Assembly of Lamina-Specific Neuronal Connections by Slit Bound to Type IV Collagen
作者： Tong Xiao , Wendy Staub , Estuardo Robles , Nathan J. Gosse , Gregory J. Cole
DOI: 10.1016/J.CELL.2011.06.016
关键词:
摘要: The mechanisms that generate specific neuronal connections in the brain are under intense investigation. In zebrafish, retinal ganglion cells project their axons into at least six layers within neuropil of midbrain tectum. Each axon elaborates a single, planar arbor one target and forms synapses onto dendrites tectal neurons. We show laminar specificity retinotectal does not depend on self-sorting interactions among RGC axons. Rather, tectum-derived Slit1, signaling through axonal Robo2, guides neurites to layer. Genetic biochemical studies indicate Slit binds Dragnet (Col4a5), type IV Collagen, which basement membrane surface further radial glial endfeet required for basement-membrane anchoring Slit. propose Slit1 signaling, perhaps form superficial-to-deep gradient, presents positional cues ingrowing
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