FEBS Letters
Volume 583, Issue 6 , Pages 1039-1044, 18 March 2009

Diurnal oscillation in the accumulation of Arabidopsis microRNAs, miR167, miR168, miR171 and miR398

Edited by Shou-Wei Ding

Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB, Department of Molecular Genetics, Institut of Molecular Biology of Barcelona, CSIC, Jordi Girona 18, 08034 Barcelona, Spain

Received 28 December 2008; accepted 15 February 2009. published online 24 February 2009.

Abstract 

MicroRNAs (miRNAs) are small RNAs acting as regulators of eukaryotic gene expression at the post-transcriptional level. Plant miRNAs have been implicated in developmental processes and adaptation to the environment. We show that the accumulation of four Arabidopsis miRNAs (miR171, miR398, miR168 and miR167) oscillates during the diurnal cycle, their accumulation increasing during the light period of the daytime and decreasing in darkness. This oscillatory pattern of miRNA accumulation is not governed by the circadian clock. These results suggest a potential role of light in controlling miRNA accumulation while defining a new level of regulation of miRNA gene expression in Arabidopsis.

Keywords: Argonaute, Auxin response factor, Scarecrow, Superoxide dismutase

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PII: S0014-5793(09)00135-5

doi:10.1016/j.febslet.2009.02.024

FEBS Letters
Volume 583, Issue 6 , Pages 1039-1044, 18 March 2009

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