Many human large intergenic noncoding RNAs associate with chromatin-modifying complexes and affect gene expression
Ahmad M. Khalil,Mitchell Guttman,Maite Huarte,Manuel Garber,Arjun Raj,Dianali Rivea Morales,Kelly Thomas,Aviva Presser,Bradley E. Bernstein,Alexander van Oudenaarden,Aviv Regev,Eric S. Lander,John L. Rinn +12 more
TLDR
A model in which some lincRNAs guide chromatin-modifying complexes to specific genomic loci to regulate gene expression is proposed, and it is shown that siRNA-mediated depletion of certain linc RNAs associated with PRC2 leads to changes in gene expression.Abstract:
We recently showed that the mammalian genome encodes >1,000 large intergenic noncoding (linc)RNAs 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 ≈3,300 by analyzing chromatin-state maps of various human cell types. Inspired by the observation that the well-characterized lincRNA HOTAIR binds the polycomb repressive complex (PRC)2, 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. Also, we show that siRNA-mediated depletion of certain lincRNAs associated with PRC2 leads to changes in gene expression, and that the up-regulated 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.read more
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A ceRNA Hypothesis: The Rosetta Stone of a Hidden RNA Language?
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