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Author(s): Clark, Tyson A and Hon, Ting and Tseng, Elizabeth

In higher eukaryotic organisms, the majority of multi-exon genes are alternatively spliced. Different mRNA isoforms from the same gene can produce proteins that have distinct properties such as structure, function, or subcellular localization. Thus, the importance of understanding the full complement of transcript isoforms with potential phenotypic impact cannot be underscored. While microarrays and other NGS-based methods have become useful for studying transcriptomes, these technologies yield short, fragmented transcripts that remain a challenge for accurate, complete reconstruction of splice variants. The Iso-Seq protocol developed at PacBio offers the only solution for direct sequencing of full-length, single-molecule cDNA sequences to survey transcriptome isoform diversity useful for gene discovery and annotation. Knowledge of the complete isoform repertoire is also key for accurate quantification of isoform abundance. As most transcripts range from 1 – 10 kb, fully intact RNA molecules can be sequenced using SMRT Sequencing (avg. read length: 10-15 kb) without requiring fragmentation or post-sequencing assembly. Our open-source computational pipeline delivers high-quality, non-redundant sequences for unambiguous identification of alternative splicing events, alternative transcriptional start sites, polyA tail, and gene fusion events. The standard Iso-Seq protocol workflow available for all researchers is presented using a deep dataset of full- length cDNA sequences from the MCF-7 cancer cell line, and multiple tissues (brain, heart, and liver). Detected novel transcripts approaching 10 kb and alternative splicing events are highlighted. Even in extensively profiled samples, the method uncovered large numbers of novel alternatively spliced isoforms and previously unannotated genes.

Organization: PacBio
Year: 2015

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