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ZFIN ID: ZDB-PUB-161203-13
Neuronal Ndrg4 Is Essential for Nodes of Ranvier Organization in Zebrafish
Fontenas, L., De Santis, F., Di Donato, V., Degerny, C., Chambraud, B., Del Bene, F., Tawk, M.
Date: 2016
Source: PLoS Genetics   12: e1006459 (Journal)
Registered Authors: Del Bene, Filippo, De Santis, Flavia, Fontenas, Laura, Tawk, Marcel
Keywords: Embryos, Sodium channels, Axons, Vesicles, Zebrafish, Ranvier's nodes, Neurons, Axonal transport
MeSH Terms:
  • Animals
  • Axons/metabolism
  • Exocytosis/genetics
  • Gene Expression Regulation
  • Humans
  • Muscle Proteins/genetics*
  • Muscle Proteins/metabolism
  • N-Ethylmaleimide-Sensitive Proteins/biosynthesis*
  • N-Ethylmaleimide-Sensitive Proteins/genetics
  • Neuroglia/metabolism
  • Neurons/metabolism
  • Ranvier's Nodes/genetics*
  • Ranvier's Nodes/metabolism
  • Schwann Cells
  • Sodium Channels/genetics
  • Sodium Channels/metabolism
  • Synaptic Transmission/genetics
  • Synaptosomal-Associated Protein 25/biosynthesis*
  • Synaptosomal-Associated Protein 25/genetics
  • Zebrafish/genetics*
  • Zebrafish/metabolism
  • Zebrafish Proteins/biosynthesis*
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/metabolism
PubMed: 27902705 Full text @ PLoS Genet.
Axon ensheathment by specialized glial cells is an important process for fast propagation of action potentials. The rapid electrical conduction along myelinated axons is mainly due to its saltatory nature characterized by the accumulation of ion channels at the nodes of Ranvier. However, how these ion channels are transported and anchored along axons is not fully understood. We have identified N-myc downstream-regulated gene 4, ndrg4, as a novel factor that regulates sodium channel clustering in zebrafish. Analysis of chimeric larvae indicates that ndrg4 functions autonomously within neurons for sodium channel clustering at the nodes. Molecular analysis of ndrg4 mutants shows that expression of snap25 and nsf are sharply decreased, revealing a role of ndrg4 in controlling vesicle exocytosis. This uncovers a previously unknown function of ndrg4 in regulating vesicle docking and nodes of Ranvier organization, at least through its ability to finely tune the expression of the t-SNARE/NSF machinery.