title: Transferability of genome-wide associated loci for asthma in African Americans.
abstract: Transferability of significantly associated loci or GWAS "hits" adds credibility to genotype-disease associations and provides evidence for generalizability across different ancestral populations. We sought evidence of association of known asthma-associated single nucleotide polymorphisms (SNPs) in an African American population.
  
  
  
  Subjects comprised 661 participants (261 asthma cases and 400 controls) from the Howard University Family Study. Forty-eight SNPs previously reported to be associated with asthma by GWAS were selected for testing. We adopted a combined strategy by first adopting an "exact" approach where we looked-up only the reported index SNP. For those index SNPs missing form our dataset, we used a "local" approach that examined all the regional SNPs in LD with the index SNP.
  
  
  
  Out of the 48 SNPs, our cohort had genotype data available for 27, which were examined for exact replication. Of these, two SNPs were found positively associated with asthma. These included: rs10508372 (OR = 1.567 [95%CI, 1.133-2.167], P = 0.0066) and rs2378383 (OR = 2.147 [95%CI, 1.149-4.013], P = 0.0166), located on chromosomal bands 10p14 and 9q21.31, respectively. Local replication of the remaining 21 loci showed association at two chromosomal loci (9p24.1-rs2381413 and 6p21.32-rs3132947; Bonferroni-corrected P values: 0.0033 and 0.0197, respectively). Of note, multiple SNPs in LD with rs2381413 located upstream of IL33 were significantly associated with asthma.
  
  
  
  This study has successfully transferred four reported asthma-associated loci in an independent African American population. Identification of several asthma-associated SNPs in the upstream of the IL33, a gene previously implicated in allergic inflammation of asthmatic airway, supports the generalizability of this finding.
authors.affiliation: a National Human Genome Center, Howard University College of Medicine , Washington, DC , USA.
authors.forename: Mezbah U
authors.initials: MU
authors.lastname: Faruque
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Guanjie
authors.initials: G
authors.lastname: Chen
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Ayo P
authors.initials: AP
authors.lastname: Doumatey
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhou
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Hanxia
authors.initials: H
authors.lastname: Huang
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Shriner
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Adebowale A
authors.initials: AA
authors.lastname: Adeyemo
authors.affiliation: b Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health , Bethesda , MD , USA.
authors.forename: Charles N
authors.initials: CN
authors.lastname: Rotimi
authors.affiliation: a National Human Genome Center, Howard University College of Medicine , Washington, DC , USA.
authors.forename: Georgia M
authors.initials: GM
authors.lastname: Dunston
mesh_terms: D000328:Adult; D001741:Black or African American / Q000235:genetics*; D001249:Asthma / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D055106:Genome-Wide Association Study; D005838:Genotype; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide
keywords: African Americans; Asthma; IL33; ethnicity; genetic association; replication; single nucleotide polymorphism