Association of IL1A, IL1B, and TNF gene polymorphisms with chronic rhinosinusitis with and without nasal polyposis: A replication study.
OBJECTIVE
To replicate and extend recent findings in a Turkish population of associations between chronic rhinosinusitis (CRS) with nasal polyposis and single-nucleotide polymorphisms (SNPs) in the IL1A (rs17561 and Ser114Ala), IL1B (rs16944), and TNF (rs361525 and rs1800629) genes.


METHODS
In a case-control replication study, DNA samples were obtained from 206 patients with severe CRS (cases) and from 196 postal code-matched controls. For IL1A and TNF, the 3 reported SNPs were complemented with tagging SNPs using an International HapMap genotyping data set to ensure complete genetic coverage. For IL1B, only the single reported SNP was assessed. A total of 24 SNPs (7 in IL1A, 1 in IL1B, and 16 in TNF) were individually genotyped. The PLINK software package was used to perform genetic association tests.


METHODS
Academic research.


METHODS
Canadian population of individuals with severe CRS.


METHODS
Allelic differences between cases and controls.


RESULTS
Significant allelic differences between cases and controls were obtained for IL1A rs17561 (odds ratio [OR], 1.48; P = .02). The following 3 additional SNPs in this gene were associated with CRS: rs2856838 (OR, 0.63; P = .003), rs2048874 (OR, 0.57; P = .01), and rs1800587 (OR, 1.49; P = .02). These 3 SNPs remained significant after correction for multiple testing. No association was found with IL1B or TNF.


CONCLUSIONS
We replicated the previously reported association between the IL1A polymorphism and severe CRS and identified 3 potential new associations in the same gene. This further supports the potential contribution of IL1A to the development of CRS. We were unable to replicate previous reports of associations with IL1B or TNF.
Mfuna Endam
Leandra
L
Department of Otolaryngology, Centre de Recherche du Centre Hospitalier de l'Université de Montréal Hôtel-Dieu, Canada.
Cormier
Chantale
C
Bossé
Yohan
Y
Filali-Mouhim
Abdelali
A
Desrosiers
Martin
M
D000328:Adult; D000368:Aged; D002170:Canada; D016022:Case-Control Studies; D002908:Chronic Disease; D005260:Female; D006801:Humans; D053582:Interleukin-1alpha / Q000235:genetics*; D053583:Interleukin-1beta / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009298:Nasal Polyps / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D012220:Rhinitis / Q000235:genetics*; D012852:Sinusitis / Q000235:genetics*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
D053582:Interleukin-1alpha; D053583:Interleukin-1beta; D014409:Tumor Necrosis Factor-alpha