| A variant of autosomal dominant optic atrophy associating typical optic atrophy with other extra-ocular manifestations such as sensorineural deafness, myopathy, chronic progressive external ophthalmoplegia, ataxia and peripheral neuropathy. More rarely, other manifestations have been associated with this condition, such as spastic paraplegia, multiple-sclerosis like illness. ADOA plus is caused by mutations in the OPA1 gene (3q29), encoding a dynamin-like GTPase involved in the fusion of the inner mitochondrial membrane. The phenotypes observed in ADOA plus are thus related to mitochondrial DNA instability resulting in multiple mitochondrial DNA deletions. Transmission is autosomal dominant with variable penetrance. |
