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Start free with EleplanMitochondrial DNA-related mitochondrial myopathy
ORPHA:254788Clinical group
Also called Maternally-inherited mitochondrial myopathy · mtDNA-related mitochondrial myopathy
What it is
A group of rare mitochondrial oxidative phosphorylation disorders due to mitochondrial DNA anomalies characterized by progressive, most commonly proximal, myopathy with variable degrees of weakness, exercise-induced muscle pain, and fatigue. Progressive external ophthalmoplegia is often observed. Additional features include neurological signs and symptoms (such as seizures, stroke-like episodes, or developmental delay), cardiomyopathy, involvement of liver, kidneys, and gastrointestinal tract, and diabetes. Lactic acidosis is frequently present, while recurrent rhabdomyolysis and myoglobinuria are rare. Muscle biopsy may reveal the presence of ragged-red fibers and a mosaic pattern of cytochrome c oxidase-negative fibers.
Key facts
- Inheritance
- Mitochondrial inheritance
- Classified as
- Clinical group
Genes reported in subtypes
Orphanet records these genes on 3 more specific entries under this disorder, not on this entry itself:
A well-studied disease is usually split into subtypes, and the gene is curated on whichever one the evidence belongs to. Open a subtype to see which gene goes with it.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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