Level of heteroplasmy for the mitochondrial mutation A3243G correlates with age at onset of diabetes and deafness

Human Mutation
C OlssonU Landegren

Abstract

The mitochondrial mutation A3243G has been shown to be associated with a syndrome of diabetes mellitus and sensorineural hearing loss. Using a solid-phase-based sequencing method we have investigated the relation between the proportion of mutant mitochondrial genomes and the time of disease onset among members of three families where the mutation segregates. A striking association was observed between the level of heteroplasmy and time of onset of disease, particularly hearing loss. Accordingly, this syndrome shares features of diseases caused by dynamic mutations in that variable transmission of the level of heteroplasmy between generations influences disease severity.

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