Abstract
Background
Proliferative glomerulonephritis with monoclonal IgG deposits (PGNMID) is a glomerular disease defined by non-organized glomerular deposits of heavy and light chain–restricted immunoglobulin and is rarely reported in children.
Methods
We characterized a series of nine pediatric patients from two academic centers with biopsy-proven PGNMID and additionally describe two patients with monotypic IgG in the setting of IgM deposition.
Results
Each patient presented with hematuria and/or proteinuria; however, only five had elevated serum creatinine. Prodromal or concurrent infection was identified in six patients, low C3 in five, and alternate complement pathway gene variants in two. No monoclonal serum proteins were identified in five tested patients. Seven patients had monotypic deposits composed of IgG3-λ, two showed IgG3-κ, and one each IgG1 and IgG3 with lambda dominance in the setting of IgM deposition. The glomerular pattern was predominantly mesangial proliferative or membranoproliferative glomerulonephritis (MPGN). Treatment and outcomes were variable; four patients have recent PGNMID diagnoses and therefore minimal follow up, one had relatively stable kidney function for over a decade, and six experienced kidney failure, with four receiving transplants. Recurrent deposits of the same isotype were identified in five of six transplanted kidneys, corresponding to three of four transplanted patients. One of these patients developed PGNMID recurrences in three separate kidney allografts over a 20-year disease course.
Conclusions
Our study emphasizes the need for upfront IgG subclass investigation in pediatric mesangial or MPGN with IgG deposition and monotypic or biased light-chain staining. Furthermore, this pediatric experience suggests expanded pathogenic considerations in PGNMID.
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Data availability
Detailed histopathologic data from all biopsies are provided as supplementary table (online resource 1).
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Megan Troxell, Neeraja Kambham, Colin Lenihan, and Cynthia Nast contributed to the study conception and design. All the authors contributed to the data collection. Data tabulation and analysis was performed by Paul Miller, Andrew Xiao, Vanderlene Kung, and Megan Troxell. The first draft of the manuscript was written by Paul Miller, Andrew Xiao, and Megan Troxell. All the authors commented on previous versions of the manuscript. All the authors read and approved the final manuscript.
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Dr. Amanda Uber is a Paul and Yuanbi Ramsay Endowed Fellow, Maternal and Child Health Research Institute at Stanford.
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This study received Institutional Review Board approval at Stanford and Cedars-Sinai, and was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
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Miller, P., Xiao, A.Y., Kung, V.L. et al. Progression of proliferative glomerulonephritis with monoclonal IgG deposits in pediatric patients. Pediatr Nephrol 36, 927–937 (2021). https://doi.org/10.1007/s00467-020-04763-5
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DOI: https://doi.org/10.1007/s00467-020-04763-5