Abstract
The roles that noncoding RNAs play in various cells have been a focus of intense research in recent years. Circular RNAs (circRNAs) are noncoding RNAs that were initially thought to be junk by-products of splicing. Many circRNAs have been found to demonstrate important regulatory functions and, in particular, to act as miRNA sponges. The function of an miRNA sponge was compared with the function of a classic transcription factor (TF)-dependent regulatory loop in terms of efficiency, working rate, and noise characteristics. A circRNA with multiple binding sites for miRNA was found to act more efficiently than a TF and the respective loop worked faster, but only when the binding sites were not fully saturated with miRNA molecules. The noise characteristics of the circRNA loop were significantly worse with an increasing number of binding sites. A circRNA with one binding site was shown to be inefficient as an miRNA sponge. The circRNA-mediated regulation was assumed to provide a specific tool to the cell.
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ACKNOWLEDGMENTS
We are grateful to S.A. Rukolaine for advice.
Funding
M.A. Duk acknowledges the support from research program no. 0040-2019-0003 Nonlinear Processes and Mechanisms of Mass Transfer in Condensed Media and Biostructures of the Ioffe Physical Technical Institute (study of the circRNA role). M.G. Samsonova acknowledges support from the Ministry of Education and Science of the Russian Federation (contract no. 075-15-2020-934 Advanced Digital Technologies with the St. Petersburg Polytechnic University) (verification of the biological significance of the study).
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Translated by T. Tkacheva
Abbreviations: TF, transcription factor.
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Duk, M.A., Samsonova, M.G. The Pros and Cons of Circular RNAs as miRNA Sponges. BIOPHYSICS 66, 8–16 (2021). https://doi.org/10.1134/S0006350921010036
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DOI: https://doi.org/10.1134/S0006350921010036