Complement factor H related proteins (CFHRs)
Christine Skerka1, Qian Chen, Veronique Fremeaux-Bacchi
1Department of Infection Biology, Leibniz Institute for Natural Product Research and Infection Biology, Jena, Germany. christine.skerka@hki-jena.de
Insights
Factor H related proteins (CFHRs) bind C3b and are implicated in diseases like aHUS and C3 glomerulopathies. Understanding CFHR gene variations and protein interactions is crucial for diagnosing and treating complement-associated kidney diseases.
Area of Science:
- Immunology
- Genetics
- Nephrology
Background:
- Factor H related proteins (CFHR1-5) are plasma proteins that bind C3b.
- Genetic variations in CFHR genes are linked to diseases such as atypical hemolytic uremic syndrome (aHUS) and C3 glomerulopathies (C3GN, DDD, CFHR5 nephropathy).
- The exact roles of individual CFHR proteins in complement regulation and disease pathogenesis remain incompletely understood.
Purpose of the Study:
- To review current knowledge on CFHR genes and proteins.
- To elucidate the function of CFHR proteins in complement activation.
- To understand the contribution of CFHR proteins to complement-associated diseases.
Main Methods:
- Literature review of recent publications on CFHR genes and proteins.
- Analysis of genetic abnormalities within the CFHR gene locus.
- Investigation of CFHR protein homo- and heterodimerization.
Main Results:
- CFHR proteins are involved in complement regulation through C3b binding.
- Genetic abnormalities can lead to hybrid CFHR proteins with impaired functions.
- CFHR protein interactions, including dimerization, are critical for their function.
Conclusions:
- CFHR proteins play a significant role in complement system regulation.
- Dysfunctional CFHR proteins, arising from genetic alterations, contribute to various kidney diseases.
- Further research into CFHR proteins is essential for understanding complement-mediated pathologies.
Abstract:
Factor H related proteins comprise a group of five plasma proteins: CFHR1, CFHR2, CFHR3, CFHR4 and CFHR5, and each member of this group binds to the central complement component C3b. Mutations, genetic deletions, duplications or rearrangements in the individual CFHR genes are associated with a number of diseases including atypical hemolytic uremic syndrome (aHUS), C3 glomerulopathies (C3 glomerulonephritis (C3GN), dense deposit disease (DDD) and CFHR5 nephropathy), IgA nephropathy, age related macular degeneration (AMD) and systemic lupus erythematosus (SLE). Although complement regulatory functions were attributed to most of the members of the CFHR protein family, the precise role of each CFHR protein in complement activation and the exact contribution to disease pathology is still unclear. Recent publications show that CFHR proteins form homo- as well as heterodimers. Genetic abnormalities within the CFHR gene locus can result in hybrid proteins with affected dimerization or recognition domains which cause defective functions. Here we summarize the recent data about CFHR genes and proteins in order to better understand the role of CFHR proteins in complement activation and in complement associated diseases.
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