PUBLICATION

Spatacsin and spastizin act in the same pathway required for proper spinal motor neuron axon outgrowth in zebrafish

Authors
Martin, E., Yanicostas, C., Rastetter, A., Naini, S.M., Maouedj, A., Kabashi, E., Rivaud-Péchoux, S., Brice, A., Stevanin, G., and Soussi-Yanicostas, N.
ID
ZDB-PUB-120718-41
Date
2012
Source
Neurobiology of disease   48(3): 299-308 (Journal)
Registered Authors
Soussi-Yanicostas, Nadia
Keywords
hereditary spastic paraplegia, SPG11, SPG15, spatacsin, spastzin, zebrafish, morpholino-oligonucleotide, spinal cord, motor neuron disease
MeSH Terms
  • Animals
  • Axons/metabolism*
  • Carrier Proteins/metabolism
  • Embryo, Nonmammalian
  • Immunohistochemistry
  • In Situ Nick-End Labeling
  • Motor Neurons/metabolism*
  • Neurogenesis/physiology*
  • Proteins/metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Homology, Amino Acid
  • Zebrafish/embryology*
  • Zebrafish/metabolism
  • Zebrafish Proteins/metabolism*
PubMed
22801083 Full text @ Neurobiol. Dis.
Abstract

Hereditary spastic paraplegias (HSPs) are rare neurological conditions caused by degeneration of the long axons of the cerebrospinal tracts, leading to locomotor impairment and additional neurological symptoms. There are more than 40 different causative genes, 24 of which have been identified, including SPG11 and SPG15 mutated in complex clinical forms. Since the vast majority of the causative mutations lead to loss of function of the corresponding proteins, we made use of morpholino-oligonucleotide (MO)-mediated gene knock-down to generate zebrafish models of both SPG11 and SPG15 and determine how invalidation of the causative genes (zspg11 and zspg15) during development might contribute to the disease. Micro-injection of MOs targeting each gene caused locomotor impairment and abnormal branching of spinal cord motor neurons at the neuromuscular junction. More severe phenotypes with abnormal tail developments were also seen. Moreover, partial depletion of both proteins at sub-phenotypic levels resulted in the same phenotypes, suggesting for the first time, in vivo, a genetic interaction between these genes. In conclusion, the zebrafish orthologues of the SPG11 and SPG15 genes are important for proper development of the axons of spinal motor neurons and likely act in a common pathway to promote their proper path finding towards the neuromuscular junction.

Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes