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Renal amyloidosis caused by apolipoprotein A-II without a genetic mutation in the coding sequence

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Abstract

Although the majority of renal amyloidosis is caused by either acquired monoclonal immunoglobulin light-chain amyloidosis or reactive systemic amyloid A, some cases are caused by hereditary amyloidosis. Apolipoprotein A-II (apoAII) amyloidosis is a rare form of hereditary amyloidosis and cannot be diagnosed by a routine examination. Thus, the prevalence and etiology of apoAII amyloidosis are uncertain. In humans, a genetic mutation in the stop codon of apoAII is considered to be a cause of amyloid fibril formation. We report on a 68-year-old man who presented with proteinuria by apoAII amyloidosis without family history. His proteinuria gradually increased to 6 g/day within 1 year. A renal biopsy showed amyloid deposition in the glomeruli, however, acquired monoclonal immunoglobulin light-chain amyloidosis and reactive systemic amyloid A were ruled out. Immunohistochemistry revealed apoAII deposition in the glomeruli, but DNA sequencing did not identify any genetic mutation in the coding sequence of apoAII. Here, we report a case of apoAII amyloidosis without a genetic mutation in the coding sequence and discuss the etiology of apoAII amyloidosis.

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Acknowledgment

We thank Shizuka Fujii for technical assistance.

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The authors have declared that no conflicts of interest exist.

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Correspondence to Ryuji Morizane.

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Morizane, R., Monkawa, T., Konishi, K. et al. Renal amyloidosis caused by apolipoprotein A-II without a genetic mutation in the coding sequence. Clin Exp Nephrol 15, 774–779 (2011). https://doi.org/10.1007/s10157-011-0483-4

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  • DOI: https://doi.org/10.1007/s10157-011-0483-4

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