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  • This syndrome has characteristics of adult-onset severe sensory ataxic neuropathy, dysarthria and chronic progressive external ophthalmoplegia. The prevalence is unknown. Other common features include progressive gait unsteadiness, absent deep tendon reflexes, the presence of Romberg\'s sign, a decreased sense of vibration and proprioception and detection of red ragged fibers on muscle biopsy. The syndrome is associated with mitochondrial DNA mutations in either the POLG1 or TWINKLE genes.
  • This syndrome has characteristics of adult-onset severe sensory ataxic neuropathy, dysarthria and chronic progressive external ophthalmoplegia. The prevalence is unknown. Other common features include progressive gait unsteadiness, absent deep tendon reflexes, the presence of Romberg\'s sign, a decreased sense of vibration and proprioception and detection of red ragged fibres on muscle biopsy. The syndrome is associated with mitochondrial DNA mutations in either the POLG1 or TWINKLE genes.
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