Global analyses of the dynamics of mammalian microRNA metabolism
Name
Genome Res.-2019-Kingston-1777-90.pdf
Description
Published version
Size
1.28 MB
Format
Adobe PDF
Checksum (MD5)
dbc319d7897de88129d0776e77ab4b31
Author(s)
Kingston, Elena
Bartel, David
Date Issued
September 2019
Journal
Genome Research
Publisher
Cold Spring Harbor Laboratory
Citation
Kingston, Elena R. and David P. Bartel. "Global analyses of the dynamics of mammalian microRNA metabolism." Genome Research 29, 11 (September 2019): 1777-1790 © 2019 The Authors
Version
Final published version
Abstract
Rates of production and degradation together specify microRNA (miRNA) abundance and dynamics. Here, we used approach-to-steady-state metabolic labeling to assess these rates for 176 miRNAs in contact-inhibited mouse embryonic fibroblasts (MEFs), 182 miRNAs in dividing MEFs, and 127 miRNAs in mouse embryonic stem cells (mESCs). MicroRNA duplexes, each comprising a mature miRNA and its passenger strand, are produced at rates as fast as 110 ± 50 copies/cell/min, which exceeds rates reported for any mRNAs. These duplexes are rapidly loaded into Argonaute, with <30 min typically required for duplex loading and silencing-complex maturation. Within Argonaute, guide strands have stabilities that vary by 100-fold. Half-lives also vary globally between cell lines, with median values ranging from 11 to 34 h in mESCs and contact-inhibited MEFs, respectively. Moreover, relative half-lives for individual miRNAs vary between cell types, implying the influence of cell-specific factors in dictating turnover rate. The apparent influence of miRNA regions most important for targeting, together with the effect of one target on miR-7 accumulation, suggest that targets fulfill this role. Analysis of the tailing and trimming of miRNA 3' termini showed that the flux was typically greatest through the isoform tailed with a single uridine, although changes in this flux did not correspond to changes in stability, which suggested that the processes of tailing and trimming might be independent from that of decay. Together, these results establish a framework for describing the dynamics and regulation of miRNAs throughout their life cycle.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
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DOI of Published Version
https://doi.org/10.1101/gr.251421.119
