title: Cyclooxygenase-1 gene polymorphisms in patients with different asthma phenotypes and atopy.
abstract: Cyclooxygenase-1 (COX-1) regulates the biosynthesis of prostaglandins, which are important mediators in asthma. The possible association of COX-1 gene polymorphisms with asthma has not been investigated. The allele frequencies of 20 COX-1 polymorphisms were determined in a random Australian Caucasian population using MassARRAY technology. Informative and potentially functional promoter (c.8592C > T, c.1676C > T) and coding region (c.22C > T, c.50C > T) polymorphisms were investigated in carefully phenotyped patients with mild (n = 316), moderate (n = 241), severe (n = 86) or aspirin-intolerant asthma (AIA) (n = 58), and in nonasthmatic subjects (n = 477). There were no allelic, genotypic or haplotypic associations between these four polymorphisms and asthma or asthma severity. Over-representation of the c.50TT genotype among AIA patients (3.4%) compared with aspirin-tolerant patients (0.8%), and a global haplotype association with AIA did not reach statistical significance. The c.22TT genotype was less frequent among atopic (0.1%) rather than nonatopic individuals (1.2%; odds ratio = 9.05, 95% confidence interval 1.01-81.29). In conclusion, the present investigation of cyclooxygenase-1 polymorphisms in asthma indicates that they do not appear to play a substantial role in genetic pre-disposition for asthma or asthma severity. However, the c.22TT genotype confers a small protective effect against atopy. Potential associations with aspirin-intolerant asthma were identified and warrant further investigation in a larger population of aspirin-intolerant asthma patients.
authors.affiliation: Cooperative Research Centre for Asthma, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Shi
authors.forename: N L A
authors.initials: NL
authors.lastname: Misso
authors.forename: D L
authors.initials: DL
authors.lastname: Duffy
authors.forename: B
authors.initials: B
authors.lastname: Bradley
authors.forename: R
authors.initials: R
authors.lastname: Beard
authors.forename: P J
authors.initials: PJ
authors.lastname: Thompson
authors.forename: M-A
authors.initials: MA
authors.lastname: Kedda
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001241:Aspirin / Q000009:adverse effects; D001249:Asthma / Q000139:chemically induced / Q000235:genetics*; D001315:Australia; D051545:Cyclooxygenase 1 / Q000235:genetics*; D016861:Cyclooxygenase Inhibitors / Q000009:adverse effects; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D011110:Polymorphism, Genetic / Q000235:genetics*; D012720:Severity of Illness Index; D044465:White People / Q000235:genetics*
chemical_list: D016861:Cyclooxygenase Inhibitors; D051545:Cyclooxygenase 1; D001241:Aspirin