Abstract
At least three forms of signaling between pre- and postsynaptic partners are necessary during synapse formation. First, "targeting" signals instruct presynaptic axons to recognize and adhere to the correct portion of a postsynaptic target cell. Second, trans-synaptic "organizing" signals induce differentiation in their synaptic partner so that each side of the synapse is specialized for synaptic transmission. Finally, in many regions of the nervous system an excess of synapses are initially formed, therefore "refinement" signals must either stabilize or destabilize the synapse to reinforce or eliminate connections, respectively. Because of both their importance in processing visual information and their accessibility, retinogeniculate synapses have served as a model for studying synaptic development. Molecular signals that drive retinogeniculate "targeting" and "refinement" have been identified, however, little is known about what "organizing" cues are necessary for the differentiation of retinal axons into presynaptic terminals. To identify such "organizing" cues, we used microarray analysis to assess whether any target-derived "synaptic organizers" were enriched in the mouse dorsal lateral geniculate nucleus (dLGN) during ret...Continue Reading
Citations
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