Iberian genetics: more North African than Italy, more diverse than France
Why does Iberia have more North African ancestry than Italy? Genetic studies reveal a complex gradient and debate their reliability.
English · Original discussion in Spanish · Published
The genetics of Iberia form a mosaic distinct from Italy and France, antiestéticaturing unique layers of North African, Semitic, and Romani ancestry.
The claim that "Africa begins in the Pyrenees" has more genetic basis than many admit, not as a sharp line but as a complex gradient. While North African admixture in Italy is ancient and faint, and only Occitania resembles the Iberian pattern in France, the Iberian Peninsula presents a cocktail of historical contributions making it the most heterogeneous region in Southern Europe.
The North African gradient in Iberia: from Galicia to Andalusia
Cited studies —Adams et al. (2008), Olalde et al. (2019) and Bycroft (2019)— place the North African component between 10-15% in Andalusia and Extremadura and 3-5% in most of Galicia, with peaks of 8-10% in southern Pontevedra. The Cantabrian strip (Basque Country, Asturias, Cantabria) marks the minimum: less than 1%. This distribution reflects Muslim rule, medieval repopulation, and later migrations. Notably, northwestern Spain, particularly southern Galicia, shows higher North African signals than previously thought, though far below those in Lower Andalusia.
Distinguishing Berber lineages (E1b1b1b-M81) from Semitic ones (J1, J2) adds another layer. According to Flores' meta-analysis (2011), Berber components dominate Huelva, Seville, Malaga, and western Cadiz, while Semitic markers are stronger in eastern Cadiz (Phoenician heritage) and distributed across Cordoba. On the Levantine coast (Valencian Community, Murcia), North African ancestry reaches 10-14%, explained by Barbary piracy and repopulation with Aragonese Moriscos.
Overlooking Sub-Saharan and Romani components
Recent discussions rightly highlight two contributions often underrepresented in classic studies: Sub-Saharan and Romani minorities. Rodríguez et al. (2024) papers on Extremadura's border regions with Portugal show Sub-Saharan ancestry is not residual but significant in southwest Badajoz and northern Caceres, driven by Atlantic slave trade. In Portugal, the average is 2-5%, peaking at 8-10% in Lisbon, Algarve, and Madeira. Romani presence, documented in admixture studies (Martín et al. 2023), is dense in Granada, Almería, Jaén, and Badajoz, averaging 8-15% when including Romani populations.
Granada stands out for the highest sum of non-European components: North African, Sub-Saharan, and Romani combine to create a unique profile, though no single marker is the highest in Spain alone.
Italy and France: two different genetic models
In Italy, North African mixing is older and much more diluted. There is no trace of recent Maghrebi influence comparable to Iberia; Italy's main "drama," so to speak, is a long-standing Levantine and Mediterranean mix without such pronounced regional peaks. France shows similarities with Spain only in Occitania (south). The rest of the hexagon, from Normandy to Alsace, is dominated by a Germanic and Celtic substrate with little North African footprint. The old phrase "Africa begins in the Pyrenees" falls short: Southern Europe is a gradient starting in the Maghreb, fading north of the Pyrenees, but with a mandatory stop in Iberia.
Data reliability always under suspicion
Not everyone trusts circulating genetic maps. Critics note that testing companies (like 23andMe) change algorithms, and samples are small and biased. "There are no statistics," they argue, "only papers being reinterpreted." Skeptics recall that Calafell's (2008) Y-chromosome data doesn't always align with later autosomal DNA results, and interpretation is rarely univocal. The debate remains open, fueling interest in a genetically surprising region.
Overall, the pattern is clear: Iberia is an unparalleled genetic laboratory in the Western Mediterranean, far more varied than Italy and France, with a genetic history still being written.
The claim that "Africa begins in the Pyrenees" has more genetic basis than many admit, not as a sharp line but as a complex gradient. While North African admixture in Italy is ancient and faint, and only Occitania resembles the Iberian pattern in France, the Iberian Peninsula presents a cocktail of historical contributions making it the most heterogeneous region in Southern Europe.
The North African gradient in Iberia: from Galicia to Andalusia
Cited studies —Adams et al. (2008), Olalde et al. (2019) and Bycroft (2019)— place the North African component between 10-15% in Andalusia and Extremadura and 3-5% in most of Galicia, with peaks of 8-10% in southern Pontevedra. The Cantabrian strip (Basque Country, Asturias, Cantabria) marks the minimum: less than 1%. This distribution reflects Muslim rule, medieval repopulation, and later migrations. Notably, northwestern Spain, particularly southern Galicia, shows higher North African signals than previously thought, though far below those in Lower Andalusia.
Distinguishing Berber lineages (E1b1b1b-M81) from Semitic ones (J1, J2) adds another layer. According to Flores' meta-analysis (2011), Berber components dominate Huelva, Seville, Malaga, and western Cadiz, while Semitic markers are stronger in eastern Cadiz (Phoenician heritage) and distributed across Cordoba. On the Levantine coast (Valencian Community, Murcia), North African ancestry reaches 10-14%, explained by Barbary piracy and repopulation with Aragonese Moriscos.
Overlooking Sub-Saharan and Romani components
Recent discussions rightly highlight two contributions often underrepresented in classic studies: Sub-Saharan and Romani minorities. Rodríguez et al. (2024) papers on Extremadura's border regions with Portugal show Sub-Saharan ancestry is not residual but significant in southwest Badajoz and northern Caceres, driven by Atlantic slave trade. In Portugal, the average is 2-5%, peaking at 8-10% in Lisbon, Algarve, and Madeira. Romani presence, documented in admixture studies (Martín et al. 2023), is dense in Granada, Almería, Jaén, and Badajoz, averaging 8-15% when including Romani populations.
Granada stands out for the highest sum of non-European components: North African, Sub-Saharan, and Romani combine to create a unique profile, though no single marker is the highest in Spain alone.
Italy and France: two different genetic models
In Italy, North African mixing is older and much more diluted. There is no trace of recent Maghrebi influence comparable to Iberia; Italy's main "drama," so to speak, is a long-standing Levantine and Mediterranean mix without such pronounced regional peaks. France shows similarities with Spain only in Occitania (south). The rest of the hexagon, from Normandy to Alsace, is dominated by a Germanic and Celtic substrate with little North African footprint. The old phrase "Africa begins in the Pyrenees" falls short: Southern Europe is a gradient starting in the Maghreb, fading north of the Pyrenees, but with a mandatory stop in Iberia.
Data reliability always under suspicion
Not everyone trusts circulating genetic maps. Critics note that testing companies (like 23andMe) change algorithms, and samples are small and biased. "There are no statistics," they argue, "only papers being reinterpreted." Skeptics recall that Calafell's (2008) Y-chromosome data doesn't always align with later autosomal DNA results, and interpretation is rarely univocal. The debate remains open, fueling interest in a genetically surprising region.
Overall, the pattern is clear: Iberia is an unparalleled genetic laboratory in the Western Mediterranean, far more varied than Italy and France, with a genetic history still being written.
Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (107 replies).
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