The complement factor H R1210C mutation is associated with atypical hemolytic uremic syndrome

Area of Science:

• Genetics
• Immunology
• Molecular Biology

Background:

• Mutations in complement factor H (CFH) impair host cell protection and are linked to atypical hemolytic uremic syndrome (aHUS).
• Most aHUS-associated CFH mutations are unique, but R1210C has been found in multiple unrelated patients.
• Understanding the R1210C mutation's origin and clinical impact is crucial for aHUS research.

Purpose of the Study:

• To investigate the clinical phenotype correlations of the R1210C CFH mutation in aHUS patients.
• To determine the geographic origins and evolutionary history of the R1210C aHUS-associated mutation.
• To assess the penetrance and contributing factors of the R1210C mutation in aHUS development.

Main Methods:

• Analysis of five aHUS pedigrees and seven individual aHUS patients.
• Genotype analysis of CFH and CFHR3 polymorphisms in unrelated R1210C carriers.
• Clinical phenotype assessment of patients carrying the R1210C mutation.

Main Results:

• The clinical presentation of aHUS in R1210C mutation carriers was heterogeneous.
• 12 out of 13 affected patients with the R1210C mutation also carried other known genetic risk factors for aHUS.
• Genotype analysis suggests a single origin for the R1210C mutation, indicating it's a rare polymorphism in diverse populations.

Conclusions:

• The R1210C mutation is a common aHUS mutation with a single origin, found as a rare polymorphism globally.
• Atypical hemolytic uremic syndrome (aHUS) manifestation in R1210C carriers is influenced by additional genetic or environmental risk factors.
• The R1210C mutation serves as a model for understanding aHUS pathogenesis and the role of complement factor H in disease.