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Conditions Encyclopedia Entry 1776775275

** This encyclopedia entry is about **Mitochondrial Myopathies**, a group of rare genetic disorders affecting the mitochondria, the energy-producing structures within cells. **CONTENT:** ### Overview Mitochondrial Myopathies (MM) are a group of rare genetic disorders that affect the mitochondria, the energy-producing structures within cells. These disorders are caused by mutations in the mitochondrial DNA, which is responsible for producing energy for the cell. MM can affect various parts of the body, including the muscles, nervous system, and other organs. The symptoms of MM can vary widely depending on the specific type of disorder and the severity of the mutation. Mitochondrial Myopathies are often inherited in an autosomal dominant or maternal pattern, meaning that a single copy of the mutated gene is enough to cause the disorder. In some cases, the disorder can be caused by a new mutation, which is not inherited from either parent. The diagnosis of MM is often challenging, as the symptoms can be similar to those of other conditions. A diagnosis is typically made through a combination of genetic testing, muscle biopsy, and other diagnostic tests. ### History/Background Mitochondrial Myopathies were first described in the 1960s, but it wasn't until the 1980s that the genetic basis of the disorder was understood. In 1988, a team of researchers discovered that a mutation in the mitochondrial DNA was responsible for a specific type of MM. Since then, numerous other mutations have been identified as causing MM. The understanding of MM has improved significantly over the years, and researchers are working to develop new treatments and therapies for the disorder. ### Key Information Mitochondrial Myopathies are a group of disorders that affect the mitochondria, the energy-producing structures within cells. There are several types of MM, including: * **Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like episodes (MELAS)**: a disorder that affects the brain, muscles, and other organs. * **Myoclonic Epilepsy with Ragged-Red Fibers (MERRF)**: a disorder that affects the brain and muscles. * **Kearns-Sayre Syndrome (KSS)**: a disorder that affects the muscles, heart, and other organs. * **NARP Syndrome (Neuropathy, Ataxia, and Retinitis Pigmentosa)**: a disorder that affects the nervous system, muscles, and eyes. The symptoms of MM can vary widely depending on the specific type of disorder and the severity of the mutation. Common symptoms include: * Muscle weakness and wasting * Fatigue and muscle pain * Numbness or tingling in the hands and feet * Vision loss * Hearing loss * Seizures and epilepsy * Stroke-like episodes ### Significance Mitochondrial Myopathies are a group of rare genetic disorders that affect the mitochondria, the energy-producing structures within cells. These disorders can have a significant impact on the quality of life for those affected, and can be life-threatening in some cases. Researchers are working to develop new treatments and therapies for MM, including gene therapy and other experimental treatments. **INFOBOX:** - Name: Mitochondrial Myopathies - Type: Genetic disorder - Date: 1960s (first described) - Location: Worldwide - Known For: Rare genetic disorders affecting the mitochondria **TAGS:** Mitochondrial Myopathies, Genetic disorder, Mitochondria, Energy production, Muscle weakness, Fatigue, Numbness, Vision loss, Hearing loss, Seizures, Epilepsy, Stroke-like episodes, Gene therapy, Experimental treatments.