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C3 glomerulonephritis and CFHR5 nephropathy.

Daniel P Gale¹, Patrick H Maxwell

¹Centre for Nephrology, Division of Medicine, University College London, London, UK. d.gale@ucl.ac.uk

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association

|November 6, 2012

Summary

Complement dysregulation causes kidney disease like C3 glomerulonephritis (C3GN). Genetic studies reveal key proteins involved, offering potential therapeutic targets for C3GN and other kidney disorders.

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Area of Science:

Nephrology
Immunology
Genetics

Background:

Complement system plays a crucial role in host defense against infection.
Dysregulation of complement activation and control can lead to kidney diseases, notably C3 glomerulonephritis (C3GN).
C3GN involves abnormal deposition of complement proteins (without immunoglobulins) in the kidney glomeruli.

Purpose of the Study:

To elucidate the molecular causes of C3 glomerulonephritis (C3GN).
To identify key proteins involved in protecting the kidney from complement-mediated damage.
To explore the therapeutic potential of manipulating the complement pathway for kidney diseases.

Main Methods:

Studies of single cases and families to gather genetic evidence.
Analysis of complement regulatory proteins.
Investigation of the genetic basis of C3GN and related glomerular disorders.

Main Results:

Identified complement factor H-related 5 (CFHR5) nephropathy as the most frequent cause of C3GN, particularly in Greek Cypriots.
Genetic evidence links complement regulators to the development of common glomerular diseases like IgA nephropathy and lupus nephritis.
Established the feasibility of therapeutic interventions targeting the complement pathway.

Conclusions:

Disordered complement regulation is a significant factor in kidney disease pathogenesis.
Understanding the genetic underpinnings of C3GN provides insights into broader glomerular disorders.
Targeting the complement pathway presents a promising therapeutic strategy for C3GN and potentially other kidney diseases.