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Glomerulonephritis in a patient with complement factor I deficiency
S Sadallah1, F Gudat, J A Laissue
1Medizinische Klinik B, University Basel, Basel, Switzerland. sadallah@ubaclu.unibas.ch
Summary
Complement factor I deficiency causes recurrent infections and, in this case, led to glomerulonephritis. This suggests a link between complement system dysregulation and kidney disease, highlighting the role of complement receptor 1.
Area of Science:
- Immunology
- Nephrology
Background:
- Complement factor I deficiency is linked to recurrent pyogenic infections.
- The complement system plays a crucial role in immune response and tissue homeostasis.
Observation:
- A patient with factor I deficiency experienced recurrent infections, vasculitis, and later developed progressive kidney disease.
- Renal biopsy revealed focal segmental glomerulonephritis with immunoglobulin and complement deposits.
- Glomerular podocytes and erythrocytes showed significantly reduced complement receptor 1 (CR1) expression.
Findings:
- Factor I deficiency leads to uncontrolled alternative complement pathway activation.
- Depletion of complement components like C3 predisposes to infections.
- Reduced CR1 expression on podocytes and erythrocytes suggests CR1 consumption due to factor I deficiency.
Implications:
- This is the first report linking factor I deficiency to glomerulonephritis.
- Uncontrolled complement activation may contribute to the development of nephritis.
- Understanding this pathway may offer new therapeutic targets for complement-mediated kidney diseases.