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FADS1 and the timing of human adaptation to agriculture

Sara Mathieson, Iain Mathieson
doi: https://doi.org/10.1101/337998
Sara Mathieson
1Department of Computer Science, Swarthmore College, Swarthmore, PA 19081
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Iain Mathieson
2Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia PA 19104
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  • For correspondence: mathi@pennmedicine.upenn.edu
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Abstract

Variation at the FADS1/FADS2 gene cluster is functionally associated with differences in lipid metabolism and is often hypothesized to reflect adaptation to an agricultural diet. Here, we test the evidence for this relationship using both modern and ancient DNA data. We document pre-out-of-Africa selection for both the derived and ancestral FADS1 alleles and show that almost all the inhabitants of Europe carried the ancestral allele until the derived allele was introduced approximately 8,500 years ago by Early Neolithic farming populations. However, we also show that it was not under strong selection in these populations. Further, we find that this allele, and other proposed agricultural adaptations including variants at LCT/MCM6, SLC22A4 and NAT2, were not strongly selected until the Bronze Age, 2,000-4,000 years ago. Similarly, increased copy number variation at the salivary amylase gene AMY1 is not linked to the development of agriculture although in this case, the putative adaptation precedes the agricultural transition. Our analysis shows that selection at the FADS locus was not tightly linked to the development of agriculture. Further, it suggests that the strongest signals of recent human adaptation may not have been driven by the agricultural transition but by more recent changes in environment or by increased efficiency of selection due to increases in effective population size.

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Posted June 03, 2018.
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FADS1 and the timing of human adaptation to agriculture
Sara Mathieson, Iain Mathieson
bioRxiv 337998; doi: https://doi.org/10.1101/337998
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FADS1 and the timing of human adaptation to agriculture
Sara Mathieson, Iain Mathieson
bioRxiv 337998; doi: https://doi.org/10.1101/337998

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