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Updated: May 8, 2026
07:03
Robust Mitochondrial Isolation from Rodent Cardiac Tissue
Published on: August 23, 2024
Cardiac dysfunction in mitochondrial disease. Clinical and molecular features
Pedro Villar1, Begoña Bretón, Pablo García-Pavía
1Biochemistry Unit, "Hospital Universitario Puerta de Hierro"
Summary
Cardiac dysfunction can be an early sign of mitochondrial disorders (MD). Sequencing mitochondrial DNA (mtDNA) in patients with heart issues is crucial for diagnosing MD and identifying pathogenic variants.
Area of Science:
- Cardiology
- Genetics
- Neurology
Background:
- Mitochondrial disorders (MD) are multisystem diseases stemming from oxidative phosphorylation dysfunction.
- Neuromuscular symptoms often dominate MD, potentially masking cardiac involvement.
- Cardiac dysfunction is a significant, yet sometimes overlooked, phenotype in MD.
Purpose of the Study:
- To characterize clinical and molecular features of patients with cardiomyopathy and MD.
- To investigate the link between cardiac dysfunction and mitochondrial dysfunction.
- To identify genetic factors contributing to mitochondrial cardiomyopathy.
Main Methods:
- Retrospective review of 2,520 patient charts evaluated for presumed MD.
- Inclusion criteria: cardiac disturbance with confirmed mitochondrial dysfunction.
- Sequencing of mitochondrial genome (mtDNA) in 45 patients; functional assays for variant pathogenicity.
Main Results:
- Only 71 patients met the study criteria.
- Three potentially relevant and three confirmed pathogenic nucleotide changes in mtDNA were identified.
- No mutations were found in the 13 nuclear genes analyzed.
Conclusions:
- mtDNA sequencing is recommended for patients with cardiac dysfunction and suggestive MD symptoms.
- Databases require screening for MD-associated mitochondrial variants.
- Functional assays are essential for classifying mtDNA variants.
- Further research is needed to identify nuclear genes in mitochondrial cardiomyopathy.
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