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Conditions Encyclopedia Entry 1775591525

** **Mitochondrial Myopathies** are a group of rare genetic disorders caused by mutations in the mitochondrial DNA, leading to muscle weakness, fatigue, and other systemic symptoms. **CONTENT:** ### Overview Mitochondrial Myopathies (MM) are a heterogeneous group of disorders characterized by the impaired function of the mitochondria, the energy-producing structures within cells. These disorders are caused by mutations in the mitochondrial DNA (mtDNA), which is inherited from one's mother. Mitochondrial myopathies affect various systems in the body, including the muscles, nervous system, and other organs. The symptoms of MM can vary widely, depending on the specific mutation and the affected individual. Mitochondrial myopathies are relatively rare, affecting approximately 1 in 5,000 to 1 in 10,000 people worldwide. However, the prevalence of MM is likely underestimated due to the lack of awareness and the complexity of diagnosing these disorders. The symptoms of MM can be subtle and may not become apparent until later in life, making diagnosis challenging. ### History/Background The first reported case of mitochondrial myopathy was in 1962, when a British neurologist, Dr. Keith Baraitser, described a patient with a rare disorder characterized by muscle weakness, fatigue, and other systemic symptoms. Since then, numerous cases have been reported, and the understanding of MM has evolved significantly. In the 1980s, the discovery of the mitochondrial DNA and the development of techniques to analyze mtDNA mutations led to a better understanding of the genetic basis of MM. ### Key Information Mitochondrial myopathies are caused by mutations in the mitochondrial DNA, which can occur in any of the 37 genes that code for proteins involved in energy production. The most common mutations associated with MM include: * **MELAS syndrome**: a condition characterized by muscle weakness, seizures, and other systemic symptoms. * **MERRF syndrome**: a condition characterized by muscle weakness, ataxia, and other systemic symptoms. * **KSS syndrome**: a condition characterized by muscle weakness, hearing loss, and other systemic symptoms. The symptoms of MM can vary widely, depending on the specific mutation and the affected individual. Common symptoms include: * **Muscle weakness**: weakness and wasting of muscles, particularly in the face, arms, and legs. * **Fatigue**: persistent and debilitating fatigue, even after rest. * **Headaches**: frequent and severe headaches. * **Seizures**: seizures and other neurological symptoms. * **Vision problems**: blurred vision, double vision, and other vision problems. ### Significance Mitochondrial myopathies are significant because they highlight the importance of mitochondrial function in maintaining overall health. The symptoms of MM can have a profound impact on an individual's quality of life, making it essential to diagnose and manage these disorders effectively. While there is no cure for MM, various treatments can help manage symptoms and improve quality of life. **INFOBOX:** - Name: Mitochondrial Myopathies - Type: Genetic disorder - Date: 1962 (first reported case) - Location: Worldwide - Known For: Rare genetic disorders caused by mitochondrial DNA mutations **TAGS:** Mitochondrial myopathies, genetic disorders, muscle weakness, fatigue, seizures, headaches, vision problems, mitochondrial DNA, mtDNA mutations.