title: Admixture mapping identifies a quantitative trait locus associated with FEV1/FVC in the COPDGene Study.
abstract: African Americans are admixed with genetic contributions from European and African ancestral populations. Admixture mapping leverages this information to map genes influencing differential disease risk across populations. We performed admixture and association mapping in 3,300 African American current or former smokers from the COPDGene Study. We analyzed estimated local ancestry and SNP genotype information to identify regions associated with FEV1 /FVC, the ratio of forced expiratory volume in one second to forced vital capacity, measured by spirometry performed after bronchodilator administration. Global African ancestry inversely associated with FEV1 /FVC (P = 0.035). Genome-wide admixture analysis, controlling for age, gender, body mass index, current smoking status, pack-years smoked, and four principal components summarizing the genetic background of African Americans in the COPDGene Study, identified a region on chromosome 12q14.1 associated with FEV1 /FVC (P = 2.1 × 10(-6) ) when regressed on local ancestry. Allelic association in this region of chromosome 12 identified an intronic variant in FAM19A2 (rs348644) as associated with FEV1 /FVC (P = 1.76 × 10(-6) ). By combining admixture and association mapping, a marker on chromosome 12q14.1 was identified as being associated with reduced FEV1 /FVC ratio among African Americans in the COPDGene Study.
authors.affiliation: Department of Epidemiology, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, Maryland, United States of America.
authors.forename: Margaret M
authors.initials: MM
authors.lastname: Parker
authors.forename: Marilyn G
authors.initials: MG
authors.lastname: Foreman
authors.forename: Haley J
authors.initials: HJ
authors.lastname: Abel
authors.forename: Rasika A
authors.initials: RA
authors.lastname: Mathias
authors.forename: Jacqueline B
authors.initials: JB
authors.lastname: Hetmanski
authors.forename: James D
authors.initials: JD
authors.lastname: Crapo
authors.forename: Edwin K
authors.initials: EK
authors.lastname: Silverman
authors.forename: Terri H
authors.initials: TH
authors.lastname: Beaty
mesh_terms: D001741:Black or African American / Q000235:genetics; D019742:Chemokines, CC / Q000235:genetics*; D002874:Chromosome Mapping; D004198:Disease Susceptibility; D005260:Female; D005541:Forced Expiratory Volume / Q000235:genetics; D005787:Gene Frequency; D056726:Genetic Association Studies; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D029424:Pulmonary Disease, Chronic Obstructive / Q000235:genetics* / Q000503:physiopathology; D040641:Quantitative Trait Loci; D012307:Risk Factors; D014797:Vital Capacity / Q000235:genetics*; D044465:White People / Q000235:genetics
chemical_list: D019742:Chemokines, CC; C000593457:TAFA2 protein, human
keywords: African Americans; COPD; admixture mapping; lung function
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