Abstract:
BACKGROUND:Serum immunoglobulin E (IgE) level is recognized to be under strong genetic control, but the causal and susceptibility genes remain to be identified. We sought to investigate the association between single nucleotide polymorphisms (SNPs) in the Toll-like receptor (TLR) signaling pathway and total serum IgE level. METHODS:A population of 206 patients with severe chronic rhinosinusitis (CRS) was used. Precise phenotyping of patients was accomplished by means of a questionnaire and clinical examination. Blood was drawn for measurement of total serum IgE, as well as DNA extraction. A maximally informative set of SNPs in the TLR1, 2, 3, 4, 6, 9, 10, CD14, MD2, MyD88, IRAK4, and TRAF6 genes were selected and genotyped. Significant findings were replicated in a second independent population of 956 subjects from 227 families with asthma. RESULTS:A total of 97 out of 104 SNPs were successfully genotyped. Three SNPs in IRAK4--rs1461567, rs4251513, and rs4251559--were associated with total serum IgE levels (P < 0.004). In the replication sample, the same SNPs as well as the same orientation of the risk allele were associated with IgE levels (P < 0.031). CONCLUSIONS:These results demonstrate a clear association between polymorphisms in the IRAK4 gene and serum IgE levels in patients with CRS and asthma. IRAK4 may be important in the regulation of IgE levels in patients with inflammatory diseases of the airways.
journal_name
Allergyjournal_title
Allergyauthors
Tewfik MA,Bossé Y,Lemire M,Hudson TJ,Vallée-Smejda S,Al-Shemari H,Laprise C,Desrosiers Mdoi
10.1111/j.1398-9995.2008.01889.xsubject
Has Abstractpub_date
2009-05-01 00:00:00pages
746-53issue
5eissn
0105-4538issn
1398-9995pii
ALL1889journal_volume
64pub_type
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