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Precisely regulated spatiotemporal gene expression is essential for the establishment of neural circuits. In contrast to the increasing evidence for transcriptional regulation of axon guidance cues and receptors, the role of posttranscriptional regulation in axon guidance, especially in vivo, remains poorly characterized. Here, we demonstrate that the expression of Slit receptor Robo3/Rig-1, which...
We studied, using avian embryos, mechanisms underlying the three-dimensional assembly of the dorsal aorta, the first-forming embryonic vessel in amniotes. This vessel originates from two distinct cell populations, the splanchnic and somitic mesoderms. We have unveiled a role for Notch signaling in the somitic contribution. Upon activation of Notch signaling, a subpopulation of cells in the posterior...
Asymmetric cell division is a mechanism for achieving cellular diversity. In C. elegans, many asymmetric cell divisions are controlled by the Wnt-MAPK pathway through POP-1/TCF. It is poorly understood, however, how POP-1 determines the specific fates of daughter cells. We found that nob-1/Hox, ceh-20/Pbx, and a Meis-related gene, psa-3, are required for asymmetric division of the T hypodermal cell...
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