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Common polymorphisms in C3, factor B, and factor H collaborate to determine systemic complement activity and disease risk

Open access
Heurich, Meike, Martínez-Barricarte, Ruben, Francis, Nigel J., Roberts, Dawn L., Rodríguez de Córdoba, Santiago, Morgan, B. Paul, Harris, Claire L.·2011·Proceedings of the National Academy of Sciences

Abstract

Common polymorphisms in complement alternative pathway (AP) proteins C3 (C3 R102G), factor B (fB R32Q), and factor H (fH V62I) are associated with age-related macular degeneration (AMD) and other pathologies. Our published work showed that fB R32Q influences C3 convertase formation, whereas fH V62I affects factor I cofactor activity. Here we show how C3 R102G(C3S/F) influences AP activity. In hemolysis assays, C3 102G activated AP more efficiently (EC 50 C3 102G: 157 nM; C3 102R: 191 nM;P< 0.0001). fB binding kinetics and convertase stability were identical, but native and recombinant fH bound more strongly to C3b 102R(KD C3b 102R: 1.0 μM; C3b 102G: 1.4 μM;P< 0.0001). Accelerated decay was unaltered, but fH cofactor activity was reduced for C3b 102G, favoring AP amplification. Combining disease “risk” variants (C3 102G, fB 32R, and fH 62V) in add-back assays yielded sixfold higher hemolytic activity compared with “protective” variants (C3 102R, fB 32Q, and fH 62I;P< 0.0001). These data introduce the concept of a functional complotype (combination of polymorphisms) defining complement activity in an individual, thereby influencing susceptibility to AP-driven disease.

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Metadata

Authors
Heurich, M., Martínez-Barricarte, R., Francis, N. J., Roberts, D. L., Rodríguez de Córdoba, S., Morgan, B. P., & Harris, C. L.
Venue
Proceedings of the National Academy of Sciences
Published
2011-05-09
Volume
108
Issue
21
Pages
8761-8766
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2131852221
Cited by
231
References
9
FWCI
8.34
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Common polymorphisms in C3, factor B, and factor H collaborate to determine systemic complement activity and disease risk. https://app.cochat.ai/papers/10.1073/pnas.1019338108
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Heurich, M., Martínez-Barricarte, R., Francis, N. J., Roberts, D. L., Rodríguez de Córdoba, S., Morgan, B. P., & Harris, C. L. (2011). Common polymorphisms in C3, factor B, and factor H collaborate to determine systemic complement activity and disease risk. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1019338108

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