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Journal Article
Clinical and pathological findings in familial amyloid polyneuropathy caused by a transthyretin E61K mutation.
Journal of the Neurological Sciences 2017 October 16
Familial amyloid polyneuropathy (FAP) is an autosomal dominant hereditary systemic amyloidosis caused by mutation of the transthyretin (TTR) gene, and usually shows sensory-dominant polyneuropathy and autonomic neuropathy at the initial stage. The pathogenesis of this neuropathy remains unknown, although several mechanisms, including mechanical compression, vessel occlusion, TTR toxicity and Schwann cell dysfunction have been proposed. We describe a patient with late-onset FAP caused by a TTR E61K mutation. Amyloid deposits were not detected in the endoneurium or perineurium of the sural nerve 7years after the onset of the disease, but a marked loss of nerve fibers was observed in the sural nerve. TTR-derived amyloid deposits were confirmed in the peroneus brevis muscle, salivary gland and heart tissue. DNA analysis revealed a heterozygous mutation in TTR. These findings suggest that proximal parts of the peripheral nervous system might be strongly affected by TTR aggregates or amyloid fibrils, and that the blood-nerve barrier in distal parts of peripheral nerves are initially preserved in this patient. This case indicates that several biopsy sites other than nerves may be helpful and necessary for the diagnosis of TTR amyloidosis in mild or late-onset FAP.
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