Localization mechanisms of the axon guidance molecule UNC-6/Netrin and its receptors, UNC-5 and UNC-40, in Caenorhabditis elegans
2012
Netrin is an evolutionarily conserved, secretory axon guidance molecule. Netrin's receptors, UNC-5 and UNC-40/DCC, are single trans-membrane proteins with immunoglobulin domains at their extra-cellular regions. Netrin is thought to provide its positional information by establishing a concentration gradient. UNC-5 and UNC-40 act at growth cones, which are specialized axonal tip structures that are generally located at a long distance from the neural cell body. Thus, the proper localization of both Netrin and its receptors is critical for their function. This review addresses the localization mechanisms of UNC-6/Netrin and its receptors in Caenorhabditis elegans, focusing on our recent reports. These findings include novel insights on cytoplasmic proteins that function upstream of the receptors.
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