JAMA Clinical Reviews IgA Nephropathy in Adults
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Jan 26, 2026 Michelle Marie O'Shaughnessy, MB, BCh, BAO, MS, a consultant nephrologist from the University of Galway, provides clinical expertise on IgA nephropathy. She explains the disease mechanism and classic presentation. She covers who is most affected, how it is diagnosed including biopsy indications, key prognostic factors, lifestyle recommendations, and emerging targeted therapies.
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Mechanism Of IgA Nephropathy
- IgA nephropathy is an immune-mediated kidney disease driven by deposition of galactose-deficient IgA1 in glomeruli.
- This deposition triggers inflammation that causes proteinuria and eventual kidney damage.
Four‑Hit Hypothesis Explained
- The four‑hit hypothesis describes sequential steps leading to IgA nephropathy from mucosal IgA production to mesangial deposition.
- Autoantibodies form against galactose‑deficient IgA1 and immune complexes deposit, activating complement and inflammation.
Genetics Plus Environment
- Genetic factors explain a minority (~11%) of IgA nephropathy risk; environmental triggers matter greatly.
- Altered microbiome and recurrent tonsillitis or GI infections likely precipitate pathogenic IgA production.