What question did this study set out to answer?

To assess the genetic origins of Ashkenazi Jews by correcting methodological biases from previous studies.

January 17, 2026Open Access

How Ashkenazi Origins Were Mis-modeled: Southern Italian Ancestry, Proxy Bias, and the Illusion of Levantine Intermediacy

Key Points

To assess the genetic origins of Ashkenazi Jews by correcting methodological biases from previous studies.
Utilized autosomal FST distances for genetic distance analysis.
Applied principal component analysis to visualize genetic relationships.
Employed qpAdm admixture modeling for assessing ancestry.
Included Southern Italian and central Mediterranean populations in the analysis.
Analyzed uniparental haplogroup distributions for deeper ancestry insights.
Identified Ashkenazi Jews within a Southern European-Mediterranean genetic continuum.
Revealed that earlier perceived genetic links to the Levant were artifacts of reference population choice.
Showed significant influences of founder effects and endogamy on Ashkenazi genetics.

Abstract

This manuscript presents an independent population-genetic analysis of Ashkenazi Jewish origins using autosomal FST distances, principal component analysis, qpAdm admixture modeling, uniparental subclade distributions, and historical context. By directly including Southern Italian and central Mediterranean reference populations that were omitted or substituted in prior studies, the analysis shows that apparent Ashkenazi genetic intermediacy between Europe and the Levant is a methodological artifact of reference population design. Across multiple independent datasets and analytical frameworks, Ashkenazi Jews resolve within a Southern European–Mediterranean genetic continuum shaped by founder effects, endogamy, and later Eastern European admixture.

How Ashkenazi Origins Were Mis-modeled: Southern Italian Ancestry, Proxy Bias, and the Illusion of Levantine Intermediacy

Key Points

Abstract

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