Abstract:
:The mechanisms dictating whether a cell proliferates or differentiates have undergone intense scrutiny, but they remain poorly understood. Here, we report that UPF1, a central component in the nonsense-mediated RNA decay (NMD) pathway, plays a key role in this decision by promoting the proliferative, undifferentiated cell state. UPF1 acts, in part, by destabilizing the NMD substrate encoding the TGF-β inhibitor SMAD7 and stimulating TGF-β signaling. UPF1 also promotes the decay of mRNAs encoding many other proteins that oppose the proliferative, undifferentiated cell state. Neural differentiation is triggered when NMD is downregulated by neurally expressed microRNAs (miRNAs). This UPF1-miRNA circuitry is highly conserved and harbors negative feedback loops that act as a molecular switch. Our results suggest that the NMD pathway collaborates with the TGF-β signaling pathway to lock in the stem-like state, a cellular state that is stably reversed when neural differentiation signals that induce NMD-repressive miRNAs are received.
journal_name
Cell Repjournal_title
Cell reportsauthors
Lou CH,Shao A,Shum EY,Espinoza JL,Huang L,Karam R,Wilkinson MFdoi
10.1016/j.celrep.2014.01.028subject
Has Abstractpub_date
2014-02-27 00:00:00pages
748-64issue
4issn
2211-1247pii
S2211-1247(14)00045-Xjournal_volume
6pub_type
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