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Plant Cell. 2019 Aug;31(8):1734-1750. doi: 10.1105/tpc.19.00069. Epub 2019 Jun 12.

Cell Cycle-Dependent Regulation and Function of ARGONAUTE1 in Plants.

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Institut de Biologie Moléculaire des Plantes (IBMP-CNRS), 12, Rue du Général Zimmer, 67084 Strasbourg Cedex, France.
Donald Danforth Plant Science Center, 975 N Warson Road, St. Louis, Missouri 63132.
Division of Plant Sciences, 52 Agriculture Lab, University of Missouri, Columbia, Missouri 65211.
Institut de Biologie Moléculaire des Plantes (IBMP-CNRS), 12, Rue du Général Zimmer, 67084 Strasbourg Cedex, France


Regulated gene expression is key to the orchestrated progression of the cell cycle. Many genes are expressed at specific points in the cell cycle, including important cell cycle regulators, plus factors involved in signal transduction, hormonal regulation, and metabolic control. We demonstrate that post-embryonic depletion of Arabidopsis (Arabidopsis thaliana) ARGONAUTE1 (AGO1), the main effector of plant microRNAs (miRNAs), impairs cell division in the root meristem. We utilized the highly synchronizable tobacco (Nicotiana tabacum) Bright yellow 2 (BY2) cell suspension to analyze mRNA, small RNAs, and mRNA cleavage products of synchronized BY2 cells at S, G2, M, and G1 phases of the cell cycle. This revealed that in plants, only a few miRNAs show differential accumulation during the cell cycle, and miRNA-target pairs were only identified for a small proportion of the more than 13,000 differentially expressed genes during the cell cycle. However, this unique set of miRNA-target pairs could be key to attenuate the expression of several transcription factors and disease resistance genes. We also demonstrate that AGO1 binds to a set of 19-nucleotide, tRNA-derived fragments during the cell cycle progression.

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