Variation in CFHR3 determines susceptibility to meningococcal disease by controlling factor H concentrations

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Abstract

Neisseria meningitidis protects itself from complement-mediated killing by binding complement factor H (FH). Previous studies associated susceptibility to meningococcal disease (MD) with variation in CFH, but the causal variants and underlying mechanism remained unknown. Here we attempted to define the association more accurately by sequencing the CFH-CFHR locus and imputing missing genotypes in previously obtained GWAS datasets of MD-affected individuals of European ancestry and matched controls. We identified a CFHR3 SNP that provides protection from MD (rs75703017, p value = 1.1 × 10−16) by decreasing the concentration of FH in the blood (p value = 1.4 × 10−11). We subsequently used dual-luciferase studies and CRISPR gene editing to establish that deletion of rs75703017 increased FH expression in hepatocyte by preventing promotor inhibition. Our data suggest that reduced concentrations of FH in the blood confer protection from MD; with reduced access to FH, N. meningitidis is less able to shield itself from complement-mediated killing.

Original languageEnglish
Pages (from-to)1680-1691
Number of pages12
JournalAmerican Journal of Human Genetics
Volume109
Issue number9
DOIs
Publication statusPublished - 1 Sept 2022

Keywords

  • CFH
  • CFHR3
  • Complement
  • factor H
  • Factor H-related protein
  • genotyping
  • in-depth sequencing
  • infectious disease
  • Meningococcal disease
  • Neisseria meningitidis

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