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Transcriptional silencing and promoter methylation triggered by double‐stranded RNA

Transcriptional silencing and promoter methylation triggered by double‐stranded RNA Double‐stranded RNA induces a post‐transcriptional gene silencing process, termed RNAi, in diverse organisms. It is shown here that transcriptional gene silencing accompanied by de novo methylation of a target promoter in plants can be triggered by a double‐stranded RNA containing promoter sequences. Similar to the double‐stranded RNA involved in RNAi, this promoter double‐stranded RNA, which is synthesized in the nucleus, is partially cleaved into small RNAs ∼23 nucleotides in length. Both transcriptional and post‐transcriptional gene silencing can thus be initiated by double‐stranded RNAs that enter the same degradation pathway. The results also implicate double‐stranded RNA in directing DNA methylation. Different constructs designed to produce double‐stranded promoter RNA in various ways were evaluated for their ability to induce gene silencing in tobacco and Arabidopsis. RNA hairpins transcribed from inverted DNA repeats were the most effective trans‐acting silencing signals. This strategy could be useful for transcriptionally downregulating genes in a variety of plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The EMBO Journal Wiley

Transcriptional silencing and promoter methylation triggered by double‐stranded RNA

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References (41)

Publisher
Wiley
Copyright
Copyright © 2013 Wiley Periodicals, Inc
ISSN
0261-4189
eISSN
1460-2075
DOI
10.1093/emboj/19.19.5194
pmid
11013221
Publisher site
See Article on Publisher Site

Abstract

Double‐stranded RNA induces a post‐transcriptional gene silencing process, termed RNAi, in diverse organisms. It is shown here that transcriptional gene silencing accompanied by de novo methylation of a target promoter in plants can be triggered by a double‐stranded RNA containing promoter sequences. Similar to the double‐stranded RNA involved in RNAi, this promoter double‐stranded RNA, which is synthesized in the nucleus, is partially cleaved into small RNAs ∼23 nucleotides in length. Both transcriptional and post‐transcriptional gene silencing can thus be initiated by double‐stranded RNAs that enter the same degradation pathway. The results also implicate double‐stranded RNA in directing DNA methylation. Different constructs designed to produce double‐stranded promoter RNA in various ways were evaluated for their ability to induce gene silencing in tobacco and Arabidopsis. RNA hairpins transcribed from inverted DNA repeats were the most effective trans‐acting silencing signals. This strategy could be useful for transcriptionally downregulating genes in a variety of plants.

Journal

The EMBO JournalWiley

Published: Feb 2, 2000

Keywords: ; ; ; ;

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