A small number of candidate gene SNPs reveal continental ancestry in African Americans.

Abstract:

:Using genetic data from an obesity candidate gene study of self-reported African Americans and European Americans, we investigated the number of Ancestry Informative Markers (AIMs) and candidate gene SNPs necessary to infer continental ancestry. Proportions of African and European ancestry were assessed with STRUCTURE (K = 2), using 276 AIMs. These reference values were compared to estimates derived using 120, 60, 30, and 15 SNP subsets randomly chosen from the 276 AIMs and from 1144 SNPs in 44 candidate genes. All subsets generated estimates of ancestry consistent with the reference estimates, with mean correlations greater than 0.99 for all subsets of AIMs, and mean correlations of 0.99 ± 0.003; 0.98 ± 0.01; 0.93 ± 0.03; and 0.81 ± 0.11 for subsets of 120, 60, 30, and 15 candidate gene SNPs, respectively. Among African Americans, the median absolute difference from reference African ancestry values ranged from 0.01 to 0.03 for the four AIMs subsets and from 0.03 to 0.09 for the four candidate gene SNP subsets. Furthermore, YRI/CEU Fst values provided a metric to predict the performance of candidate gene SNPs. Our results demonstrate that a small number of SNPs randomly selected from candidate genes can be used to estimate admixture proportions in African Americans reliably.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Kodaman N,Aldrich MC,Smith JR,Signorello LB,Bradley K,Breyer J,Cohen SS,Long J,Cai Q,Giles J,Bush WS,Blot WJ,Matthews CE,Williams SM

doi

10.1111/j.1469-1809.2012.00738.x

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

56-66

issue

1

eissn

0003-4800

issn

1469-1809

journal_volume

77

pub_type

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