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Arraystar m6A-mRNA&lncRNA Epitranscriptomic Microarray Service for 6 Mouse samples

ABSTRACT: Total RNA from each sample was quantified using the NanoDrop ND-1000 and RNA integrity was assessed by Bioanalyzer 2100 or Mops electrophoresis. The sample preparation and microarray hybridization were performed based on the Arraystar’s standard protocols. Briefly, the total RNAs were immunoprecipitated with anti-N6-methyladenosine (m6A) antibody. The modified RNAs were eluted from the immunoprecipitated magnetic beads as the “IP”. The unmodified RNAs were recovered from the supernatant as “Sup”. The “IP” and “Sup” RNAs were labeled with Cy5 and Cy3 respectively as cRNAs in separate reactions using Arraystar RNA Labeling protocol. The cRNAs were combined together and hybridized onto Arraystar Mouse mRNA&lncRNA Epitranscriptomic Microarray (8x60K, Arraystar). After washing the slides, the arrays were scanned in two-color channels by an Agilent Scanner G2505C.Agilent Feature Extraction software (version 11.0.1.1) was used to analyze acquired array images. Raw intensities of IP (immunoprecipitated, Cy5-labelled) and Sup (supernatant, Cy3-labelled) were normalized with average of log2-scaled Spike-in RNA intensities. After Spike-in normalization, the probe signals having Present (P) or Marginal (M) QC flags in a certain proportion were retained for further “m6A quantity” analyses. “m6A quantity” was calculated for the m6A methylation amount based on the IP (Cy5-labelled) normalized intensities. Differentially m6A-methylated RNAs between two comparison groups were identified by filtering with the fold change and statistical significance (p-value) thresholds. Hierarchical Clustering was performed to show the distinguishable m6A-methylation pattern among samples.

ORGANISM(S): Mus musculus

PROVIDER: GSE218412 | GEO | 2022/11/24

REPOSITORIES: GEO

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Project description:We recently showed that the mammalian genome encodes more than a thousand large intergenic non-coding RNAs (lincRNAs) that are clearly conserved across mammals and thus functional. Gene expression patterns have implicated these lincRNAs in diverse biological processes including cell cycle regulation, immune surveillance, and embryonic stem cell pluripotency. However, the mechanism by which these lincRNAs function is unknown. Here, we expand the catalog of human lincRNAs to ~3300 by analyzing chromatin-state maps of various human cell types. Inspired by the observation that the well-characterized lincRNA HOTAIR bind the Polycomb Repressive Complex 2 (PRC2), we tested whether many lincRNAs are physically associated with PRC2. Remarkably, we observe that ~20% of lincRNAs expressed in various cell types are bound by PRC2, and that additional lincRNAs are bound by other chromatin-modifying complexes. Moreover, we show that siRNA-mediated depletion of certain lincRNAs associated with PRC2 leads to changes in gene expression and that the upregulated genes are enriched for those normally silenced by PRC2. We propose a model in which some lincRNAs guide chromatin–modifying complexes to specific genomic loci to regulate gene expression. siRNA-mediated lincRNA knockdown siRNAs targeting specific lincRNAs were transected into human fibroblasts. Non-targeting siRNAs were used as controls. Both of these experiment types were hybridized to Affymetrix gene expression arrays. PRC2 RIP-Chip The PRC2 complex was immunoprecipitated using antibodies targetting Suz12 and the associated RNA was hybridized to Nimblegen tiling arrays representing lincRNAs. In parallel an IgG IP was performed and hybridized to the same NG arrays. RIP was performed for PRC2 and hybridized using a Cy3 label. In parallel, RIP was performed using IGG and labelled with Cy5 PRC2 RIP-Chip (dye swap) The PRC2 complex was immunoprecipitated using antibodies targetting Suz12 and the associated RNA was hybridized to Nimblegen tiling arrays representing lincRNAs. In parallel an IgG IP was performed and hybridized to the same NG arrays. RIP was performed for PRC2 and hybridized using a Cy5 label. In parallel, RIP was performed using IGG and labelled with Cy3 PRC2 RIP-Chip (no proteins) The PRC2 complex was immunoprecipitated using antibodies targetting Suz12 and the associated RNA was hybridized to Nimblegen tiling arrays representing lincRNAs. In parallel an IgG IP was performed and hybridized to the same NG arrays. RIP was performed for PRC2 and hybridized using a Cy3 label. In parallel, RIP was performed using IGG and labelled with Cy5 COREST RIP-Chip The COREST complex was immunoprecipitated using antibodies targetting COREST and the associated RNA was hybridized to Nimblegen tiling arrays representing lincRNAs. In parallel an IgG IP was performed and hybridized to the same NG arrays. RIP was performed for COREST and hybridized using a Cy3 label. In parallel, RIP was performed using IGG and labelled with Cy5 H3K27me3 and H3K4me2 modified histones RIP-Chip The H3K27me3 and H3K4me2 modified histones were immunoprecipitated using antibodies targetting COREST and the associated RNA was hybridized to Nimbelgen tiling arrays representing lincRNAs. In parallel an IgG IP was performed and hybridized to the same NG arrays. RIP was performed for COREST and hybridized using a Cy3 label. In parallel, RIP was performed using IGG and labelled with Cy5 Human lincRNA expression Human lincRNAs were profiled in HeLa, Lung FB, and Foot FB. In addition, nuclear and cytoplasmic fractions were taken in HeLa cells Total RNA was extracted from HeLa, Foot, and Lung cells and hybridized to NG tiling array. In addition, the nucleus was fractionated and RNA was hybridized to an array.

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Arraystar m6A-mRNA&lncRNA Epitranscriptomic Microarray Service for 6 Mouse samples

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