Abstract
A 32-year-old man of Irish descent presented with severe progressive headache and sensorineural hearing loss. MRI/magnetic resonance angiography head scans were normal. A length-dependent sensorimotor peripheral neuropathy with autonomic dysfunction predated these symptoms. Systemic organ involvement and transthyretin (TTR) amyloid immunostaining of bone marrow and fat aspirate were documented. Direct DNA sequencing revealed both the normal TTT (phenylalanine) and a new variant TCT (serine) at position 44 of the TTR gene. This case expands the genotypic and phenotypic variability within TTR amyloidosis.
Publication types
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Case Reports
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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Amino Acid Sequence
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Amyloidosis / genetics*
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Amyloidosis / pathology
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Amyloidosis / physiopathology
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Base Sequence
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Exons
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Headache
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Hearing Loss, Sensorineural / genetics*
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Hearing Loss, Sensorineural / pathology
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Hearing Loss, Sensorineural / physiopathology
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Humans
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Ireland / ethnology
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Magnetic Resonance Angiography
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Magnetic Resonance Imaging
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Male
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Peripheral Nervous System Diseases / genetics*
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Peripheral Nervous System Diseases / pathology
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Peripheral Nervous System Diseases / physiopathology
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Point Mutation*
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Polymerase Chain Reaction
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Polymorphism, Single-Stranded Conformational*
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Prealbumin / chemistry
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Prealbumin / genetics*
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Serine*
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United States