Abstract
Targeting RNAs appears as an important opportunity to modulate biological processes. Here, we overviewed critical parameters implied in RNAs competition to bind small RNAs. These competitions influence small RNA availability and thereby gene expression and cell fate. We focused on the ability of RNAs to sequester small RNA, mainly the microRNAs (miRNAs) and proposed experimental workflows to demonstrate the existence and activity of RNA-sponge. From this basic science, we detailed tailored oligonucleotides, developed to challenge the binding of small RNA. In vitro and in vivo, these tailored oligonucleotides efficiently restore small RNA activity by preventing their sequestration on RNA-sponges.
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