Molecular Basis of Factor H R1210C Association with Ocular and Renal Diseases

J Am Soc Nephrol. 2016 May;27(5):1305-11. doi: 10.1681/ASN.2015050580. Epub 2015 Sep 16.

Abstract

The complement factor H (FH) mutation R1210C, which was described in association with atypical hemolytic uremic syndrome (aHUS), also confers high risk of age-related macular degeneration (AMD) and associates with C3 glomerulopathy (C3G). To reveal the molecular basis of these associations and to provide insight into what determines the disease phenotype in FH-R1210C carriers, we identified FH-R1210C carriers in our aHUS, C3G, and AMD cohorts. Disease status, determined in patients and relatives, revealed an absence of AMD phenotypes in the aHUS cohort and, vice versa, a lack of renal disease in the AMD cohort. These findings were consistent with differences in the R1210C-independent overall risk for aHUS and AMD between mutation carriers developing one pathology or the other. R1210C is an unusual mutation that generates covalent complexes between FH and HSA. Using purified FH proteins and surface plasmon resonance analyses, we demonstrated that formation of these FH-HSA complexes impairs accessibility to all FH functional domains. These data suggest that R1210C is a unique C-terminal FH mutation that behaves as a partial FH deficiency, predisposing individuals to diverse pathologies with distinct underlying pathogenic mechanisms; the final disease outcome is then determined by R1210C-independent genetic risk factors.

Keywords: complement; glomerular disease; hemolytic uremic syndrome.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Atypical Hemolytic Uremic Syndrome / genetics*
  • Complement C3*
  • Complement Factor H / genetics
  • Female
  • Humans
  • Kidney Diseases / genetics*
  • Kidney Glomerulus*
  • Macular Degeneration / genetics*
  • Male
  • Middle Aged
  • Mutation*
  • Pedigree

Substances

  • Complement C3
  • complement factor H, human
  • Complement Factor H