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Complement Factor H-Related 5-Hybrid Proteins Anchor Properdin and Activate Complement at Self-Surfaces.

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Complement factor H-related 5 (CFHR5) mutations cause C3 glomerulopathy by enhancing complement activation. This discovery offers new insights into C3G pathogenesis and potential therapeutic targets for this severe kidney disease.

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Area of Science:

  • Nephrology
  • Immunology
  • Genetics

Background:

  • C3 glomerulopathy (C3G) is a severe kidney disease with no specific treatments.
  • Defective complement regulation, particularly involving the complement factor H-related (CFHR) gene cluster, is implicated in C3G.
  • Copy number variations and mutations in CFHR genes are associated with C3G.

Purpose of the Study:

  • To investigate the role of CFHR5 in C3G pathogenesis.
  • To identify the mechanism by which CFHR5 mutations contribute to kidney disease.
  • To explore potential therapeutic strategies for C3G.

Main Methods:

  • Identified CFHR5 as a pattern recognition protein binding to damaged endothelial cells and properdin.
  • Characterized the properdin-binding domains of CFHR5.
  • Analyzed mutant CFHR5 proteins (CFHR2-CFHR5Hyb and CFHR5Dup) from C3G patients.
  • Assessed complement activation in vitro and in kidney biopsies.

Main Results:

  • CFHR5 binds to damaged endothelial cells and properdin, mediating dimer formation.
  • Mutant CFHR5 proteins form multimeric complexes with enhanced binding to damaged cells and properdin.
  • Mutant CFHR5 proteins exacerbate local complement activation, leading to C3b and C5b-9 deposition.
  • In vivo evidence showed enhanced properdin and complement deposition in a patient with a CFHR2-CFHR5Hyb mutation.

Conclusions:

  • Gain-of-function mutations in CFHR5 represent a novel disease mechanism in C3G.
  • Enhanced complement activation driven by mutant CFHR5 contributes to C3G pathogenesis.
  • Understanding this mechanism is crucial for developing targeted therapies for C3G.