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Updated: Jul 14, 2025
Author Spotlight: Exploring Mitochondrial Function and Chemical Toxicity Using Drosophila melanogaster
Published on: November 10, 2023
Drosophila Mpv17 forms an ion channel and regulates energy metabolism
Samantha Corrà1, Vanessa Checchetto2, Michele Brischigliaro3
1Veneto Institute of Molecular Medicine (VIMM), Padova, Italy.
Abstract:
Mutations in MPV17 are a major contributor to mitochondrial DNA (mtDNA) depletion syndromes, a group of inherited genetic conditions due to mtDNA instability. To investigate the role of MPV17 in mtDNA maintenance, we generated and characterized a Drosophila melanogaster Mpv17 (dMpv17) KO model showing that the absence of dMpv17 caused profound mtDNA depletion in the fat body but not in other tissues, increased glycolytic flux and reduced lifespan in starvation. Accordingly, the expression of key genes of glycogenolysis and glycolysis was upregulated in dMpv17 KO flies. In addition, we demonstrated that dMpv17 formed a channel in planar lipid bilayers at physiological ionic conditions, and its electrophysiological hallmarks were affected by pathological mutations. Importantly, the reconstituted channel translocated uridine but not orotate across the membrane. Our results indicate that dMpv17 forms a channel involved in translocation of key metabolites and highlight the importance of dMpv17 in energy homeostasis and mitochondrial function.
Insights
The MPV17 protein forms a channel crucial for mitochondrial DNA maintenance and energy balance. Its absence causes mitochondrial DNA depletion and impacts metabolism, highlighting its role in preventing genetic disorders.
Area of Science:
- Mitochondrial Biology
- Genetics
- Molecular Physiology
Background:
- Mutations in MPV17 are linked to mitochondrial DNA (mtDNA) depletion syndromes.
- These syndromes result from inherited genetic conditions causing mtDNA instability.
Purpose of the Study:
- To investigate the role of MPV17 in mtDNA maintenance.
- To characterize a Drosophila melanogaster Mpv17 knockout (KO) model.
Main Methods:
- Generation and characterization of a dMpv17 KO Drosophila model.
- Electrophysiological analysis of dMpv17 in planar lipid bilayers.
- Metabolite translocation assays.
Main Results:
- Absence of dMpv17 led to significant mtDNA depletion in the fat body.
- dMpv17 KO flies exhibited increased glycolytic flux, upregulated glycogenolysis and glycolysis genes, and reduced lifespan during starvation.
- Reconstituted dMpv17 formed a channel that translocated uridine but not orotate.
Conclusions:
- dMpv17 functions as a channel protein involved in the translocation of essential metabolites.
- The study highlights the importance of dMpv17 in maintaining energy homeostasis and mitochondrial function.
- This research provides insights into the molecular mechanisms underlying MPV17-related genetic disorders.
