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. 2019 Mar 15;363(6432):1230-1234.
doi: 10.1126/science.aav4040.

The genomic history of the Iberian Peninsula over the past 8000 years

Iñigo Olalde  1 Swapan Mallick  2   3   4 Nick Patterson  3 Nadin Rohland  2 Vanessa Villalba-Mouco  5   6 Marina Silva  7 Katharina Dulias  7 Ceiridwen J Edwards  7 Francesca Gandini  7 Maria Pala  7 Pedro Soares  8 Manuel Ferrando-Bernal  9 Nicole Adamski  2   4 Nasreen Broomandkhoshbacht  2   4 Olivia Cheronet  10 Brendan J Culleton  11 Daniel Fernandes  10   12 Ann Marie Lawson  2   4 Matthew Mah  2   3   4 Jonas Oppenheimer  2   4 Kristin Stewardson  2   4 Zhao Zhang  2 Juan Manuel Jiménez Arenas  13   14   15 Isidro Jorge Toro Moyano  16 Domingo C Salazar-García  17 Pere Castanyer  18 Marta Santos  18 Joaquim Tremoleda  18 Marina Lozano  19   20 Pablo García Borja  21 Javier Fernández-Eraso  22 José Antonio Mujika-Alustiza  22 Cecilio Barroso  23 Francisco J Bermúdez  23 Enrique Viguera Mínguez  24 Josep Burch  25 Neus Coromina  25 David Vivó  25 Artur Cebrià  26 Josep Maria Fullola  26 Oreto García-Puchol  27 Juan Ignacio Morales  26 F Xavier Oms  26 Tona Majó  28 Josep Maria Vergès  19   20 Antònia Díaz-Carvajal  29 Imma Ollich-Castanyer  29 F Javier López-Cachero  26 Ana Maria Silva  30   31   32 Carmen Alonso-Fernández  33 Germán Delibes de Castro  34 Javier Jiménez Echevarría  33 Adolfo Moreno-Márquez  35   36 Guillermo Pascual BerlangaPablo Ramos-García  37 José Ramos-Muñoz  35 Eduardo Vijande Vila  35 Gustau Aguilella Arzo  38 Ángel Esparza Arroyo  39 Katina T Lillios  40 Jennifer Mack  41 Javier Velasco-Vázquez  42 Anna Waterman  43 Luis Benítez de Lugo Enrich  44   45 María Benito Sánchez  46 Bibiana Agustí  47   48 Ferran Codina  48 Gabriel de Prado  48 Almudena Estalrrich  49 Álvaro Fernández Flores  50 Clive Finlayson  51   52   53   54 Geraldine Finlayson  51   53   54 Stewart Finlayson  51   55 Francisco Giles-Guzmán  51 Antonio Rosas  56 Virginia Barciela González  57   58 Gabriel García Atiénzar  57   58 Mauro S Hernández Pérez  57   58 Armando Llanos  59 Yolanda Carrión Marco  60 Isabel Collado Beneyto  61 David López-Serrano  62 Mario Sanz TormoAntónio C Valera  63 Concepción Blasco  44 Corina Liesau  44 Patricia Ríos  44 Joan Daura  26 María Jesús de Pedro Michó  64 Agustín A Diez-Castillo  65 Raúl Flores FernándezJoan Francès Farré  66 Rafael Garrido-Pena  44 Victor S Gonçalves  31 Elisa Guerra-Doce  34 Ana Mercedes Herrero-Corral  67 Joaquim Juan-Cabanilles  68 Daniel López-Reyes  69 Sarah B McClure  70 Marta Merino Pérez  71 Arturo Oliver Foix  38 Montserrat Sanz Borràs  26 Ana Catarina Sousa  31 Julio Manuel Vidal Encinas  72 Douglas J Kennett  11   70 Martin B Richards  7 Kurt Werner Alt  73   74 Wolfgang Haak  5   75 Ron Pinhasi  10 Carles Lalueza-Fox  76 David Reich  1   3   4
Affiliations

The genomic history of the Iberian Peninsula over the past 8000 years

Iñigo Olalde et al. Science. .

Abstract

We assembled genome-wide data from 271 ancient Iberians, of whom 176 are from the largely unsampled period after 2000 BCE, thereby providing a high-resolution time transect of the Iberian Peninsula. We document high genetic substructure between northwestern and southeastern hunter-gatherers before the spread of farming. We reveal sporadic contacts between Iberia and North Africa by ~2500 BCE and, by ~2000 BCE, the replacement of 40% of Iberia's ancestry and nearly 100% of its Y-chromosomes by people with Steppe ancestry. We show that, in the Iron Age, Steppe ancestry had spread not only into Indo-European-speaking regions but also into non-Indo-European-speaking ones, and we reveal that present-day Basques are best described as a typical Iron Age population without the admixture events that later affected the rest of Iberia. Additionally, we document how, beginning at least in the Roman period, the ancestry of the peninsula was transformed by gene flow from North Africa and the eastern Mediterranean.

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Conflict of interest statement

Competing interests: The authors declare no competing interests.

Figures

Fig. 1.
Fig. 1.. Overview of the Ancient Iberian Genetic Time Transect.
(A) Geographic distribution and (B) dates of new and previously reported samples. Random jitter is added for sites with multiple individuals. Sites mentioned in the text are labeled. (C) Principal Component Analysis of 989 present-day west Eurasian individuals (grey dots), with ancient individuals from Iberia and other regions (pale yellow) projected onto the first two principal components. (D) Section of the PCA in (C). (E) Schematic representation of events documented in this study.
Fig. 2.
Fig. 2.. Genome-wide admixture proportions using qpAdm.
(A) Modeling Mesolithic, Neolithic and Copper Age populations as a mixture of Anatolia_N, El Mirón and KO1. Percentages indicate proportion of El Mirón + KO1 ancestry. (B) Proportion of ancestry derived from central European Beaker/Bronze Age populations in Iberians from the Middle Neolithic to the Iron Age (table S15). Colors indicate the Y-chromosome haplogroup for each male (table S4). (C) Ancestry proportions for individuals from three sites in northeast Iberia dated between the 6th and 12th centuries CE. (D) Ancestry proportions for individuals from southeast Iberia from the 3–16th centuries CE (tables S20-S21). Each bar represents one individual with associated mtDNA (top) and Y-chromosome (bottom). In bold, haplogroups with a likely recent non-local origin.

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