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Keywords:

  • asthma;
  • atopy;
  • genetics;
  • Japanese;
  • chromosome 16;
  • IL-4 receptor;
  • TDT

Background

Susceptibility to the development of atopic diseases is known to involve genetic factors. Several investigators have reported the interleukin-4 (IL-4) receptor α gene to be involved in the development of atopy. Recent study has shown that the R allele of a polymorphism in the IL-4 receptor α chain gene (Q576R) to be associated with atopy.

Objective

The objective of this study was to evaluate the possible role of the IL-4 receptor α gene; in modulating allergic response and asthma in the Japanese population.

Methods

We conducted linkage analysis using microsatellite markers flanking the IL-4 α receptor gene in 82 families ascertained through asthmatic children. The IL-4 receptor Q576R polymorphism was also genotyped by PCR-restriction fragment length polymorphism analysis.

Results

We did not find evidence for linkage of the asthma and atopy phenotypes with the markers D16S298 and D16S403 (P = 0.10 and P = 0.56, respectively, for the atopy phenotype and P = 0.17 and P = 0.60, respectively, for the asthma phenotype). The IL-4 receptor R576 allele was not preferentially transmitted to atopy- or asthma-affected children (χ2 = 1.67, P = 0.24 for atopy and χ2 = 0.91, P = 0.40 for asthma). In addition, the prevalence of the R576 allele among parents with and without atopy was similar, 20 of 81 (24.7%) parents with atopy and 22 of 77 (28.6%) parents without atopy.

Conclusion

Our findings indicate that the IL-4 receptor α gene does not exert a substantial influence on the inheritance of atopy or asthma in this Japanese population.