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Int. J. Mol. Sci. 2013, 14(6), 11171-11189; doi:10.3390/ijms140611171

Fluctuation of Global Gene Expression by Endogenous miRNA Response to the Introduction of an Exogenous miRNA

Department of Computational Biology, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba-ken 277-8561, Japan
Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 21 March 2013 / Revised: 15 April 2013 / Accepted: 6 May 2013 / Published: 27 May 2013
(This article belongs to the Special Issue Regulation by non-coding RNAs 2013)
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Most of the intracellular endogenous microRNAs (endo-miRNAs) are considered to be saturated in Argonaute (Ago) proteins in the RNA-induced silencing complexes (RISCs). When exogenous miRNAs (exo-miRNAs) are introduced into cells, endo-miRNAs in the RISC may be replaced with exo-miRNAs or exo-miRNAs, and endo-miRNAs might also compete for the position in the newly synthesized RISC with each other. This would lead to the fluctuation of global gene expression not only by repression of exo-miRNA target gene expression, but also by the increase of the endo-miRNA target gene expression. In the present study, we quantified the changes in the expression levels of target genes of exo-miRNA and endo-miRNA in the cells transfected with fifteen different exo-miRNAs by microarray experiments. Different exo-miRNAs increased ratios of expression levels of target genes of a given endo-miRNA to different extents, suggesting that the replacement efficiencies might differ according to the exo-miRNA types. However, the increased ratios in the expression levels of each endo-miRNA target genes by the transfection of any particular exo-miRNA were mostly equivalent, suggesting that the endo-miRNAs present in the RISC might be replaced with excessive exo-miRNAs at similar levels, probably because they exist in single-stranded forms in the RISC. View Full-Text
Keywords: exogenous microRNA; endogenous microRNA; microarray; seed-matched target exogenous microRNA; endogenous microRNA; microarray; seed-matched target

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Nagata, Y.; Shimizu, E.; Hibio, N.; Ui-Tei, K. Fluctuation of Global Gene Expression by Endogenous miRNA Response to the Introduction of an Exogenous miRNA. Int. J. Mol. Sci. 2013, 14, 11171-11189.

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