Article ; Online: Monoclonal Immunoglobulin Crystalline Membranous Nephropathy.
American journal of kidney diseases : the official journal of the National Kidney Foundation
2024
Abstract: Monoclonal immunoglobulin (MIg) crystalline nephropathies are rare lesions resulting from precipitation of MIgs in the kidney as intracellular or extracellular crystals. We describe a patient with multiple myeloma (IgGλ) and diabetes who presented with ... ...
Abstract | Monoclonal immunoglobulin (MIg) crystalline nephropathies are rare lesions resulting from precipitation of MIgs in the kidney as intracellular or extracellular crystals. We describe a patient with multiple myeloma (IgGλ) and diabetes who presented with nephrotic range proteinuria. Kidney biopsy revealed membranous nephropathy superimposed on diabetic glomerulosclerosis. Glomeruli were negative for PLA2R, THSD7A, and NELL-1. Ultrastructurally, the subepithelial deposits were composed of crystals (ranging from rhomboid to rod to needle shaped), which failed to stain for immunoglobulins by routine immunofluorescence but stained for IgG+λ by paraffin immunofluorescence after pronase digestion. RNA-based immunoglobulin repertoire sequencing performed on bone marrow aspirate identified an IgGλ (γ1) clone, which was highly atypical, combining an extensively mutated (23.6%) Ig heavy chain derived from the IGHV1-24 with low pI and unusual mutations and a light chain derived from an extremely rare germline gene (IGLV10-54). This report expands the pathologic spectrum of MIg crystalline nephropathies by describing a unique case of crystalline nephropathy with IgGλ deposits manifesting as membranous nephropathy. |
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Language | English |
Publishing date | 2024-01-23 |
Publishing country | United States |
Document type | Case Reports |
ZDB-ID | 604539-x |
ISSN | 1523-6838 ; 0272-6386 |
ISSN (online) | 1523-6838 |
ISSN | 0272-6386 |
DOI | 10.1053/j.ajkd.2023.11.011 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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