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Research Article

Direct evidence for positive selection of skin, hair, and eye pigmentation in Europeans during the last 5,000 y

Sandra Wilde, Adrian Timpson, Karola Kirsanow, Elke Kaiser, Manfred Kayser, Martina Unterländer, Nina Hollfelder, Inna D. Potekhina, Wolfram Schier, Mark G. Thomas, and Joachim Burger
PNAS first published March 10, 2014; https://doi.org/10.1073/pnas.1316513111
Sandra Wilde
aInstitute of Anthropology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany;
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Adrian Timpson
bResearch Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, United Kingdom;
cInstitute of Archaeology, University College London, London WC1H 0PY, United Kingdom;
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Karola Kirsanow
aInstitute of Anthropology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany;
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Elke Kaiser
dInstitute of Prehistoric Archaeology, Freie Universität Berlin, 14195 Berlin, Germany;
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Manfred Kayser
eDepartment of Forensic Molecular Biology, Erasmus University Medical Center Rotterdam, 3000 CA, Rotterdam, The Netherlands; and
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Martina Unterländer
aInstitute of Anthropology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany;
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Nina Hollfelder
aInstitute of Anthropology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany;
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Inna D. Potekhina
fInstitute of Archaeology, Academy of Science of the Ukraine, 04210 Kiev-210, Ukraine
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Wolfram Schier
dInstitute of Prehistoric Archaeology, Freie Universität Berlin, 14195 Berlin, Germany;
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Mark G. Thomas
bResearch Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, United Kingdom;
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  • For correspondence: m.thomas@ucl.ac.uk
Joachim Burger
aInstitute of Anthropology, Johannes Gutenberg University Mainz, 55128 Mainz, Germany;
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  1. Edited by Nina G. Jablonski, The Pennsylvania State University, University Park, Pennsylvania, and accepted by the Editorial Board February 1, 2014 (received for review September 4, 2013)

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Significance

Eye, hair, and skin pigmentation are highly variable in humans, particularly in western Eurasian populations. This diversity may be explained by population history, the relaxation of selection pressures, or positive selection. To investigate whether positive natural selection is responsible for depigmentation within Europe, we estimated the strength of selection acting on three genes known to have significant effects on human pigmentation. In a direct approach, these estimates were made using ancient DNA from prehistoric Europeans and computer simulations. This allowed us to determine selection coefficients for a precisely bounded period in the deep past. Our results indicate that strong selection has been operating on pigmentation-related genes within western Eurasia for the past 5,000 y.

Abstract

Pigmentation is a polygenic trait encompassing some of the most visible phenotypic variation observed in humans. Here we present direct estimates of selection acting on functional alleles in three key genes known to be involved in human pigmentation pathways—HERC2, SLC45A2, and TYR—using allele frequency estimates from Eneolithic, Bronze Age, and modern Eastern European samples and forward simulations. Neutrality was overwhelmingly rejected for all alleles studied, with point estimates of selection ranging from around 2–10% per generation. Our results provide direct evidence that strong selection favoring lighter skin, hair, and eye pigmentation has been operating in European populations over the last 5,000 y.

  • ancient DNA
  • computer simulations
  • natural selection
  • Neolithic/Bronze Age
  • Eastern Europe

Footnotes

  • ↵1Present address: Department of Ecology and Genetics, Evolutionary Biology, Uppsala University, 75236 Uppsala, Sweden.

  • ↵2To whom correspondence should be addressed. E-mail: m.thomas{at}ucl.ac.uk.
  • Author contributions: S.W., M.G.T., and J.B. designed research; S.W., A.T., M.U., N.H., and M.G.T. performed research; A.T. and M.G.T. contributed new reagents/analytic tools; E.K. and W.S. coordinated the acquisition of the archaeological sample material and provided background information; I.D.P. provided archaeological sample material and background information; M.G.T. and J.B. coordinated this study; S.W., A.T., N.H., and M.G.T. analyzed data; and S.W., A.T., K.K., E.K., M.K., M.U., N.H., I.D.P., W.S., M.G.T., and J.B. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission. N.G.J. is a guest editor invited by the Editorial Board.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1316513111/-/DCSupplemental.

Freely available online through the PNAS open access option.

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Direct evidence for selection on pigmentation
Sandra Wilde, Adrian Timpson, Karola Kirsanow, Elke Kaiser, Manfred Kayser, Martina Unterländer, Nina Hollfelder, Inna D. Potekhina, Wolfram Schier, Mark G. Thomas, Joachim Burger
Proceedings of the National Academy of Sciences Mar 2014, 201316513; DOI: 10.1073/pnas.1316513111

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Direct evidence for selection on pigmentation
Sandra Wilde, Adrian Timpson, Karola Kirsanow, Elke Kaiser, Manfred Kayser, Martina Unterländer, Nina Hollfelder, Inna D. Potekhina, Wolfram Schier, Mark G. Thomas, Joachim Burger
Proceedings of the National Academy of Sciences Mar 2014, 201316513; DOI: 10.1073/pnas.1316513111
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