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2015 ; 16
(6
): 669-83
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An Apela RNA-Containing Negative Feedback Loop Regulates p53-Mediated Apoptosis
in Embryonic Stem Cells
#MMPMID25936916
Li M
; Gou H
; Tripathi BK
; Huang J
; Jiang S
; Dubois W
; Waybright T
; Lei M
; Shi J
; Zhou M
; Huang J
Cell Stem Cell
2015[Jun]; 16
(6
): 669-83
PMID25936916
show ga
Maintaining genomic integrity is of paramount importance to embryonic stem cells
(ESCs), as mutations are readily propagated to daughter cells. ESCs display
hypersensitivity to DNA damage-induced apoptosis (DIA) to prevent such
propagation, although the molecular mechanisms underlying this apoptotic response
are unclear. Here, we report that the regulatory RNA Apela positively regulates
p53-mediated DIA. Apela is highly expressed in mouse ESCs and is repressed by p53
activation, and Apela depletion compromises p53-dependent DIA. Although Apela
contains a coding region, this coding ability is dispensable for Apela's role in
p53-mediated DIA. Instead, Apela functions as a regulatory RNA and interacts with
hnRNPL, which prevents the mitochondrial localization and activation of p53.
Together, these results describe a tri-element negative feedback loop composed of
p53, Apela, and hnRNPL that regulates p53-mediated DIA, and they further
demonstrate that regulatory RNAs add a layer of complexity to the apoptotic
response of ESCs after DNA damage.