Why Don't More Mitochondrial Diseases Exhibit Cardiomyopathy?
Nina Singh1, Mindong Ren2,3, Colin K L Phoon1
1Division of Pediatric Cardiology, Department of Pediatrics, New York University Grossman School of Medicine, New York, NY 10016, USA.
Journal of Cardiovascular Development and Disease
|April 27, 2023
Summary
Mitochondrial diseases affect heart energy, but not all cause cardiomyopathy. Gene defects in energy production, particularly oxidative phosphorylation, are linked to cardiomyopathy, though other factors also play a role.
Area of Science:
- Genetics
- Cardiology
- Biochemistry
Background:
- The heart's high energy demand makes it vulnerable to mitochondrial dysfunction.
- Despite this, only 20-40% of children with mitochondrial diseases develop cardiomyopathies.
Purpose of the Study:
- To investigate genetic differences between mitochondrial diseases with and without cardiomyopathy.
- To explore energy deficits and protein characteristics associated with cardiomyopathy in mitochondrial disease.
Main Methods:
- Utilized the Mitochondrial Disease Genes Compendium to identify relevant genes.
- Analyzed non-oxidative phosphorylation (OXPHOS) genes, protein size, and interactors.
- Identified mouse models for affected mitochondrial genes.
Main Results:
- 44% of mitochondrial genes were associated with cardiomyopathy, with 46% of these being OXPHOS genes.
- Defects in OXPHOS (p=0.001) and fatty acid oxidation (p=0.009) were significantly linked to cardiomyopathy.
- Larger OXPHOS proteins and defects in aerobic respiration were also associated with cardiomyopathy.
Conclusions:
- Energy production defects are strongly linked to cardiomyopathy in mitochondrial diseases.
- However, the relationship is inconsistent and likely multifactorial, involving tissue specificity, clinical data, and genetic background.
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