Genome-wide association study and admixture mapping reveal new loci associated with total IgE levels in Latinos
Pino-Yanes M, Gignoux C, Galanter J, Levin AM, Campbell C, Eng C, Huntsman S, Nishimura K, Gourraud P, Mohajeri K, O'Roak B, Hu D, Mathias R, Nguyen E, Roth L, Padhukasahasram B, Moreno-Estrada A, Sandoval K, Winkler C, Lurmann F, Davis A, Farber H, Meade K, Avila P, Serebrisky D, Chapela R, Ford J, Lenoir M, Thyne S, Brigino-Buenaventura E, Borrell L, Rodriguez-Cintron W, Sen S, Kumar R, Rodriguez-Santana J, Bustamante C, Martinez F, Raby B, Weiss S, Nicolae D, Ober C, Meyers D, Bleecker E, Mack S, Hernandez R, Eichler E, Barnes K, Williams KL, Torgerson D, Burchard E. Genome-wide association study and admixture mapping reveal new loci associated with total IgE levels in Latinos. Journal of Allergy and Clinical Immunology 2015; 135(6):1502-1510.
Journal of Allergy and Clinical Immunology
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.
Medical Subject Headings
Adolescent; Adult; African Americans; Child; Chromosome Mapping; Chromosomes, Human, Pair 14; DNA-Binding Proteins; European Continental Ancestry Group; Female; Genetic Loci; Genome, Human; Genome-Wide Association Study; Genotype; HLA-DQ alpha-Chains; Hispanic Americans; Humans; Immunoglobulin E; Male; Polymorphism, Single Nucleotide; Transcription Factors