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First published online March 10, 2006; 10.1105/tpc.105.039834

The Plant Cell 18:1121-1133 (2006)
© 2006 American Society of Plant Biologists

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Highly Specific Gene Silencing by Artificial MicroRNAs in Arabidopsis[W],[OA]

Rebecca Schwab, Stephan Ossowski, Markus Riester, Norman Warthmann and Detlef Weigel1

Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany

1 To whom correspondence should be addressed. E-mail weigel{at}weigelworld.org; fax 49-7071-601-1412.

Plant microRNAs (miRNAs) affect only a small number of targets with high sequence complementarity, while animal miRNAs usually have hundreds of targets with limited complementarity. We used artificial miRNAs (amiRNAs) to determine whether the narrow action spectrum of natural plant miRNAs reflects only intrinsic properties of the plant miRNA machinery or whether it is also due to past selection against natural miRNAs with broader specificity. amiRNAs were designed to target individual genes or groups of endogenous genes. Like natural miRNAs, they had varying numbers of target mismatches. Previously determined parameters of target selection for natural miRNAs could accurately predict direct targets of amiRNAs. The specificity of amiRNAs, as deduced from genome-wide expression profiling, was as high as that of natural plant miRNAs, supporting the notion that extensive base pairing with targets is required for plant miRNA function. amiRNAs make an effective tool for specific gene silencing in plants, especially when several related, but not identical, target genes need to be downregulated. We demonstrate that amiRNAs are also active when expressed under tissue-specific or inducible promoters, with limited nonautonomous effects. The design principles for amiRNAs have been generalized and integrated into a Web-based tool (http://wmd.weigelworld.org).




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