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• W1989870504 endingPage "e113848" @default.
• W1989870504 startingPage "e113848" @default.
• W1989870504 abstract "The generally accepted model of the miRNA-guided RNA down-regulation suggests that mature miRNA targets mRNA in a nucleotide sequence-specific manner. However, we have shown that the nucleotide sequence of miRNA is not the only determinant of miRNA specificity. Using specific nucleases, T1, V1 and S1 as well as NMR, UV/Vis and CD spectroscopies, we found that miR-21, miR-93 and miR-296 can adopt hairpin and/or homoduplex structures. The secondary structure of those miRNAs in solution is a function of RNA concentration and ionic conditions. Additionally, we have shown that a formation of miRNA hairpin is facilitated by cellular environment.Looking for functional consequences of this observation, we have perceived that structure of these miRNAs resemble RNA aptamers, short oligonucleotides forming a stable 3D structures with a high affinity and specificity for their targets. We compared structures of anti-tenascin C (anti-Tn-C) aptamers, which inhibit brain tumor glioblastoma multiforme (GBM, WHO IV) and selected miRNA. A strong overexpression of miR-21, miR-93 as well Tn-C in GBM may imply some connections between them. The structural similarity of these miRNA hairpins and anti-Tn-C aptamers indicates that miRNAs may function also beyond RISC and are even more sophisticated regulators, that it was previously expected. We think that the knowledge of the miRNA structure may give a new insight into miRNA-dependent gene regulation mechanism and be a step forward in the understanding their function and involvement in cancerogenesis. This may improve design process of anti-miRNA therapeutics." @default.
• W1989870504 created "2016-06-24" @default.
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• W1989870504 date "2014-11-25" @default.
• W1989870504 modified "2023-10-16" @default.
• W1989870504 title "Mature MiRNAs Form Secondary Structure, which Suggests Their Function beyond RISC" @default.
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• W1989870504 doi "https://doi.org/10.1371/journal.pone.0113848" @default.
• W1989870504 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4244182" @default.
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• W1989870504 hasPublicationYear "2014" @default.
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