title: Intercellular adhesion molecule-1 and childhood asthma.
abstract: We investigated the role of intercellular adhesion molecule-1 in childhood asthma by examining associations of functional variants at codons 29 (A --> T), 241 (G --> A), and 469 (A --> G) in Children's Health Study participants. Among African-Americans, 469G carriers had lower risk for asthma (ever asthma OR = 0.4, 95% CI 0.2-0.9) but increased risk among 29T carriers (early onset active asthma OR = 2.2, 95% CI 1.0-4.9). Protective associations with the 241A allele were observed among non-Hispanic and Hispanic whites (ever asthma OR = 0.7, 95% CI 0.6-0.9; early onset active asthma OR = 0.5, 95% CI 0.4-0.8), and these associations were not confounded by population stratification. To gauge the potential impact of confounding by population stratification, we performed analyses by ethnic group and in an independent family-based sample. Regional associations were stable across analyses. Haplotype associations of the four common haplotypes (29A/241G/469A, AGG, TGA, and AAG) with asthma showed that Hispanics with the AAG haplotype had lower asthma risk compared to carriers of two copies of AGA haplotype (OR = 0.6, 95% CI 0.4-0.9). Among non-Hispanic whites, the AAG haplotype was associated with reduced risk for active asthma. For African-Americans, who had a low frequency of the AAG haplotype, carrying one copy of the AGG haplotype was associated with a lower risk of asthma (OR = 0.3, 95% CI 0.1-0.8), as compared with two copies of the AGA haplotype. Consistent with information on variant function, the 241A and 469G variants may indicate haplotypes that are associated with reduced risk for asthma.
authors: Department of Preventive Medicine, Keck School of Medicine, University of Southern California, CHP 236, Los Angeles, CA 90033, USA.
authors: Yu-Fen
authors: YF
authors: Li
authors: Yo-Hsuang
authors: YH
authors: Tsao
authors: W James
authors: WJ
authors: Gauderman
authors: David V
authors: DV
authors: Conti
authors: Edward
authors: E
authors: Avol
authors: Louis
authors: L
authors: Dubeau
authors: Frank D
authors: FD
authors: Gilliland
mesh_terms: D000293:Adolescent; D001741:Black or African American / Q000235:genetics; D001249:Asthma / Q000208:ethnology / Q000235:genetics*; D002648:Child; D003062:Codon / Q000235:genetics; D015331:Cohort Studies; D005260:Female; D014644:Genetic Variation; D006239:Haplotypes; D006630:Hispanic or Latino / Q000235:genetics; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics*; D008297:Male; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors
chemical_list: D003062:Codon; D018799:Intercellular Adhesion Molecule-1