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pubmed-article:15851028pubmed:abstractTextPlants and animals use small RNAs (microRNAs [miRNAs] and siRNAs) as guides for posttranscriptional and epigenetic regulation. In plants, miRNAs and trans-acting (ta) siRNAs form through distinct biogenesis pathways, although they both interact with target transcripts and guide cleavage. An integrated approach to identify targets of Arabidopsis thaliana miRNAs and ta-siRNAs revealed several new classes of small RNA-regulated genes, including conventional genes such as Argonaute2 and an E2-ubiquitin conjugating enzyme. Surprisingly, five ta-siRNA-generating transcripts were identified as targets of miR173 or miR390. Rather than functioning as negative regulators, miR173- and miR390-guided cleavage was shown to set the 21-nucleotide phase for ta-siRNA precursor processing. These data support a model in which miRNA-guided formation of a 5' or 3' terminus within pre-ta-siRNA transcripts, followed by RDR6-dependent formation of dsRNA and Dicer-like processing, yields phased ta-siRNAs that negatively regulate other genes.lld:pubmed
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pubmed-article:15851028pubmed:pagination207-21lld:pubmed
pubmed-article:15851028pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:15851028pubmed:articleTitlemicroRNA-directed phasing during trans-acting siRNA biogenesis in plants.lld:pubmed
pubmed-article:15851028pubmed:affiliationCenter for Gene Research and Biotechnology, Oregon State University, Corvallis, Oregon 97331, USA.lld:pubmed
pubmed-article:15851028pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15851028pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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