France may look genetically homogeneous at the European scale, but genome-wide data reveal clear regional differences in its ancestry.
Researchers analyzed 2,184 people born across continental France and consistently identified six broad genetic regions: Southwest, South, Center, Northwest, North and Southeast. These divisions closely followed geography and historical regions.
When French populations were modeled using three major prehistoric sources, Neolithic Farmer-related ancestry was the largest component, at roughly 46.5–66.2% across regions.
Steppe-related ancestry ranged from approximately 19.6–41.2%, reaching its highest levels in northwestern France. Western Hunter-Gatherer ancestry was smaller, around 6.3–16.2%, with the highest estimates in the southwest. The authors caution that this simplified three-way model does not perfectly fit every region, so these percentages are approximate.
The regional affinities are equally striking. Southwestern France shows stronger Iberian and Basque-related affinity, while southeastern France shifts more toward Italian references. Northern and northwestern France show stronger northwestern European affinity.
Brittany is particularly distinctive: it is genetically closer to northwestern Europe than to northern France, a pattern the authors suggest may partly reflect historical migration from Britain into Armorica.
These differences remain small overall, but they show how prehistoric migrations, neighboring populations, rivers, mountains and centuries of regional history helped shape the genetic landscape of modern France.
📚 Source: Saint Pierre et al. (2020), European Journal of Human Genetics
The genetic history of France
🧬 Curious about your own ancestry?
🌍 Explore your DNA at https://www.worldgenetics.app/
