Abstract:
:MicroRNAs (miRNAs) associated with Argonaute proteins (AGOs) regulate gene expression in mammals. miRNA 3' ends are subject to frequent sequence modifications, which have been proposed to affect miRNA stability. However, the underlying mechanism is not well understood. Here, by genetic and biochemical studies as well as deep sequencing analyses, we find that AGO mutations disrupting miRNA 3' binding are sufficient to trigger extensive miRNA 3' modifications in HEK293T cells and in cancer patients. Comparing these modifications in TUT4, TUT7 and DIS3L2 knockout cells, we find that TUT7 is more robust than TUT4 in oligouridylating mature miRNAs, which in turn leads to their degradation by the DIS3L2 exonuclease. Our findings indicate a decay machinery removing AGO-associated miRNAs with an exposed 3' end. A set of endogenous miRNAs including miR-7, miR-222 and miR-769 are targeted by this machinery presumably due to target-directed miRNA degradation.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Yang A,Shao TJ,Bofill-De Ros X,Lian C,Villanueva P,Dai L,Gu Sdoi
10.1038/s41467-020-16533-wsubject
Has Abstractpub_date
2020-06-02 00:00:00pages
2765issue
1issn
2041-1723pii
10.1038/s41467-020-16533-wjournal_volume
11pub_type
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