20 years of human mtDNA pathologic point mutations: carefully reading the pathogenicity criteria.

Abstract excerpt

Despite the strong purifying selection that occurs during embryonic development, the particular location and features of mitochondrial DNA make it especially susceptible to accumulating point mutations, giving rise to a large number of mitochondrial DNA variants. Many of these will have moderate or no phenotypic effects but others will be the cause of very dramatic diseases, usually known as mitochondriopathies....

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