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  • Title: Lipoprotein glomerulopathy with a novel apolipoprotein E variant, APOE Kanto (Asp 151dup).
    Author: Yokochi A, Matsunaga A, Kanemoto K, Tominaga N, Uda S, Saito T.
    Journal: CEN Case Rep; 2024 Aug 14; ():. PubMed ID: 39141311.
    Abstract:
    A 33-year-old Japanese man was admitted for possible kidney disease because of massive proteinuria. Laboratory findings were characterized by marked urinary protein of 4.7 g/day and high-serum triglyceride levels of 266 mg/dL. Renal biopsy revealed segmental proliferation in the mesangium and lipoprotein thrombi in the glomerular capillary. These results suggested that the diagnosis was lipoprotein glomerulopathy (LPG), although serum apolipoprotein E (apo E) levels were within normal ranges. The APOE phenotype was identified as E2/3 by isoelectric focusing polyacrylamide gel electrophoresis. Direct DNA sequencing analyses for apo E identified a duplication of amino acid 151, aspartic acid, and the gene mutation was named APOE Kanto. APOE gene mutations due to amino acid duplication are rare, and this is the first report showing that amino acid duplication among apo E gene mutations is involved in LPG. It is also noteworthy that the patient developed end-stage kidney disease after over than 10 years despite fibrate treatment.
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