Cited by 90Amyotrophic Lateral Sclerosis ResearchHereditary Neurological DisordersMuscle Physiology and Disorders

Sqstm1 knock-down causes a locomotor phenotype ameliorated by rapamycin in a zebrafish model of ALS/FTLD

Lattante, Serena, de Calbiac, Hortense, Le Ber, Isabelle, Brice, Alexis, Ciura, Sorana, Kabashi, Edor·2015·Human Molecular Genetics

Abstract

Mutations in SQSTM1, encoding for the protein SQSTM1/p62, have been recently reported in 1-3.5% of patients with amyotrophic lateral sclerosis and frontotemporal lobar degeneration (ALS/FTLD). Inclusions positive for SQSTM1/p62 have been detected in patients with neurodegenerative disorders, including ALS/FTLD. In order to investigate the pathogenic mechanisms induced by SQSTM1 mutations in ALS/FTLD, we developed a zebrafish model. Knock-down of the sqstm1 zebrafish ortholog, as well as impairment of its splicing, led to a specific phenotype, consisting of behavioral and axonal anomalies. Here, we report swimming deficits associated with shorter motor neuronal axons that could be rescued by the overexpression of wild-type human SQSTM1. Interestingly, no rescue of the loss-of-function phenotype was observed when overexpressing human SQSTM1 constructs carrying ALS/FTLD-related mutations. Consistent with its role in autophagy regulation, we found increased mTOR levels upon knock-down of sqstm1. Furthermore, treatment of zebrafish embryos with rapamycin, a known inhibitor of the mTOR pathway, yielded an amelioration of the locomotor phenotype in the sqstm1 knock-down model. Our results suggest that loss-of-function of SQSTM1 causes phenotypic features characterized by locomotor deficits and motor neuron axonal defects that are associated with a misregulation of autophagic processes.

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Crossref · 10.1093/hmg/ddu580

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  • Knockdown of the SQSTM1 ortholog in zebrafish leads to an ALS-like phenotype consisting of locomotor and motor neuron axonal abnormalities, which is rescued by overexpression of wild-type human SQSTM1 or rapamycin.

    “Knockdown of the SQSTM1 ortholog in zebrafish leads to an ALS-like phenotype consisting of locomotor and motor neuron axonal abnormalities. Overexpression of wild-type human SQSTM1 or application of the autophagy activator rapamycin rescues these phenotypes [137].”

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Authors
Lattante, S., de Calbiac, H., Le Ber, I., Brice, A., Ciura, S., & Kabashi, E.
Affiliations
Centre National de la Recherche Scientifique (FR)
Corresponding author
  • Ciura, Sorana
  • Kabashi, Edor
Venue
Human Molecular Genetics
Published
2014-11-19
Volume
24
Issue
6
Pages
1682-1690
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2155383466
Cited by
90
References
55
Citations by year
2026: 4 · 2025: 7 · 2024: 8 · 2023: 8 · 2022: 12 · 2021: 10 · 2020: 9 · 2019: 4 · 2018: 6 · 2017: 11 · 2016: 6 · 2015: 4 · 2013: 1
FWCI
4.56
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • AIRUS (submittedVersion)
Funders
  • Agence Nationale de la Recherche (ANR-10-IAIHU06, 10-IAIHU-06, ANR-10)
  • Institut National de la Santé et de la Recherche Médicale (ANR-10-IAIHU-06)
  • Fondation pour la Recherche Médicale (PLP20141031462, ANR-10-IAIHU-06)
  • Association pour la Recherche sur la Sclérose Latérale Amyotrophique et autres Maladies du Motoneurone (ANR-10-IAIHU-06)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
p62, amyotrophic lateral sclerosis, frontotemporal lobar degeneration, zebrafish model, locomotor deficits, rapamycin, mTOR signaling, autophagy, splicing mutation, loss-of-function phenotypes, neurodegeneration
MeSH terms
Sequestosome-1 Protein, Amyotrophic Lateral Sclerosis, Animals, Disease Models, Animal, Locomotion, Phenotype, Zebrafish, Sirolimus, Zebrafish Proteins, Adaptor Proteins, Signal Transducing, Gene Knockdown Techniques, Frontotemporal Lobar Degeneration, TOR Serine-Threonine Kinases

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