Suppressing clk-1 restores lifespan and mitochondrial function in psd-1 deficient worms
Targeting ubiquinone biosynthesis counteracted reduced oxygen consumption and rescued lifespan loss caused by mitochondrial phosphatidylethanolamine deficiency in Caenorhabditis elegans.
In the nematode worm Caenorhabditis elegans, researchers established a model of mitochondrial membrane lipid deficiency by knocking down psd-1, the ortholog of human PISD. The enzyme converts phosphatidylserine to phosphatidylethanolamine within the inner mitochondrial membrane. Knocking down psd-1 lowered mitochondrial phosphatidylethanolamine levels by 69.51% compared to controls, causing developmental defects, altered oxygen consumption, and a reduced lifespan of 13.48 days.
To test how this dysfunction translates into pathology, the authors performed a co-knockdown of psd-1 and clk-1, an electron transport chain component involved in ubiquinone biosynthesis. Inhibiting clk-1 normalized oxygen consumption rates and restored worm lifespan to 17.36 days. These results suggest that retrograde signaling mediated by the electron transport chain, rather than phospholipid depletion by itself, drives the physiological defects in this model.
Why it matters
Mitochondrial membrane lipid composition and electron transport chain signaling actively shape cellular stress responses and longevity. Identifying retrograde pathways that overcome lipid-driven mitochondrial defects provides insight into how metabolic and mitochondrial stress might be managed during aging.
Caveats
The study was conducted exclusively in C. elegans using gene knockdown techniques. It remains unknown whether these genetic interactions and retrograde signaling mechanisms function identically in mammalian or human tissues.
- CLK-1 knockdown
- PSD-1 knockdown
- Mitochondrial dysfunction
- Lipid and ceramide metabolism
- Oxidative phosphorylation
- clk-1
- psd-1
- Human PISD-related disease
- Mitochondrial phosphatidylethanolamine
- Oxygen consumption rate
- Caenorhabditis elegans
The paper
Modulating Ubiquinone Biosynthesis Rescues Mitochondrial Dysfunction by Genetic Interaction in a Phosphatidylethanolamine (PE)-Deficient Disease Model
Vadupu L, Mavuduru VA, Basu Ball W
Antioxidants · 20 Sep 2026