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• W2040803359 abstract "Proceedings: AACR 103rd Annual Meeting 2012‐‐ Mar 31‐Apr 4, 2012; Chicago, ILInitial transcriptomic studies largely relied on hybridization-based microarray technologies and offered a limited ability to fully catalogue and quantify the diverse RNA molecules that are expressed from genomes over wide ranges of levels. Massively parallel cDNA sequencing, or Total RNA-Seq, has allowed many advances in the characterization and quantification of transcriptomes; an offer a new appreciation for the complexity of the Transcriptome, encompassing a multitude of previously unknown coding and non-coding RNA species, particularly small RNAs, including micro RNAs. This work investigates the performance of different strategies for Total RNA-Seq using multiple next generation sequencing platforms. Standard RNA-sequencing approaches generally require double-stranded cDNA Synthesis, which erases RNA strand information. Synthesis of a randomly primed double-stranded cDNA followed by addition of adaptors for next-generation sequencing leads to the loss of information about which strand was present in the original mRNA template. The polarity of the transcript is important for correct annotation of novel genes, identification of antisense transcripts with potential regulatory roles, and for correct determination of gene expression levels in the presence of antisense transcripts. Here, we examine the performance of strand-specific RNA libraries made by direct ligation of adaptor on to the RNA. We analyze the effect of different RNA fragmentation methods (divalent cations plus heat versus enzymatic fragmentation) and we provide a comparative data analysis (library complexity, continuity of gene coverage, strand specificity and 3′and 5′-end bias analysis). Identification and analysis of small RNA by deep sequencing requires preparation of a di-tagged cDNA library, which leads to adaptor-dimer formation that strongly contaminates the library. We have developed a novel method to generate di-tagged small RNA libraries free of adapter-dimer contamination without introducing any additional enzymatic steps or gel purifications. This method has optimized the 3′adaptor-ligation reaction to recover and to increase representation of the 2′-O-modified RNAs present in a biological sample. To reduce cost and increase sample throughput we have developed a barcode strategy to tag samples during library construction. The multiplexed libraries can then be pooled together before size selection, reducing the number of steps in the workflow. This technique reduces bias by ligation, increases representation of modified small RNAs and simplifies workflow during library construction for small RNA analysis and discovery.Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 3186. doi:1538-7445.AM2012-3186" @default.
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• W2040803359 date "2012-04-15" @default.
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• W2040803359 title "Abstract 3186: Comparative analysis of different total RNA sequencing approaches" @default.
• W2040803359 doi "https://doi.org/10.1158/1538-7445.am2012-3186" @default.
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