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Abstract
Monozygotic twin brothers, clinically discordant for Leber's hereditary optic neuropathy (LHON), had a heteroplasmic point mutation at position 14484 in the mitochondrial DNA that was not detected in their mother. Moreover, the mutation occurred on the rare European haplogroup X, rather than the haplogroup J commonly associated with the 14484 mutation. These data indicate that the 14484 mutation in this family was a new mutation, indicating that it was the de novo occurrence of a common, primary LHON mutation.
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