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Functional Fcgamma receptor polymorphisms are associated with human allergy.

Jianming Wu1, Rui Lin2, Jinhai Huang2

  • 1Department of Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, Minnesota, United States of America ; Department of Medicine, University of Minnesota, Minneapolis, Minnesota, United States of America.

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Summary
This summary is machine-generated.

Functional polymorphisms in FcγRIIA and FcγRIIB genes are linked to human atopy. The FcγRIIA-131His allele offers protection, while the FcγRIIB-187Thr allele increases allergy risk.

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Area of Science:

  • Immunogenetics
  • Allergology
  • Molecular Medicine

Background:

  • Immunoglobulin G (IgG) Fc receptors (FcγRs) are crucial for immune responses.
  • The specific role of FcγRs in human asthma and allergy remains unclear.
  • Investigating genetic variations in FcγR genes (FCGR) can elucidate their involvement in allergic diseases.

Purpose of the Study:

  • To determine if functional single nucleotide polymorphisms (SNPs) in FCGR genes are associated with human asthma and allergy.
  • To analyze the association of specific FCGR SNPs with atopy, asthma, and bronchial hyper-responsiveness.

Main Methods:

  • Genotyping of functional SNPs in FCGR2A, FCGR2B, FCGR2C, FCGR3A, and FCGR3B was performed in an asthma family cohort.
  • The cohort comprised 370 atopy-positive, 239 atopy-negative, and 169 asthma-positive subjects.
  • Family-based association tests (FBAT) and logistic regression were used to analyze genotype and phenotype data.

Main Results:

  • The FcγRIIA-131His>Arg SNP (rs1801274) showed a significant association with atopy, with the FcγRIIA-131His allele demonstrating a protective effect.
  • The rare FcγRIIB-187Thr allele (rs1050501) was identified as a risk factor for atopy and elevated IgE production.
  • No significant associations were found between FCGR3A, FCGR3B, and FCGR2C variants and asthma, bronchial hyper-responsiveness, or atopy.

Conclusions:

  • Functional polymorphisms in FcγRIIA and FcγRIIB genes appear to play a role in the pathogenesis of allergy.
  • These findings highlight the importance of FcγR genetic variations in the development of allergic conditions.