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Journal Article
Research Support, Non-U.S. Gov't
TRBP maintains mammalian embryonic neural stem cell properties by acting as a novel transcriptional coactivator of the Notch signaling pathway.
Development 2017 March 2
Transactivation response element RNA-binding protein (TRBP; TARBP2) is known to play important roles in human immunodeficiency virus (HIV) replication and microRNA biogenesis. However, recent studies implicate TRBP in a variety of biological processes as a mediator of cross-talk between signal transduction pathways. Here, we provide the first evidence that TRBP is required for efficient neurosphere formation and for the expression of neural stem cell markers and Notch target genes in primary neural progenitor cells in vitro Consistent with this, introduction of TRBP into the mouse embryonic brain in utero increased the fraction of cells expressing Sox2 in the ventricular zone. We also show that TRBP physically interacts with the Notch transcriptional coactivation complex through C promoter-binding factor 1 (CBF1; RBPJ) and strengthens the association between the Notch intracellular domain (NICD) and CBF1, resulting in increased NICD recruitment to the promoter region of a Notch target gene. Our data indicate that TRBP is a novel transcriptional coactivator of the Notch signaling pathway, playing an important role in neural stem cell regulation during mammalian brain development.
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