Cited by 96Genetic and phenotypic traits in livestockForensic and Genetic ResearchGenetic diversity and population structure

Inferring Allele Frequency Trajectories from Ancient DNA Indicates That Selection on a Chicken Gene Coincided with Changes in Medieval Husbandry Practices

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Loog, Liisa, Thomas, Mark G., Barnett, Ross, Allen, Richard, Sykes, Naomi, Paxinos, Ptolemaios D., Lebrasseur, Ophélie, Dobney, Keith +4 more·2017·Molecular Biology and Evolution

Abstract

Ancient DNA provides an opportunity to infer the drivers of natural selection by linking allele frequency changes to temporal shifts in environment or cultural practices. However, analyses have often been hampered by uneven sampling and uncertainties in sample dating, as well as being confounded by demographic processes. Here, we present a Bayesian statistical framework for quantifying the timing and strength of selection using ancient DNA that explicitly addresses these challenges. We applied this method to time series data for two loci: TSHR and BCDO2, both hypothesised to have undergone strong and recent selection in domestic chickens. The derived variant in TSHR, associated with reduced aggression to conspecifics and faster onset of egg laying, shows strong selection beginning around 1,100 years ago, coincident with archaeological evidence for intensified chicken production and documented changes in egg and chicken consumption. To our knowledge, this is the first example of preindustrial domesticate trait selection in response to a historically attested cultural shift in food preference. For BCDO2, we find support for selection, but demonstrate that the recent rise in allele frequency could also have been driven by gene flow from imported Asian chickens during more recent breed formations. Our findings highlight that traits found ubiquitously in modern domestic species may not necessarily have originated during the early stages of domestication. In addition, our results demonstrate the importance of precise estimation of allele frequency trajectories through time for understanding the drivers of selection.

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  • An ancient DNA study shows how two strong sweeps in the domestic chicken, at TSHR and BCO2, both were selected much later than early domestication.

    “For example, an ancient DNA study shows how two strong sweeps in the domestic chicken, at TSHR and BCO2, both were selected much later than early domestication (Flink et al. 2014; Loog et al. 2017).”

    From The neural crest cell hypothesis: no unified explanation for domestication (2021) · cites this paper as Loog et al. 2017

    The Results section dates strong selection at TSHR to around 920 AD, long after early domestication. For BCDO2, the Results say that the start of selection is poorly resolved and that its allele frequency rose only marginally before recent Asian gene flow; the paper therefore does not establish a second strong, late sweep. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Throughout much of early medieval Europe, poultry farming likely benefited from the spread of Christianity, and chickens were also associated with early monastic contexts in Ireland.

    “Throughout much of early medieval Europe, poultry farming likely benefited from the spread of Christianity (78), and chickens were also associated with early monastic contexts in Ireland (SI Appendix, Table S2).”

    From The biocultural origins and dispersal of domestic chickens (2022) · cites this paper as [78]

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  1. Hüster Plogmann H. 2006 Untersuchungen an den Skelettresten von Säugetieren und Vögeln aus dem Hafen von Haithabu In: Schietzel K, editor. Berichte über die Ausgrabungen in Haithabu. Vol. 35 Neumünster: Wachholtz p. 25– 156.

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Authors
Loog, L., Thomas, M. G., Barnett, R., Allen, R., Sykes, N., Paxinos, P. D., Lebrasseur, O., Dobney, K., Peters, J., Manica, A., Larson, G., & Eriksson, A.
Affiliations
  • University of Cambridge (GB)
  • University College London (GB)
  • University of Oxford (GB)
  • University of Nottingham (GB)
  • Ludwig-Maximilians-Universität München (DE)
  • University of Liverpool (GB)
  • Bavarian Natural History Collections (DE)
  • Guy's Hospital (GB)
Corresponding author
  • Loog, Liisa
  • Larson, Greger
  • Eriksson, Anders
Venue
Molecular Biology and Evolution
Published
2017-05-02
Volume
34
Issue
8
Pages
1981-1990
ISSN
  • 0737-4038 (ISSN-L)
  • 1537-1719
OpenAlex
W2607157138
Cited by
82
References
35
Citations by year
2026: 4 · 2025: 21 · 2024: 5 · 2023: 6 · 2022: 8 · 2021: 12 · 2020: 7 · 2019: 11 · 2018: 4 · 2017: 4
FWCI
6.52
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology and Evolution (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (submittedVersion, cc-by)
  • UCL Discovery (University College London) (submittedVersion)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
  • Apollo (cc-by)
Funders
  • Natural Environment Research Council (NE/K005243/1, NE/K003259/1)
  • Wellcome Trust (100719/Z/12/Z)
  • Leverhulme Trust (RP2011-R-045)
  • Arts and Humanities Research Council (AH/L006979/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
Keywords
chickens, natural selection, TSHR, oviposition, aggression, food preferences, gene flow, chicken domestication, ancient DNA
MeSH terms
DNA, Ancient, Alleles, Animals, Animal Husbandry, Animals, Domestic, Bayes Theorem, Breeding, Chickens, DNA, Mitochondrial, Gene Frequency, Poultry, Receptors, Thyrotropin, Selection, Genetic, Sequence Analysis, DNA, Dioxygenases

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