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Gene expression profile of hepatic lincRNAs in male mouse liver using nuclear RNA-Seq

ABSTRACT: Gene expression in adult male mouse liver was assayed by nuclear RNA-seq, as part of a study of hepatic lincRNAs.

ORGANISM(S): Mus musculus

PROVIDER: GSE66009 | GEO | 2015/10/21

SECONDARY ACCESSION(S): PRJNA275764

REPOSITORIES: GEO

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Project description:Numerous studies over the past decade have elucidated a substantial set of long intergenic noncoding RNAs (lincRNAs). It has since become clear that lincRNAs constitute an important layer of genome regulation across a wide spectrum of species. Yet, the factors governing their evolution and origins remain relatively unexplored. One possible factor that may have shaped lincRNA biology are transposable elements (TEs). Here we set out to comprehensively characterize the TE content of lincRNAs relative to genomic averages and protein coding transcripts. Our analysis of the TE composition across 9241 human lincRNAs revealed that, in sharp contrast to protein coding genes, a striking majority (83%) of lincRNAs contain a TE, and TEs comprise 42% of lincRNA transcript sequences. LincRNA TE composition varies significantly from genomic averages, being depleted of LI and Alu elements and enriched for a broad class of endogenous retroviruses (ERVs). Furthermore, specific TE families occur in biased positions and orientations within lincRNAs, particularly at their transcription start sites, suggesting a role in the origin of those lincRNAs. Finally, we find that TEs can drive gene expression regulation of lincRNAs—we observed a dramatic correlation between lincRNAs containing HERVH elements and almost exclusive expression in pluripotent cells. Conversely, those lincRNAs that are devoid of TEs are more highly expressed in testis. Collectively, TEs pervade lincRNAs and have shaped lincRNA evolution and function via bestowing tissue-specific expression from donated transcriptional regulatory signals. We extracted profiled the transcriptome expression polyadenylated mRNA-Seq. We then used these to reconstruct the transcriptome using de-novo assemblers and identify long non coding RNAs and their expression.

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lincRNAs act in the circuitry controlling pluripotency and differentiation

Project description:While thousands of large intergenic non-coding RNAs (lincRNAs) have been identified in mammals, few have been functionally characterized leading to debate about their biological role. To address this, we performed loss-of-function studies on most lincRNAs expressed in mouse embryonic stem cells (ESC) and characterized the effects on gene expression. Here we show that knockdown of lincRNAs have major consequences on gene expression patterns, comparable to knockdown of well-known ESC regulators. Notably, lincRNAs primarily affect gene expression in trans. We identify dozens of lincRNAs whose knockdown causes an exit from the pluripotent state or upregulation of lineage commitment programs. We integrate lincRNAs into the molecular circuitry of ESCs and show that lincRNA genes are regulated by key transcription factors and that lincRNA transcripts physically bind to multiple chromatin regulatory proteins to affect shared gene expression programs. Together, the results demonstrate that lincRNAs have key roles in the circuitry controlling ESC state. We generated five lentiviral-based shRNAs targeting each of the 237 lincRNAs previously identified in ESCs. These shRNAs successfully targeted 147 lincRNAs and reduced their expression by an average of ~75% compared to endogenous levels in ESCs. As positive controls, we generated shRNAs targeting ~50 genes encoding regulatory proteins, including both transcription factor and chromatin factor genes that have been shown to play critical roles in ESC regulation; we obtained validated hairpins against 40 of these genes. As negative controls, we performed independent infections with lentiviruses containing 27 different shRNAs with no known cellular target RNA.

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