Journal
MOLECULAR CELL
Volume 49, Issue 2, Pages 298-309Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2012.11.011
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Funding
- National Science Foundation [MCB 1120271]
- Austrian Science Fund (FWF) fellowship [J3199-B09]
- NIH National Research Service Award [5-T32-GM07544]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1120271] Funding Source: National Science Foundation
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RNA-mediated transcriptional silencing prevents deleterious effects of transposon activity and controls the expression of protein-coding genes. It involves long noncoding RNAs (lncRNAs). In Arabidopsis thaliana, some of those lncRNAs are produced by a specialized RNA Polymerase V (Pol V). The mechanism by which lncRNAs affect chromatin structure and mRNA production remains mostly unknown. Here we identify the SWI/SNF ATP-dependent nucleosome-remodeling complex as a component of the RNA-mediated transcriptional silencing pathway. We found that SWI3B, an essential subunit of the SWI/SNF complex, physically interacts with a lncRNA-binding protein, IDN2. SWI/SNF subunits contribute to lncRNA-mediated transcriptional silencing. Moreover, Pol V mediates stabilization of nucleosomes on silenced regions. We propose that Pol V-produced lncRNAs mediate transcriptional silencing by guiding the SWI/SNF complex and establishing positioned nucleosomes on specific genomic loci. We further propose that guiding ATP-dependent chromatin-remodeling complexes may be a more general function of lncRNAs.
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