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Interleukin 9 (IL9) is involved in mast cell maturation and the enhancement of IgE production by B cells. Furthermore, linkage data in human and mice have suggested that IL9 may contribute to asthma. Since our genetic analysis of the 5q cytokine cluster did not support a genetic role for the IL9 gene, we became interested in the IL9 receptor gene (IL9R) in the pseudoautosomal region. We genotyped markers sDF2 and sDF1 close to the IL9R gene among 289 affected and 368 family-based controls. The results were studied by using linkage, transmission disequilibrium, association and homozygosity analyses. Linkage analyses remained negative, presumably because of our low power for linkage study. However, all the other analyses yielded evidence that the IL9R gene region may have a role in the development of asthma. The sDF2*10 allele was more frequently transmitted than untransmitted to asthmatic offspring (34 vs 16, pchi2 &lt; or = 0.01), and it was found homozygotic among asthma patients more often than expected (Psimul2 = 0.009). Also, a specific X chromosomal haplotype, sDF2*10-sDF1*6 associated with asthma (40 vs 7, Pchi2 &lt; 0.005, Psimul1 = 0.04).

The IL9R region contribution in asthma is supported by genetic association in an isolated population