ALS-associated VRK1 R321C mutation causes proteostatic imbalance and mitochondrial defects in iPSC-derived motor neurons.
Neurobiol Dis
; 198: 106540, 2024 Aug.
Article
in En
| MEDLINE
| ID: mdl-38806131
ABSTRACT
Vaccinia-related kinase 1 (VRK1) is a gene which has been implicated in the pathological process of a broad range of neurodevelopmental disorders as well as neuropathies, such as Amyotrophic Lateral Sclerosis (ALS). Here we report a family presenting ALS in an autosomal recessive mode of inheritance, segregating with a homozygous missense mutation located in VRK1 gene (p.R321C; Arg321Cys). Proteomic analyses from iPSC-derived motor neurons identified 720 proteins eligible for subsequent investigation, and our exploration of protein profiles revealed significant enrichments in pathways such as mTOR signaling, E2F, MYC targets, DNA repair response, cell proliferation and energetic metabolism. Functional studies further validated such alterations, showing that affected motor neurons presented decreased levels of global protein output, ER stress and downregulation of mTOR signaling. Mitochondrial alterations also pointed to decreased reserve capacity and increased non-mitochondrial oxygen consumption. Taken together, our results present the main pathological alterations associated with VRK1 mutation in ALS.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Protein Serine-Threonine Kinases
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Induced Pluripotent Stem Cells
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Amyotrophic Lateral Sclerosis
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Mitochondria
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Motor Neurons
Limits:
Adult
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Female
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Humans
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Male
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Middle aged
Language:
En
Journal:
Neurobiol Dis
Journal subject:
NEUROLOGIA
Year:
2024
Document type:
Article
Country of publication: