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Related Experiment Videos

Y402H polymorphism of complement factor H affects binding affinity to C-reactive protein.

Matti Laine1, Hanna Jarva, Sanna Seitsonen

  • 1Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Haartmaninkatu 3, FI-00014 Helsinki, Finland.

Journal of Immunology (Baltimore, Md. : 1950)
|March 7, 2007
PubMed
Summary

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The Y402H polymorphism in complement factor H (FH) impairs its binding to C-reactive protein (CRP). This may reduce cellular debris clearance and increase inflammation in age-related macular degeneration.

Area of Science:

  • Ophthalmology
  • Immunology
  • Genetics

Background:

  • Complement factor H (FH) regulates the alternative complement pathway.
  • A Y402H polymorphism in FH is linked to age-related macular degeneration (AMD).

Purpose of the Study:

  • To investigate the functional impact of the FH Y402H polymorphism on FH's interaction with C-reactive protein (CRP).

Main Methods:

  • Purified FH from AMD patients (FH(402H)) and controls (FH(402Y)) were analyzed.
  • Binding assays were performed using FH variants and CRP.
  • Recombinant FH fragments with the Y402H substitution were also tested.

Main Results:

  • FH purified from individuals with the FH(402H) variant showed significantly reduced binding to CRP compared to FH(402Y).

Related Experiment Videos

  • A recombinant FH fragment with the Y402H change also exhibited strongly reduced CRP binding.

    • Conclusions:

    • The FH Y402H polymorphism impairs FH binding to CRP.
    • This reduced interaction may compromise the clearance of cellular debris and promote inflammation in the macula, contributing to AMD pathogenesis.