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Figueiredo, Joana; Santos, Tiago; Miranda, André; Alexandre, Daniela; Teixeira, Bernardo; Simões, Pedro; Lopes-Nunes, Jéssica; Cruz, Carla
Molecules (Basel, Switzerland), 10/2021, Volume: 26, Issue: 20Journal Article
The non-coding RNAs (ncRNA) are RNA transcripts with different sizes, structures and biological functions that do not encode functional proteins. RNA G-quadruplexes (rG4s) have been found in small and long ncRNAs. The existence of an equilibrium between rG4 and stem−loop structures in ncRNAs and its effect on biological processes remains unexplored. For example, deviation from the stem−loop leads to deregulated mature miRNA levels, demonstrating that miRNA biogenesis can be modulated by ions or small molecules. In light of this, we report several examples of rG4s in certain types of ncRNAs, and the implications of G4 stabilization using small molecules, also known as G4 ligands, in the regulation of gene expression, miRNA biogenesis, and miRNA−mRNA interactions. Until now, different G4 ligands scaffolds were synthesized for these targets. The regulatory role of the above-mentioned rG4s in ncRNAs can be used as novel therapeutic approaches for adjusting miRNA levels.
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