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2016 ; 33
(4
): 1082-93
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Detecting Genomic Signatures of Natural Selection with Principal Component
Analysis: Application to the 1000 Genomes Data
#MMPMID26715629
Duforet-Frebourg N
; Luu K
; Laval G
; Bazin E
; Blum MG
Mol Biol Evol
2016[Apr]; 33
(4
): 1082-93
PMID26715629
show ga
To characterize natural selection, various analytical methods for detecting
candidate genomic regions have been developed. We propose to perform genome-wide
scans of natural selection using principal component analysis (PCA). We show that
the common FST index of genetic differentiation between populations can be viewed
as the proportion of variance explained by the principal components. Considering
the correlations between genetic variants and each principal component provides a
conceptual framework to detect genetic variants involved in local adaptation
without any prior definition of populations. To validate the PCA-based approach,
we consider the 1000 Genomes data (phase 1) considering 850 individuals coming
from Africa, Asia, and Europe. The number of genetic variants is of the order of
36 millions obtained with a low-coverage sequencing depth (3×). The correlations
between genetic variation and each principal component provide well-known targets
for positive selection (EDAR, SLC24A5, SLC45A2, DARC), and also new candidate
genes (APPBPP2, TP1A1, RTTN, KCNMA, MYO5C) and noncoding RNAs. In addition to
identifying genes involved in biological adaptation, we identify two biological
pathways involved in polygenic adaptation that are related to the innate immune
system (beta defensins) and to lipid metabolism (fatty acid omega oxidation). An
additional analysis of European data shows that a genome scan based on PCA
retrieves classical examples of local adaptation even when there are no
well-defined populations. PCA-based statistics, implemented in the PCAdapt R
package and the PCAdapt fast open-source software, retrieve well-known signals of
human adaptation, which is encouraging for future whole-genome sequencing
project, especially when defining populations is difficult.