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Atypical Anti-Glomerular Basement Membrane Disease.
Joyita Bharati1,2, Yihe Yang3, Purva Sharma2
1Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
Kidney International Reports
|June 7, 2023
Summary
Atypical anti-glomerular basement membrane (anti-GBM) disease presents differently from classic anti-GBM disease, often with milder symptoms and varied pathology. Evaluation requires sensitive techniques to detect diverse autoantibodies, even when conventional assays are negative.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Atypical anti-glomerular basement membrane (anti-GBM) disease is defined by linear IgG deposition on the GBM without detectable circulating antibodies.
- It presents with a more heterogeneous pathological pattern and potentially milder clinical course compared to classic anti-GBM disease.
Purpose of the Study:
- To review the recent literature on atypical anti-GBM disease.
- To highlight the diagnostic challenges and evolving understanding of this condition.
Main Methods:
- Review of recent scientific literature on atypical anti-GBM disease.
- Discussion of diagnostic approaches, including conventional and modified assays.
Main Results:
- Atypical anti-GBM disease lacks a single well-defined target antigen and autoantibody type.
- Circulating antibodies may be undetectable by standard assays due to subclass restriction (e.g., IgG4), monoclonal nature, or different target antigens.
- IgA- and IgM-mediated anti-GBM disease and cases with no identifiable antibodies are recognized.
Conclusions:
- Extensive evaluation using sensitive techniques and modified assays is crucial for diagnosing atypical anti-GBM disease.
- Understanding the diverse autoantibody profiles and antigens is key to improving diagnosis and management.
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