Loop-miRs: active microRNAs generated from single-stranded loop regions
MicroRNAs (miRNAs) are key mediators of post-transcriptional gene regulation. The miRNA precursors are processed by the endonucleases Drosha and Dicer into a duplex, bound to an Argonaute protein and unwound into two single-stranded miRNAs. Although alternative ways to generate miRNAs have been disc...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
10 April 2013
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| In: |
Nucleic acids research
Year: 2013, Volume: 41, Issue: 10, Pages: 5503-5512 |
| ISSN: | 1362-4962 |
| DOI: | 10.1093/nar/gkt251 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/nar/gkt251
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| Author Notes: | Julia Winter, Steffen Link, Dominik Witzigmann, Catherina Hildenbrand, Christopher Previti and Sven Diederichs |
| Summary: | MicroRNAs (miRNAs) are key mediators of post-transcriptional gene regulation. The miRNA precursors are processed by the endonucleases Drosha and Dicer into a duplex, bound to an Argonaute protein and unwound into two single-stranded miRNAs. Although alternative ways to generate miRNAs have been discovered, e.g. pre-miRNA cleavage by Ago2 or cleavage products of snoRNAs or tRNAs, all known pathways converge on a double-stranded RNA duplex. Exogenous single-stranded siRNAs (ss-siRNAs) can elicit an effective RNA interference reaction; recent studies have identified chemical modifications increasing their stability and activity. Here, we provide first evidence that endogenous, unmodified, single-stranded RNA sequences are generated from single-stranded loop regions of human pre-miRNA hairpins, the so called loop-miRs. Luciferase assays and immunoprecipitation validate loop-miR activity and incorporation into RNA-induced silencing complexes. This study identifies endogenous miRNAs that are generated from single-stranded regions; hence, it provides evidence that precursor-miRNAs can give rise to three distinct endogenous miRNAs: the guide strand, the passenger strand and the loop-miR. |
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| Item Description: | Gesehen am 16.11.2021 |
| Physical Description: | Online Resource |
| ISSN: | 1362-4962 |
| DOI: | 10.1093/nar/gkt251 |