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2014 ; 56
(1
): 104-15
Nephropedia Template TP
gab.com Text
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English Wikipedia
mRNA destabilization is the dominant effect of mammalian microRNAs by the time
substantial repression ensues
#MMPMID25263593
Eichhorn SW
; Guo H
; McGeary SE
; Rodriguez-Mias RA
; Shin C
; Baek D
; Hsu SH
; Ghoshal K
; Villén J
; Bartel DP
Mol Cell
2014[Oct]; 56
(1
): 104-15
PMID25263593
show ga
MicroRNAs (miRNAs) regulate target mRNAs through a combination of translational
repression and mRNA destabilization, with mRNA destabilization dominating at
steady state in the few contexts examined globally. Here, we extend the global
steady-state measurements to additional mammalian contexts and find that
regardless of the miRNA, cell type, growth condition, or translational state,
mRNA destabilization explains most (66%->90%) miRNA-mediated repression. We also
determine the relative dynamics of translational repression and mRNA
destabilization for endogenous mRNAs as a miRNA is induced. Although
translational repression occurs rapidly, its effect is relatively weak, such that
by the time consequential repression ensues, the effect of mRNA destabilization
dominates. These results imply that consequential miRNA-mediated repression is
largely irreversible and provide other insights into the nature of miRNA-mediated
regulation. They also simplify future studies, dramatically extending the known
contexts and time points for which monitoring mRNA changes captures most of the
direct miRNA effects.