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Mitochondrial diseases are a group of disorders relating to the mitochondria, the organelles that are the “powerhouses” of the eukaryotic cells that compose higher-order life-forms (including humans). The mitochondria convert the energy of food molecules into the ATP that powers most cell functions.
Mitochondrial diseases comprise those disorders that in one way or another affect the function of the mitochondria and/or are due to mitochondrial DNA. Mitochondrial diseases take on unique characteristics both because of the way the diseases are often inherited and because mitochondria are so critical to cell function. The subclass of these diseases that have neuromuscular disease symptoms are often referred to as a mitochondrial myopathy.
In addition to the Mitochondrial myopathies, other examples include:
The effects of mitochondrial disease can be quite varied. Since the distribution of defective DNA may vary from organ to organ within the body, the mutation that in one person may cause liver disease might in another person cause a brain disorder. In addition, the severity of the defect may be great or small. Some minor defects cause only “exercise intolerance”, with no serious illness or disability. Other defects can more severely affect the operation of the mitochondria and can cause severe body-wide impacts.
As a general rule, mitochondrial diseases are worse when the defective mitochondria are present in the muscles, cerebrum, or nerves,[1] because these are the most energy-hungry cells of the body.
However, even though mitochondrial disease varies greatly in presentation from person to person, several major categories of the disease have been defined, based on the most common symptoms and the particular mutations that tend to cause them.
An outstanding question and active area of research is whether ATP depletion or reactive oxygen species are in fact responsible for the observed phenotypic consequences.
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