Systematic review and meta-analysis of the association between {beta}2-adrenoceptor polymorphisms and asthma: a HuGE review.
A number of studies have investigated two common polymorphisms in the beta(2)-adrenoceptor gene, Arg/Gly16 and Gln/Glu27, in relation to asthma susceptibility. The authors performed a meta-analysis of each polymorphism, as well as haplotype analysis, for adult and pediatric populations separately, using published data, supplemented by additional data requested from the original authors. Individual analysis detected no effect of Arg/Gly16 in adults but did suggest a recessive protective effect of Gly16 for children, with an odds ratio of 0.71 (95% confidence interval (CI): 0.53, 0.96) compared with the other genotypes. Results for Gln/Glu27 in adults seem to indicate that heterozygotes are at decreased risk of asthma than either homozygote (odds ratio = 0.73, 95% CI: 0.62, 0.87), although the studies are heterogeneous; in children, the Glu/Glu genotype has a decreased risk of asthma (odds ratio = 0.60, 95% CI: 0.35, 0.99) compared with the other genotypes. Despite the proximity of these two polymorphic sites, the linkage disequilibrium coefficient of 0.41 was not high (p < 0.001). Haplotype analysis suggests that there may be an interaction between the two sites, with a lower risk of asthma associated with the Glu27 allele (compared with Gln27), and that this risk is modified by the allele at position 16.
Thakkinstian
Ammarin
A
Clinical Epidemiology Unit, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
McEvoy
Mark
M
Minelli
Cosetta
C
Gibson
Peter
P
Hancox
Bob
B
Duffy
David
D
Thompson
John
J
Hall
Ian
I
Kaufman
Joel
J
Leung
Ting-Fan
TF
Helms
Peter Joseph
PJ
Hakonarson
Hakon
H
Halpi
Eva
E
Navon
Ruth
R
Attia
John
J
D000483:Alleles; D001249:Asthma / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D011110:Polymorphism, Genetic / Q000235:genetics*; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics*; D018570:Risk Assessment
D018343:Receptors, Adrenergic, beta-2