| Autor: |
Nakama, Mina, Kawakami, Kei, Kajitani, Takuya, Urano, Takeshi, Murakami, Yota |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
Genes to Cells. 17(3):218-233 |
| ISSN: |
1356-9597 |
| Popis: |
Certain non-coding RNAs (ncRNAs) implicated in the regulation of chromatin structure associate with chromatin. During the formation of RNAi-directed heterochromatin in fission yeast, ncRNAs transcribed from heterochromatin are thought to recruit the RNAi machinery to chromatin for the formation of heterochromatin; however, the molecular details of this association are not clear. Here, using RNA-immunoprecipitation assay, we showed that the heterochromatic ncRNA associated with chromatin via the formation of a DNA:RNA hybrid and bound to the RNA-induced transcriptional silencing (RITS) complex. The presence of DNA:RNA hybrid in the cell was also confirmed by immunofluorescence analysis using anti-DNA:RNA hybrid antibody. Overexpression and depletion of RNase H in vivo decreased and increased the amount of DNA:RNA hybrid formed, respectively, and both disturbed heterochromatin. Moreover, DNA:RNA hybrid was formed on, and overexpression of RNase H inhibited the formation of, artificial heterochromatin induced by tethering of RITS to mRNA. These results indicate that heterochromatic ncRNAs are retained on chromatin via the formation of DNA:RNA hybrids and provide a platform for the RNAi-directed heterochromatin assembly and suggest that DNA:RNA hybrid formation plays a role in chromatic ncRNA function. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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