Mitochondrial myopathy
From Infogalactic: the planetary knowledge core
| Mitochondrial myopathy | |
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Simplified structure of a typical mitochondrion
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| Classification and external resources | |
| Specialty | Lua error in Module:Wikidata at line 446: attempt to index field 'wikibase' (a nil value). |
| ICD-10 | G71.3 |
| Patient UK | Mitochondrial myopathy |
| MeSH | D017240 |
Mitochondrial myopathies are types of myopathies associated with mitochondrial disease. On biopsy, the muscle tissue of patients with these diseases usually demonstrate "ragged red" muscle fibers. These ragged-red fibers contain mild accumulations of glycogen and neutral lipids, and may show an increased reactivity for succinate dehydrogenase and a decreased reactivity for cytochrome c oxidase. Inheritance is maternal (non-Mendelian extranuclear). There are several subcategories of mitochondrial myopathies.
Treatment
Although no cure currently exists, there is hope in treatment for this class of hereditary diseases with the use of an embryonic mitochondrial transplant.[1]
Signs and symptoms
Signs and symptoms include:
- Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like syndrome (MELAS)
- Varying degrees of cognitive impairment and dementia
- Lactic acidosis
- Strokes
- Transient ischemic attacks
- Hearing loss
- Weight loss
- Myoclonic epilepsy and ragged-red fibers (MERRF)
- Progressive myoclonic epilepsy
- Clumps of diseased mitochondria accumulate in muscle fibers and appear as "ragged-red fibers" when muscle is stained with modified Gömöri trichrome stain
- Short stature
- Kearns-Sayre syndrome (KSS)
- External ophthalmoplegia
- Cardiac conduction defects
- Sensorineural hearing loss
- Chronic progressive external ophthalmoplegia (CPEO)
- Progressive ophthalmoparesis
- Symptomatic overlap with other mitochondrial myopathies
References
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