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Updated: Dec 27, 2025
Use of In vivo Imaging to Monitor the Progression of Experimental Mouse Cytomegalovirus Infection in Neonates
Published on: July 6, 2013
Murine cytomegalovirus infection exacerbates complex IV deficiency in a model of mitochondrial disease
Nicola Ferreira1,2, Christopher E Andoniou3,4, Kara L Perks1,2
1Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, Australia.
Abstract:
The influence of environmental insults on the onset and progression of mitochondrial diseases is unknown. To evaluate the effects of infection on mitochondrial disease we used a mouse model of Leigh Syndrome, where a missense mutation in the Taco1 gene results in the loss of the translation activator of cytochrome c oxidase subunit I (TACO1) protein. The mutation leads to an isolated complex IV deficiency that mimics the disease pathology observed in human patients with TACO1 mutations. We infected Taco1 mutant and wild-type mice with a murine cytomegalovirus and show that a common viral infection exacerbates the complex IV deficiency in a tissue-specific manner. We identified changes in neuromuscular morphology and tissue-specific regulation of the mammalian target of rapamycin pathway in response to viral infection. Taken together, we report for the first time that a common stress condition, such as viral infection, can exacerbate mitochondrial dysfunction in a genetic model of mitochondrial disease.
Insights
Viral infections worsen mitochondrial disease in a genetic mouse model. This study reveals how common infections can exacerbate complex IV deficiency, impacting neuromuscular tissues and the mTOR pathway.
Area of Science:
- Mitochondrial Biology
- Neuroscience
- Immunology
Background:
- Mitochondrial diseases are a group of debilitating genetic disorders.
- The impact of environmental factors like infections on mitochondrial disease progression is poorly understood.
- Leigh Syndrome, a severe mitochondrial disorder, can be caused by mutations affecting mitochondrial protein synthesis.
Purpose of the Study:
- To investigate the influence of viral infection on mitochondrial dysfunction.
- To examine the effects of infection on a mouse model of Leigh Syndrome with a TACO1 mutation.
- To explore the relationship between viral infection, mitochondrial complex IV deficiency, and neuromuscular pathology.
Main Methods:
- Utilized a mouse model with a missense mutation in the Taco1 gene, leading to isolated complex IV deficiency.
- Infected both mutant and wild-type mice with murine cytomegalovirus.
- Analyzed tissue-specific changes in mitochondrial function, neuromuscular morphology, and the mammalian target of rapamycin (mTOR) pathway.
Main Results:
- Viral infection exacerbated complex IV deficiency in a tissue-specific manner in the Taco1 mutant mice.
- Significant alterations in neuromuscular morphology were observed post-infection.
- Tissue-specific regulation of the mTOR pathway was identified as a response to viral infection.
Conclusions:
- Viral infections can significantly worsen mitochondrial dysfunction in genetic models of mitochondrial disease.
- This study provides the first evidence that common stress conditions like viral infections exacerbate mitochondrial dysfunction.
- Findings highlight the interplay between environmental insults and genetic predisposition in mitochondrial disease pathogenesis.
