CPEO was familial in 28% of our patients. There are three different modes of inheritance: (i) maternal transmission associated with mitochondrial point mutations as it is known for other mitochondrial disorders, (ii) autosomal recessive, and (iii) autosomal dominant inheritance. In contrast to sporadic cases with single mitochondrial deletions autosomal inheritance can be associated with multiple deletions of mitochondrial DNA. They are due to so far unknown nuclear mutations.
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