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. 2019 Mar 20;14(3):e0209125.
doi: 10.1371/journal.pone.0209125. eCollection 2019.

Mitogenomes illuminate the origin and migration patterns of the indigenous people of the Canary Islands

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Mitogenomes illuminate the origin and migration patterns of the indigenous people of the Canary Islands

Rosa Fregel et al. PLoS One. .

Abstract

The Canary Islands' indigenous people have been the subject of substantial archaeological, anthropological, linguistic and genetic research pointing to a most probable North African Berber source. However, neither agreement about the exact point of origin nor a model for the indigenous colonization of the islands has been established. To shed light on these questions, we analyzed 48 ancient mitogenomes from 25 archaeological sites from the seven main islands. Most lineages observed in the ancient samples have a Mediterranean distribution, and belong to lineages associated with the Neolithic expansion in the Near East and Europe (T2c, J2a, X3a…). This phylogeographic analysis of Canarian ancient mitogenomes, the first of its kind, shows that some lineages are restricted to Central North Africa (H1cf, J2a2d and T2c1d3), while others have a wider distribution, including both West and Central North Africa, and, in some cases, Europe and the Near East (U6a1a1, U6a7a1, U6b, X3a, U6c1). In addition, we identify four new Canarian-specific lineages (H1e1a9, H4a1e, J2a2d1a and L3b1a12) whose coalescence dates correlate with the estimated time for the colonization of the islands (1st millennia CE). Additionally, we observe an asymmetrical distribution of mtDNA haplogroups in the ancient population, with certain haplogroups appearing more frequently in the islands closer to the continent. This reinforces results based on modern mtDNA and Y-chromosome data, and archaeological evidence suggesting the existence of two distinct migrations. Comparisons between insular populations show that some populations had high genetic diversity, while others were probably affected by genetic drift and/or bottlenecks. In spite of observing interinsular differences in the survival of indigenous lineages, modern populations, with the sole exception of La Gomera, are homogenous across the islands, supporting the theory of extensive human mobility after the European conquest.

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Conflict of interest statement

Tibicena Arqueología y Patrimonio provided support in the form of salaries for authors V.A. and M.A.M.B and radiocarbon dating of four archaeological samples. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Figures

Fig 1
Fig 1. Map of the Canary Islands showing the geographical location of the archaeological sites included in this study.
Codes are as follows: 1 –Cueva del Agua; 2 –Huerto de los Morales; 3 –Salto del Casimiro; 4 –El Espigón; 5 –Los Pasitos; 6 –Punta Azul; 7 –Barranco de Majona; 8 –El Pescante; 9 –Antoncojo; 10 –Las Arenas; 11 –El Cedro; 12 –El Salitre; 13 –El Portillo; 14 –La Angostura; 15 –El Cascajo; 16 –El Capricho; 17 –El Agujero; 18 –El Hormiguero; 19 –Guayadeque; 20 –La Fortaleza; 21 –Cuermeja; 22 –Lomo Galeón; 23 –Puente de la Calzada; 24 –El Huriamen; 25 –Montaña Mina.
Fig 2
Fig 2. DNA authentication results for all the samples included in this study.
A) Insert size density plot. B) Contamination rates estimated using contamMix and schmutzi. C) Damage patterns.
Fig 3
Fig 3. MtDNA haplogroup frequencies for ancient and current populations of the Canary Islands.
Sample sizes for the ancient populations are as follows: El Hierro (n = 70), La Palma (n = 35), La Gomera (n = 57), Tenerife (n = 53), Gran Canaria (n = 87), Lanzarote and Fuerteventura combined (n = 20), and all the indigenous populations combined (n = 322). Sample sizes for the current populations: El Hierro (n = 65), La Palma (n = 87), La Gomera (n = 398), Tenerife (n = 295), Gran Canaria (n = 132), Lanzarote (n = 84), Fuerteventura (n = 67), Lanzarote and Fuerteventura combined (n = 151), and all the modern populations combined (n = 1112).
Fig 4
Fig 4. MDS plot based on haplogroup frequency distances.
A) MDS analysis comparing the individual ancient populations (FUI = Fuerteventura; GCI = Gran Canaria; GOI = La Gomera; HII = El Hierro; LAI = Lanzarote; PAI = La Palma; TFI = Tenerife), with modern Canarian (codes as in Table 1), Caucasus (CAU), North African (codes as in S2 Table), Sub-Saharan African (SSA), European (codes as in S2 Table) and Near Eastern populations (codes as in S2 Table). B) MDS analysis as in Fig 4A, but removing outliers (HII, GOI and GOM) and pooling all the remaining ancient samples together (CIP).

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References

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Grants and funding

C.D.B. and R.F. were funded by a grant from the National Science Foundation (1201234) and the Chan Zuckerberg Biohub Investigator Award; R.F. was funded by a Fundación Canaria Dr. Manuel Morales fellowship and by a grant from Dirección General de Patriomonio Cultural del Gobierno de Canarias (MITOCAN); M.A. was funded by a grant from the Spanish Ministry of Science and Innovation (HAR2015-68323-P) and by the María Rosa Alonso grant from Cabildo de Tenerife; B.S. was funded by a grant from the Gordon and Betty Moore Foundation (GBMF-3804); A.C.R.R. was funded by a grant from the Spanish Ministry of Science and Innovation (HAR2017-83205P); R.G.M., J.M.L.S and C.F. were funded by grants from the Spanish Ministry of Science and Innovation (RTC-2017-6471-1) and Área Tenerife 2030 from Cabildo de Tenerife (CGIEU0000219140), and from the agreement OA17/008 with Instituto Tecnológico y de Energías Renovables (ITER). Tibicena Arqueología y Patrimonio provided support in the form of salaries for authors V.A. and M.A.M.B. and radiocarbon dating of four archaeological samples, but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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