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2014 ; 33
(19
): 2201-15
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Post-transcriptional gene expression control by NANOS is up-regulated and
functionally important in pRb-deficient cells
#MMPMID25100735
Miles WO
; Korenjak M
; Griffiths LM
; Dyer MA
; Provero P
; Dyson NJ
EMBO J
2014[Oct]; 33
(19
): 2201-15
PMID25100735
show ga
Inactivation of the retinoblastoma tumor suppressor (pRb) is a common oncogenic
event that alters the expression of genes important for cell cycle progression,
senescence, and apoptosis. However, in many contexts, the properties of
pRb-deficient cells are similar to wild-type cells suggesting there may be
processes that counterbalance the transcriptional changes associated with pRb
inactivation. Therefore, we have looked for sets of evolutionary conserved,
functionally related genes that are direct targets of pRb/E2F proteins. We show
that the expression of NANOS, a key facilitator of the Pumilio (PUM)
post-transcriptional repressor complex, is directly repressed by pRb/E2F in flies
and humans. In both species, NANOS expression increases following inactivation of
pRb/RBF1 and becomes important for tissue homeostasis. By analyzing datasets from
normal retinal tissue and pRb-null retinoblastomas, we find a strong enrichment
for putative PUM substrates among genes de-regulated in tumors. These include
pro-apoptotic genes that are transcriptionally down-regulated upon pRb loss, and
we characterize two such candidates, MAP2K3 and MAP3K1, as direct PUM substrates.
Our data suggest that NANOS increases in importance in pRb-deficient cells and
helps to maintain homeostasis by repressing the translation of transcripts
containing PUM Regulatory Elements (PRE).