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2017 ; 8
(1
): 530
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Tia1 dependent regulation of mRNA subcellular location and translation controls
p53 expression in B cells
#MMPMID28904350
Díaz-Muñoz MD
; Kiselev VY
; Le Novère N
; Curk T
; Ule J
; Turner M
Nat Commun
2017[Sep]; 8
(1
): 530
PMID28904350
show ga
Post-transcriptional regulation of cellular mRNA is essential for protein
synthesis. Here we describe the importance of mRNA translational repression and
mRNA subcellular location for protein expression during B lymphocyte activation
and the DNA damage response. Cytoplasmic RNA granules are formed upon cell
activation with mitogens, including stress granules that contain the RNA binding
protein Tia1. Tia1 binds to a subset of transcripts involved in cell stress,
including p53 mRNA, and controls translational silencing and RNA granule
localization. DNA damage promotes mRNA relocation and translation in part due to
dissociation of Tia1 from its mRNA targets. Upon DNA damage, p53 mRNA is released
from stress granules and associates with polyribosomes to increase protein
synthesis in a CAP-independent manner. Global analysis of cellular mRNA abundance
and translation indicates that this is an extended ATM-dependent mechanism to
increase protein expression of key modulators of the DNA damage
response.Sequestering mRNA in cytoplasmic stress granules is a mechanism for
translational repression. Here the authors find that p53 mRNA, present in stress
granules in activated B lymphocytes, is released upon DNA damage and is
translated in a CAP-independent manner.