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Coding and Noncoding Variants in CFH Act Synergistically for Complement Activation in Immunoglobulin A Nephropathy.

Wei-Yi Guo1, Qing-Zhen Liu2, Li Zhu1

  • 1Department of Medicine, Peking University First Hospital, Beijing, China; Peking University Institute of Nephrology, Beijing, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, China.

The American Journal of the Medical Sciences
|September 17, 2018
PubMed
Summary

Genetic variants in the complement factor H (CFH) gene, specifically rs6677604 and rs800292, synergistically influence complement activation. This combined effect increases susceptibility to immunoglobulin A nephropathy (IgAN).

Keywords:
Complement activationComplement factor HGenetic variantsImmunoglobulin A nephropathy

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Area of Science:

  • Nephrology
  • Immunology
  • Genetics

Background:

  • Immunoglobulin A nephropathy (IgAN) involves complement activation in circulation and kidneys.
  • A genome-wide association study identified the complement factor H (CFH) gene locus at 1q32 as associated with IgAN susceptibility.

Purpose of the Study:

  • To investigate the combined genetic effects of coding and noncoding variants in CFH (rs6677604 and rs800292) on complement activation in IgAN.
  • To determine the association of these variants with IgAN susceptibility.

Main Methods:

  • Recruited 1,194 IgAN patients and 900 healthy controls from the Beijing Discovery Cohort.
  • Extracted genotyping data for rs800292 and rs6677604 from genome-wide association study data.
  • Collected plasma C3 levels and mesangial C3 deposit data from medical records.

Main Results:

  • The rs800292-GG genotype was linked to lower plasma C3 levels, while rs6677604-GG was associated with higher glomerular C3 deposits in IgAN patients.
  • Patients with both risk genotypes (rs800292-GG and rs6677604-GG) exhibited significantly higher complement activation.
  • Combined effects of rs800292 and rs6677604 showed a stronger association with IgAN susceptibility compared to individual variants.

Conclusions:

  • Both coding and noncoding variants in the CFH gene act synergistically to regulate complement activation.
  • These synergistic effects contribute to the overall susceptibility to immunoglobulin A nephropathy.