Laboratory approach to mitochondrial diseases.

Area of Science:

• Biochemistry
• Cell Biology
• Pathology

Background:

• Mitochondrial dysfunction is linked to numerous pathologies, including inherited syndromes (e.g., MERRF, MELAS), neurodegenerative diseases (e.g., Parkinson's, Alzheimer's), and aging.
• Oxidative imbalance from defects in metabolic pathways (pyruvate metabolism, fatty acid oxidation, citric acid cycle, electron transport chain) underlies these conditions.
• Mitochondria are targets for xenobiotics (e.g., aspirin, alcohol), suggesting impairment as a toxicity mechanism.

Purpose of the Study:

• To review the laboratory approach to diagnosing mitochondrial diseases.
• To highlight emerging non-invasive techniques for assessing mitochondrial function.
• To emphasize the clinical value of the 2-keto[1-(13)C]isocaproic acid breath test.

Main Methods:

• Review of existing laboratory diagnostic methods for mitochondrial disorders.
• Discussion of non-invasive assessment techniques, including nuclear magnetic resonance and breath tests.
• Focus on the 2-keto[1-(13)C]isocaproic acid breath test as a novel diagnostic tool.

Main Results:

• Traditional diagnostic methods often rely on difficult-to-interpret tissue biopsies.
• Non-invasive techniques like nuclear magnetic resonance and the 2-keto[1-(13)C]isocaproic acid breath test show potential for assessing mitochondrial function.
• The 2-keto[1-(13)C]isocaproic acid breath test is presented as a valuable tool for research and diagnosis.

Conclusions:

• Mitochondrial diseases encompass a range of pathologies affecting major organs due to metabolic dysfunction.
• Non-invasive diagnostic methods offer a promising alternative to traditional biopsy-based assays.
• The 2-keto[1-(13)C]isocaproic acid breath test represents a significant advancement in the laboratory approach to mitochondrial diseases.