EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations

Chen G-B, Lee SH, Zhu Z-X, Benyamin B, Robinson MR. 2016. EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations. Heredity. 117, 51–61.

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Journal Article | Published | English
Author
Chen, G-B; Lee, S H; Zhu, Z-X; Benyamin, B; Robinson, Matthew RichardIST Austria
Abstract
We develop a novel approach to identify regions of the genome underlying population genetic differentiation in any genetic data where the underlying population structure is unknown, or where the interest is assessing divergence along a gradient. By combining the statistical framework for genome-wide association studies (GWASs) with eigenvector decomposition (EigenGWAS), which is commonly used in population genetics to characterize the structure of genetic data, loci under selection can be identified without a requirement for discrete populations. We show through theory and simulation that our approach can identify regions under selection along gradients of ancestry, and in real data we confirm this by demonstrating LCT to be under selection between HapMap CEU–TSI cohorts, and we then validate this selection signal across European countries in the POPRES samples. HERC2 was also found to be differentiated between both the CEU–TSI cohort and within the POPRES sample, reflecting the likely anthropological differences in skin and hair colour between northern and southern European populations. Controlling for population stratification is of great importance in any quantitative genetic study and our approach also provides a simple, fast and accurate way of predicting principal components in independent samples. With ever increasing sample sizes across many fields, this approach is likely to be greatly utilized to gain individual-level eigenvectors avoiding the computational challenges associated with conducting singular value decomposition in large data sets. We have developed freely available software, Genetic Analysis Repository (GEAR), to facilitate the application of the methods.
Publishing Year
Date Published
2016-05-04
Journal Title
Heredity
Volume
117
Page
51-61
IST-REx-ID

Cite this

Chen G-B, Lee SH, Zhu Z-X, Benyamin B, Robinson MR. EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations. Heredity. 2016;117:51-61. doi:10.1038/hdy.2016.25
Chen, G.-B., Lee, S. H., Zhu, Z.-X., Benyamin, B., & Robinson, M. R. (2016). EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations. Heredity. Springer Nature. https://doi.org/10.1038/hdy.2016.25
Chen, G-B, S H Lee, Z-X Zhu, B Benyamin, and Matthew Richard Robinson. “EigenGWAS: Finding Loci under Selection through Genome-Wide Association Studies of Eigenvectors in Structured Populations.” Heredity. Springer Nature, 2016. https://doi.org/10.1038/hdy.2016.25.
G.-B. Chen, S. H. Lee, Z.-X. Zhu, B. Benyamin, and M. R. Robinson, “EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations,” Heredity, vol. 117. Springer Nature, pp. 51–61, 2016.
Chen G-B, Lee SH, Zhu Z-X, Benyamin B, Robinson MR. 2016. EigenGWAS: Finding loci under selection through genome-wide association studies of eigenvectors in structured populations. Heredity. 117, 51–61.
Chen, G. B., et al. “EigenGWAS: Finding Loci under Selection through Genome-Wide Association Studies of Eigenvectors in Structured Populations.” Heredity, vol. 117, Springer Nature, 2016, pp. 51–61, doi:10.1038/hdy.2016.25.

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