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Journal Article
Review
Autosomal disorders of mitochondrial DNA maintenance.
Acta Neurologica Belgica 2006 June
Mitochondrial DNA (mtDNA) is maternally inherited. After birth, secondary mtDNA defects can arise. MtDNA depletion is a reduction in the amount of mtDNA in particular tissues. Multiple deletions of mtDNA accumulate as somatic mutations in mainly postmitotic tissues. These disorders of mtDNA maintenance frequently show Mendelian inheritance. Positional cloning has identified several genes involved in the control of mtDNA stability. Recessive mutations in the genes ECGF1, dGK, TK2, SUCLA2 and POLG cause mtDNA depletion syndromes (MDS). Generally, MDS has infantile onset tissue specific features. Mutations in the genes ECGF1, ANT1, C10orf2 and POLG are associated with multiple mtDNA deletions. The nature of these mutations is dominant in ANT1, C10orf2 and POLG and recessive in ECGF1, C10orf2 and POLG. Mutations in these genes frequently cause progressive external ophthalmoplegia (PEO). However clinical heterogeneity results in different neurological syndromes with considerable overlap. The most common features are PEO, neuropathy, myopathy, ataxia, epilepsy and hepatopathy.
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