Pathways controlling neurotoxicity and proteostasis in mitochondrial complex I deficiency
biorxiv(2024)
摘要
Neuromuscular disorders caused by dysfunction of the mitochondrial respiratory chain are common, severe and untreatable. We recovered a number of mitochondrial genes, including electron transport chain components, in a large forward genetic screen for mutations causing age-related neurodegeneration in the context of proteostasis dysfunction. We created a model of complex I deficiency in the Drosophila retina to probe the role of protein degradation abnormalities in mitochondrial encephalomyopathies. Using our genetic model, we found that complex I deficiency regulates both the ubiquitin/proteasome and autophagy/lysosome arms of the proteostasis machinery. We further performed an in vivo kinome screen to uncover new and potentially druggable mechanisms contributing to complex I related neurodegeneration and proteostasis failure. Reduction of RIOK kinases and the innate immune signaling kinase pelle prevented neurodegeneration in complex I deficiency animals. Genetically targeting oxidative stress, but not RIOK1 or pelle knockdown, normalized proteostasis markers. Our findings outline distinct pathways controlling neurodegeneration and protein degradation in complex I deficiency and introduce an experimentally facile model in which to study these debilitating and currently treatment-refractory disorders.
### Competing Interest Statement
The authors have declared no competing interest.
* GFP
: green fluorescent protein;
RIOK
: right open reading frame kinase;
family NDUFV1
: NADH:ubiquinone oxidoreductase core subunit V1;
ATP
: adenosine triphosphate;
GMR
: glass multimer reporter;
GstD5
: Glutathione S transferase D5;
Mgstl
: Microsomal glutathione S-transferase-like;
Prx3
: peroxiredoxin 3.
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