cell differentiation. We showed that miR-17-5p family members bind H19 in HeLa cells and myoblasts. During myoblast differentiation levels of H19, miR-17-5p family members and mRNA targets changed in a manner suggesting that H19 acts as a sponge for these miRNAs. Two replicates of two cDNA libraries were submitted to deep sequencing: a sample from siH19-transfected cells and a control sample.

2014-12-22 | E-GEOD-62679 | biostudies-arrayexpress

miR-671-5p promotes epithelial-to-mesenchymal transition by downregulating FOXM1 expression in breast cancer

Project description:microRNA (miRNA) dysfunction is associated with a variety of human diseases including cancer. Our previous study showed that miR-671-5p was deregulated during breast cancer progression. We aim to decipher the functional mechanism of miR- 671-5p in breast cancer. We used microarrays to detail the global programme of gene expression after overexpression miR-671-5p in several breast cancer cell lines, and those altered genes might potentially under regulation of miR-671-5p contibuting to breast cancer developemtn. miR-671-5p or scramble control nucleotide were tranfected into breast cancer cell lines, including MCF7, MDA231 and SKBR3. Total RNA were extracted and hybridized on Affymetrix microarrays. We sought to identify the potential downstream target genes that under miR-671-5p regulation by overexpress miR-671-5p. Potential targets were predicted to see if it has binding sites matching miR-671-5p sequence by miRNA target prediction softwares.

2014-10-16 | E-GEOD-62411 | biostudies-arrayexpress

Transcriptome-wide discovery of microRNA binding sites in human brain by Ago2 HITS-CLIP [Ago2-miRNA-target mRNA complexes]

Project description:Here, seeking to gain insight into the array of transcripts engaged with miRNAs in human brain, we performed HITS-CLIP to profile transcriptome-wide Ago2:RNA interactions in a panel of eleven post-mortem adult human brain samples harvested from adult motor cortex and cingulate gyrus, regions associated with movement and psychiatric disorders . High-throughput sequencing of RNA isolated by crosslinking immunoprecipitation (HITS-CLIP) Eleven post-mortem adult human brain tissues were subjected to ultraviolet radiation to crosslink proteins with nucleic acids, and HITS-CLIP was performed as previously described by Chi et al Nature. 2009 Jul 23;460(7254):479-86 using an anti-Ago2 polyclonal antibody and some additional modifications.

2014-01-03 | E-GEOD-52082 | biostudies-arrayexpress

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