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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
3' UTR G-quadruplexes regulate miRNA binding.
RNA 2017 August
MicroRNAs (miRNAs) are small noncoding RNAs that repress the translation of their target genes. It has previously been shown that a target's availability to miRNA can be affected by its structure. G-quadruplexes (G4) are noncanonical structures adopted by G-rich nucleic acids that have been shown to have multiple biological functions. In this study, whether or not G4 structures' presence in the 3' UTRs of mRNAs can hinder miRNA binding was investigated. Putative G4 overlapping with predicted miRNAs' binding sites was searched for, and 44,294 hits were found in humans. The FADS2 mRNA/mir331-3p pair was selected as a model example. In-line probing and G4-specific fluorescent ligand experiments binding were performed and confirmed the presence of a G4 near the predicted miRNA binding site. Subsequent luciferase assays showed that the presence of the G4 prevents the binding of mir331-3p in cellulo. Together, these results served as proof of concept that a G4 structure present in a 3' UTR sequence should be taken into consideration when predicting miRNA binding sites.
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