Journal
TRENDS IN PLANT SCIENCE
Volume 13, Issue 7, Pages 317-328Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2008.05.004
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In plants and several other organisms, the effects of RNA silencing can be amplified by the action of cellular RNA-DEPENDENT RNA POLYMERASES (RDRs). These enzymes were primarily studied for their role in antiviral defense in plants, but it is becoming increasingly apparent that they also have important endogenous functions, including the control of chromatin structure and the regulation of cellular gene expression. Recent evidence suggests that endogenous RDR activities intercept several RNA quality control pathways that normally prevent or restrain widespread amplification of silencing, which is likely to be detrimental. Plants appear, however, to have evolved sophisticated measures to tolerate or exploit amplified silencing under specific biological circumstances.
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