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Related Experiment Videos

Y genetic data support the Neolithic demic diffusion model.

Lounes Chikhi1, Richard A Nichols, Guido Barbujani

  • 1Department of Biology, University College London, Darwin Building, London WC1E 6BT, United Kingdom. l.chikhi@ucl.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2002
PubMed
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The European gene pool

Area of Science:

  • Population Genetics
  • Human Prehistory
  • Ancient DNA Analysis

Background:

  • The origins of the European gene pool remain debated, particularly the contributions of Palaeolithic hunter-gatherers versus Neolithic farmers.
  • Previous studies relied on indirect methods, leading to ongoing controversy regarding genetic admixture.
  • Understanding this admixture is crucial for reconstructing European population history.

Purpose of the Study:

  • To directly estimate the genetic contributions of Palaeolithic hunter-gatherers and Neolithic farmers at their initial contact.
  • To resolve the controversy surrounding the relative genetic input from these two ancestral groups.
  • To test models of Neolithic transition, such as cultural diffusion versus demic diffusion.

Main Methods:

  • Analysis of 22 binary markers from the non-recombining region of the Y chromosome (NRY).

Related Experiment Videos

  • Application of a novel statistical framework using a genealogical likelihood-based approach.
  • Direct estimation of admixture proportions between ancestral populations.

    • Main Results:

    • Neolithic farmers made a significantly larger genetic contribution to the early European gene pool than previously estimated.
    • A notable decrease in genetic admixture was observed from the Near East towards Western Europe.
    • Local hunter-gatherer contribution to initial settlements was estimated to be less than 30%.

    Conclusions:

    • The findings support the demic diffusion model, suggesting migration played a primary role in spreading agriculture.
    • Predominantly cultural transmission of agriculture is unlikely given the substantial genetic contribution of farmers.
    • This study refines our understanding of the Neolithic transition and its genetic impact on European populations.