Chromatin-associated RNA interference components contribute to transcriptional regulation in Drosophila

Filippo M. Cernilogar, Maria Cristina Onorati, Greg O. Kothe, A. Maxwell Burroughs, Krishna Mohan Parsi, Achim Breiling, Federica Lo Sardo, Alka Saxena, Keita Miyoshi, Haruhiko Siomi, Mikiko C. Siomi, Piero Carninci, David S. Gilmour, Davide F V Corona, Valerio Orlando

研究成果: Article

145 引用 (Scopus)

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RNA interference (RNAi) pathways have evolved as important modulators of gene expression that operate in the cytoplasm by degrading RNA target molecules through the activity of short (21-30 nucleotide) RNAs. RNAi components have been reported to have a role in the nucleus, as they are involved in epigenetic regulation and heterochromatin formation. However, although RNAi-mediated post-transcriptional gene silencing is well documented, the mechanisms of RNAi-mediated transcriptional gene silencing and, in particular, the role of RNAi components in chromatin dynamics, especially in animal multicellular organisms, are elusive. Here we show that the key RNAi components Dicer 2 (DCR2) and Argonaute 2 (AGO2) associate with chromatin (with a strong preference for euchromatic, transcriptionally active, loci) and interact with the core transcription machinery. Notably, loss of function of DCR2 or AGO2 showed that transcriptional defects are accompanied by the perturbation of RNA polymerase II positioning on promoters. Furthermore, after heat shock, both Dcr2 and Ago2 null mutations, as well as missense mutations that compromise the RNAi activity, impaired the global dynamics of RNA polymerase II. Finally, the deep sequencing of the AGO2-associated small RNAs (AGO2 RIP-seq) revealed that AGO2 is strongly enriched in small RNAs that encompass the promoter regions and other regions of heat-shock and other genetic loci on both the sense and antisense DNA strands, but with a strong bias for the antisense strand, particularly after heat shock. Taken together, our results show that DCR2 and AGO2 are globally associated with transcriptionally active loci and may have a pivotal role in shaping the transcriptome by controlling the processivity of RNA polymerase II.

元の言語English
ページ(範囲)391-395
ページ数5
ジャーナルNature
480
発行部数7377
DOI
出版物ステータスPublished - 2011 12 15

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ASJC Scopus subject areas

  • General

これを引用

Cernilogar, F. M., Onorati, M. C., Kothe, G. O., Burroughs, A. M., Parsi, K. M., Breiling, A., Sardo, F. L., Saxena, A., Miyoshi, K., Siomi, H., Siomi, M. C., Carninci, P., Gilmour, D. S., Corona, D. F. V., & Orlando, V. (2011). Chromatin-associated RNA interference components contribute to transcriptional regulation in Drosophila. Nature, 480(7377), 391-395. https://doi.org/10.1038/nature10492