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Eph receptor tyrosine kinases and their corresponding surface-bound ligands, the ephrins, provide cues to the migration of cells and growth cones during embryonic development. Here we show that ephrin-A5, which is attached to the outer leaflet of the plasma membrane by a glycosyl-phosphatidylinositol-anchor, induces compartmentalized signaling within a(More)
In development, tissue regeneration or certain diseases, angiogenic growth leads to the expansion of blood vessels and the lymphatic vasculature. This involves endothelial cell proliferation as well as angiogenic sprouting, in which a subset of cells, termed tip cells, acquires motile, invasive behaviour and extends filopodial protrusions. Although it is(More)
Maintaining a balance between self-renewal and differentiation in neural progenitor cells during development is important to ensure that correct numbers of neural cells are generated. We report that the ephrin-B-PDZ-RGS3 signaling pathway functions to regulate this balance in the developing mammalian cerebral cortex. During cortical neurogenesis, expression(More)
Eph receptor tyrosine kinases and their membrane-bound ligand ephrins form an essential cell communication system. Both ephrin classes have been shown to localize within cell surface lipid rafts, yet regulate different biological processes. In order to provide insight into this distinct behavior, we examined ephrin-A5 and B1 localization and signaling in(More)
Eph receptors and ephrin ligands are key players in many developmental processes including embryo patterning, angiogenesis, and axon guidance. Eph/ephrin interactions lead to the generation of a bidirectional signal, in which both the Eph receptors and the ephrins activate downstream signaling cascades simultaneously. To understand the role of ephrin-B1 and(More)
Mutations in X-linked ephrin-B1 in humans cause craniofrontonasal syndrome (CFNS), a disease that affects female patients more severely than males. Sorting of ephrin-B1-positive and -negative cells following X-inactivation has been observed in ephrin-B1(+/-) mice; however, the mechanisms by which mosaic ephrin-B1 expression leads to cell sorting and(More)
Eph receptors and ephrins have captured the interest of the developmental biology community in recent years for their pleiotropic functions during embryogenesis. Loss-of-function studies using various animal models have demonstrated the involvement of Ephs and ephrins in many aspects of embryogenesis including segmentation, neural crest cells migration,(More)
Apical neural progenitors are polarized cells for which the apical membrane is the site of cell-cell and cell-extracellular matrix adhesion events that are essential for maintaining the integrity of the developing neuroepithelium. Apical adhesion is important for several aspects of the nervous system development, including morphogenesis and neurogenesis,(More)
M utations in the voltage gated potassium channels KCNQ2 (OMIM 602235) and KCNQ3 (OMIM 602232) are associated with an autosomal dominant idiopathic epilepsy syndrome of newborns, benign familial neonatal seizures (BFNS) (OMIM 121200). BFNS is char-acterised by unprovoked partial seizures typically beginning when the infant is around three days old. BFNS(More)
Axon fasciculation is one of the processes controlling topographic innervation during embryonic development. While axon guidance steers extending axons in the accurate direction, axon fasciculation allows sets of co-extending axons to grow in tight bundles. The Eph:ephrin family has been involved both in axon guidance and fasciculation, yet it remains(More)