ZFIN ID: ZDB-PUB-160213-6
ALS-linked protein disulfide isomerase variants cause motor dysfunction
Woehlbier, U., Colombo, A., Saaranen, M.J., Pérez, V., Ojeda, J., Bustos, F.J., Andreu, C.I., Torres, M., Valenzuela, V., Medinas, D.B., Rozas, P., Vidal, R.L., Lopez-Gonzalez, R., Salameh, J., Fernandez-Collemann, S., Muñoz, N., Matus, S., Armisen, R., Sagredo, A., Palma, K., Irrazabal, T., Almeida, S., Gonzalez-Perez, P., Campero, M., Gao, F.B., Henny, P., van Zundert, B., Ruddock, L.W., Concha, M.L., Henriquez, J.P., Brown, R.H., Hetz, C.
Date: 2016
Source: The EMBO journal   35(8): 845-65 (Journal)
Registered Authors: Concha, Miguel
Keywords: ERp57, PDIA1, amyotrophic lateral sclerosis, protein disulfide isomerase
MeSH Terms:
  • Amyotrophic Lateral Sclerosis/genetics*
  • Amyotrophic Lateral Sclerosis/pathology
  • Animals
  • Animals, Genetically Modified
  • Electromyography
  • Embryo, Nonmammalian
  • Endoplasmic Reticulum Stress/genetics
  • Humans
  • Mice, Knockout
  • Motor Neurons/pathology*
  • Mutation
  • Neurites/pathology
  • Procollagen-Proline Dioxygenase/genetics*
  • Procollagen-Proline Dioxygenase/metabolism
  • Protein Disulfide-Isomerases/genetics*
  • Protein Disulfide-Isomerases/metabolism
  • Zebrafish/embryology
  • Zebrafish/genetics
PubMed: 26869642 Full text @ EMBO J.
Disturbance of endoplasmic reticulum (ER) proteostasis is a common feature of amyotrophic lateral sclerosis (ALS). Protein disulfide isomerases (PDIs) are ER foldases identified as possible ALS biomarkers, as well as neuroprotective factors. However, no functional studies have addressed their impact on the disease process. Here, we functionally characterized four ALS-linked mutations recently identified in two major PDI genes, PDIA1 and PDIA3/ERp57. Phenotypic screening in zebrafish revealed that the expression of these PDI variants induce motor defects associated with a disruption of motoneuron connectivity. Similarly, the expression of mutant PDIs impaired dendritic outgrowth in motoneuron cell culture models. Cellular and biochemical studies identified distinct molecular defects underlying the pathogenicity of these PDI mutants. Finally, targeting ERp57 in the nervous system led to severe motor dysfunction in mice associated with a loss of neuromuscular synapses. This study identifies ER proteostasis imbalance as a risk factor for ALS, driving initial stages of the disease.