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. 2015 Jun;135(6):1502-10.
doi: 10.1016/j.jaci.2014.10.033. Epub 2014 Dec 6.

Genome-wide association study and admixture mapping reveal new loci associated with total IgE levels in Latinos

Affiliations

Genome-wide association study and admixture mapping reveal new loci associated with total IgE levels in Latinos

Maria Pino-Yanes et al. J Allergy Clin Immunol. 2015 Jun.

Abstract

Background: IgE is a key mediator of allergic inflammation, and its levels are frequently increased in patients with allergic disorders.

Objective: We sought to identify genetic variants associated with IgE levels in Latinos.

Methods: We performed a genome-wide association study and admixture mapping of total IgE levels in 3334 Latinos from the Genes-environments & Admixture in Latino Americans (GALA II) study. Replication was evaluated in 454 Latinos, 1564 European Americans, and 3187 African Americans from independent studies.

Results: We confirmed associations of 6 genes identified by means of previous genome-wide association studies and identified a novel genome-wide significant association of a polymorphism in the zinc finger protein 365 gene (ZNF365) with total IgE levels (rs200076616, P = 2.3 × 10(-8)). We next identified 4 admixture mapping peaks (6p21.32-p22.1, 13p22-31, 14q23.2, and 22q13.1) at which local African, European, and/or Native American ancestry was significantly associated with IgE levels. The most significant peak was 6p21.32-p22.1, where Native American ancestry was associated with lower IgE levels (P = 4.95 × 10(-8)). All but 22q13.1 were replicated in an independent sample of Latinos, and 2 of the peaks were replicated in African Americans (6p21.32-p22.1 and 14q23.2). Fine mapping of 6p21.32-p22.1 identified 6 genome-wide significant single nucleotide polymorphisms in Latinos, 2 of which replicated in European Americans. Another single nucleotide polymorphism was peak-wide significant within 14q23.2 in African Americans (rs1741099, P = 3.7 × 10(-6)) and replicated in non-African American samples (P = .011).

Conclusion: We confirmed genetic associations at 6 genes and identified novel associations within ZNF365, HLA-DQA1, and 14q23.2. Our results highlight the importance of studying diverse multiethnic populations to uncover novel loci associated with total IgE levels.

Keywords: Hispanics; IgE; Latinos; admixture mapping; allergy; asthma; genome-wide association study; minority populations; next-generation sequencing.

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Figures

Figure 1
Figure 1
Fine mapping of ZNF365 in GALA II. Included in the plot are -log10(p-values) of association with total serum IgE by chromosome position. The most significant SNP is represented by a diamond and the results for the remaining SNPs are color coded to show their linkage disequilibrium (LD) with this SNP based on pairwise r2 values from the Latino populations of the 1000 Genomes Project. SNPs above the dashed line are genome-wide significant (p≤5x10−8).
Figure 2
Figure 2
Boxplot showing the distribution of IgE levels for each copy of a chromosome of A) Native American, B) European, and C) African ancestry at 6p21.33.
Figure 3
Figure 3
Fine mapping results of 6p21.32-p22.1 in GALA II, focusing on the region showing genome-wide significant allelic associations. Included in the plot are -log10(p-values) of association with total serum IgE by chromosome position. The most significant SNP is represented by a diamond and the results for the remaining SNPs are color coded to show their linkage disequilibrium (LD) with this SNP based on pairwise r2 values from the Latino populations of the 1000 Genomes Project. SNPs above the dashed line are genome-wide significant (p≤5x10−8).

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