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Differential gene expression reveals mitochondrial dysfunction in an imprinting center deletion mouse model of
Puya G Yazdi1, Hailing Su, Svetlana Ghimbovschi
1Division of Genetics and Metabolism, Department of Pediatrics, University of California, Irvine, California, USA.
Insights
Prader-Willi syndrome (PWS) involves altered energy metabolism, with significant changes in mitochondrial gene expression observed in affected tissues. Cardiac mitochondrial complex activity was notably upregulated in PWS mouse models, suggesting a role in the disorder's development.
Area of Science:
- Genetics
- Metabolic Disorders
- Mitochondrial Biology
Background:
- Prader-Willi syndrome (PWS) is a genetic disorder characterized by hypotonia, obesity, and developmental issues.
- Previous research suggests impaired energy metabolism contributes to PWS pathogenesis.
- Mitochondrial dysfunction is increasingly implicated in complex genetic disorders.
Purpose of the Study:
- To investigate the role of energy metabolism, specifically mitochondrial gene expression and function, in Prader-Willi syndrome.
- To identify specific mitochondrial genes and pathways affected in PWS.
- To explore potential therapeutic targets related to energy metabolism in PWS.
Main Methods:
- Differential gene expression analysis of mitochondrial genes in PWS muscle and brain tissues.
- Assessment of mitochondrial oxidative phosphorylation enzyme activities in various tissues (brain, heart, liver, muscle) of PWS mouse models.
- Comparison of enzyme activities between PWS imprinting center deletion mice and wild-type littermates.
Main Results:
- Significant differential expression of 95 mitochondrial genes in PWS muscle and 66 in PWS brain.
- Up-regulation of cardiac mitochondrial complexes II+III enzyme activities in PWS imprinting center deletion mice compared to controls.
- Tissue-specific alterations in mitochondrial gene expression and function were identified.
Conclusions:
- Differential expression of mitochondrial genes is a key feature in the pathophysiology of Prader-Willi syndrome.
- Altered mitochondrial function, particularly in the heart, may contribute to the metabolic derangements observed in PWS.
- Targeting mitochondrial pathways could offer novel therapeutic strategies for PWS management.
Abstract:
Prader-Willi syndrome (PWS) is a genetic disorder caused by deficiency of imprinted gene expression from the paternal chromosome 15q11-15q13 and clinically characterized by neonatal hypotonia, short stature, cognitive impairment, hypogonadism, hyperphagia, morbid obesity, and diabetes. Previous clinical studies suggest that a defect in energy metabolism may be involved in the pathogenesis of PWS. We focused our attention on the genes associated with energy metabolism and found that there were 95 and 66 mitochondrial genes differentially expressed in PWS muscle and brain, respectively. Assessment of enzyme activities of mitochondrial oxidative phosphorylation complexes in the brain, heart, liver, and muscle were assessed. We found the enzyme activities of the cardiac mitochondrial complexes II+III were up-regulated in the PWS imprinting center deletion mice compared to the wild-type littermates. These studies suggest that differential gene expression, especially of the mitochondrial genes may contribute to the pathophysiology of PWS.
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