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Making sense of the spectrum of glomerular disease associated with complement dysregulation
Sally Ann Johnson1, Edwin K S Wong, C Mark Taylor
1Paediatric Nephrology, Great North Children's Hospital, Newcastle Upon Tyne, UK, sally.johnson@nuth.nhs.uk.
Insights
Complement system dysregulation is implicated in glomerular diseases like atypical hemolytic uremic syndrome and C3 glomerulonephritis. This review explores their connections and proposes a hypothesis for varied disease presentations due to alternative pathway dysregulation.
Area of Science:
- Nephrology
- Immunology
- Genetics
Background:
- The complement system plays a critical role in the pathogenesis of several glomerular diseases.
- Atypical hemolytic uremic syndrome, membranoproliferative glomerulonephritis, and C3 glomerulonephritis are key examples of complement-mediated kidney diseases.
- Overlapping clinical features and shared genetic mutations are observed in patients with these conditions.
Purpose of the Study:
- To review the evidence linking complement dysregulation to specific glomerular diseases.
- To examine the clinical interconnections between atypical hemolytic uremic syndrome, membranoproliferative glomerulonephritis, and C3 glomerulonephritis.
- To propose a hypothesis explaining the diverse clinical phenotypes arising from alternative complement pathway dysregulation.
Main Methods:
- Literature review of studies on complement system involvement in glomerular diseases.
- Analysis of clinical data and genetic findings in patients with atypical hemolytic uremic syndrome, membranoproliferative glomerulonephritis, and C3 glomerulonephritis.
- Synthesis of evidence to formulate a hypothesis regarding alternative complement pathway dysregulation.
Main Results:
- Complement system activation, particularly the alternative pathway, is a common mechanism in these glomerular diseases.
- Specific complement gene mutations are associated with multiple disease phenotypes, highlighting a shared pathogenic basis.
- Clinical presentations can vary significantly despite shared underlying complement dysregulation.
Conclusions:
- Complement dysregulation is central to the pathogenesis of atypical hemolytic uremic syndrome, membranoproliferative glomerulonephritis, and C3 glomerulonephritis.
- Understanding the shared genetic and clinical features is crucial for diagnosis and management.
- The alternative complement pathway's dysregulation offers a potential unifying explanation for the variable phenotypes observed in these kidney diseases.
Abstract:
Over recent years, complement has emerged as a major player in the development of a number of glomerular diseases, including atypical haemolytic uraemic syndrome, membranoproliferative glomerulonephritis and the recently described C3 glomerulonephritis. Some patients and pedigrees show overlapping features of these conditions. Intriguingly, a few complement gene mutations are common to different disease phenotypes. In this review, we explore the evidence for complement dysregulation in these diseases and the clinical interface between them, and present a hypothesis to explain the variable phenotype associated with dysregulation of the alternative complement pathway.
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