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A rare genetic axonal peripheral sensorimotor neuropathy with an X-linked recessive inheritance pattern and the neonatal to early childhood-onset of severe, slowly progressive, distal muscle weakness and atrophy (in particular of the peroneal group) as well as sensory impairment (with the lower extremities being more affected than the upper extremities), pes cavus, areflexia and hammertoes. Sensorineural hearing loss and cognitive impairment may also be associated. Females are asymptomatic and do not display the phenotype. The disease is caused by mutation in the AIFM1 gene on chromosome Xq26.
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