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Mitochondrial myopathy literally means mitochondrial muscle disease, muscle disease caused by mitochondrial dysfunction. The mitochondrion is the primary producer of energy in nearly all cells throughout the body. The exception is mature erythrocytes (red blood cells), so that they do not use up the oxygen that they carry.
Mitochondrial membrane protein-associated neurodegeneration (MPAN) is a genetic neurodegenerative disease that causes dystonia, parkinsonism, and iron accumulation in the brain. [ 1 ] [ 2 ] It is caused by mutations to the gene C19orf12 , which has unknown function.
MELAS is a condition that affects many of the body's systems, particularly the brain and nervous system (encephalo-) and muscles (myopathy). In most cases, the signs and symptoms of this disorder appear in childhood following a period of normal development. [4]
Mitochondria. Pearson syndrome is a mitochondrial disease caused by a deletion in mitochondrial DNA (mtDNA). [3] An mtDNA is genetic material contained in the cellular organelle called the mitochondria. Depending on the tissue type, each cell contains hundreds to thousands of mitochondria. There are 2–10 mtDNA molecules in each mitochondrion.
Mitochondrial DNA depletion syndrome (MDS or MDDS), or Alper's disease, is any of a group of autosomal recessive disorders that cause a significant drop in mitochondrial DNA in affected tissues. Symptoms can be any combination of myopathic , hepatopathic , or encephalomyopathic . [ 1 ]
A mitochondrial encephalomyopathy is a form of encephalomyopathy that is associated with a mitochondrial disease. MELAS syndrome Examples include MELAS syndrome and MERRF syndrome. These conditions can sometimes present together. [1] [2] KSS is sometimes included in this category, [3] but it is not included in this category in MeSH.
Mitochondrial neurogastrointestinal encephalopathy syndrome (MNGIE) is a rare autosomal recessive mitochondrial disease. [2] It has been previously referred to as polyneuropathy, ophthalmoplegia, leukoencephalopathy, and intestinal pseudoobstruction (POLIP syndrome). [3] The disease presents in childhood, but often goes unnoticed for decades.
About 1 in 4,000 children in the United States will develop mitochondrial disease by the age of 10 years. Up to 4,000 children per year in the US are born with a type of mitochondrial disease. [44] Because mitochondrial disorders contain many variations and subsets, some particular mitochondrial disorders are very rare.