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Widespread Translational Inhibition by Plant miRNAs and siRNAs
Peter Brodersen,1Lali Sakvarelidze-Achard,1Marianne Bruun-Rasmussen,1Patrice Dunoyer,1Yoshiharu Y. Yamamoto,2Leslie Sieburth,3Olivier Voinnet1*
High complementarity between plant microRNAs (miRNAs) and theirmessenger RNA targets is thought to cause silencing, prevalentlyby endonucleolytic cleavage. We have isolated Arabidopsis mutantsdefective in miRNA action. Their analysis provides evidencethat plant miRNA–guided silencing has a widespread translationalinhibitory component that is genetically separable from endonucleolyticcleavage. We further show that the same is true of silencingmediated by small interfering RNA (siRNA) populations. Translationalrepression is effected in part by the ARGONAUTE proteins AGO1and AGO10. It also requires the activity of the microtubule-severingenzyme katanin, implicating cytoskeleton dynamics in miRNA action,as recently suggested from animal studies. Also as in animals,the decapping component VARICOSE (VCS)/Ge-1 is required fortranslational repression by miRNAs, which suggests that theunderlying mechanisms in the two kingdoms are related.
1 Institut de Biologie Moléculaire des Plantes du CNRS, Unité Propre de Recherche 2357, 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France. 2 Center for Gene Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya Aichi, 464-8602, Japan. 3 Department of Biology, University of Utah, Salt Lake City, UT84112, USA.
* To whom correspondence should be addressed. E-mail: olivier.voinnet{at}ibmp-ulp.u-strasbg.fr
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