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1 patient data entry collated from reference Aitken et al, 2009.

allele 1allele 2
Clinical representationSymptomsAge groupPatient ageAge of onsetAge of death
Progressively blurred vision, diplopia, and longstanding bilateral ptosis (adPEO). She described occasional choking episodes after eating as well as fatigue and shortness of breath after minimal exertion. Lower limb examination revealed symmetric proximal limb weakness with reduced reflexes and flexor plantars. Tan- dem gait was hesitant. The initial differential diagnosis included Graves thyroid eye disease, a neuromuscular junction disor- der (myasthenia gravis or botulism), oculopharyngeal muscular dystrophy, Miller Fisher variant of Guillain-Barre syndrome, and progressive muscular dystrophy. Borderline myopathy. The muscle biopsy showed 13% cytochrome c ox- idase (COX)–deficient fibers, significant numbers of ragged red fibers but no excess of lipid or glycogen accumulation, and subsarcolemmal accumulation of abnormal mitochondria suggestive of a mitochondrial cytopathy. The patient presented 10 months later with an un- pleasant “jumping” sensation in her feet when at rest which was relieved by movement. Symptoms were worse at night and she also described sudden involuntary movements of her lower limbs (restless legs syndrome, RLS).
-ragged red fibers

1-5 pathogenic cluster assignment of mutations. Mutations displayed without a superscript number are outside of the assigned pathogenic clusters. See cluster definitions for details.

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