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Tamm E, Di Cristofaro J, Mazières S, Pennarun E, Kushniarevich A, Raveane A, Semino O, Chiaroni J, Pereira L, Metspalu M, Montinaro F. Genome-wide analysis of Corsican population reveals a close affinity with Northern and Central Italy. Sci Rep 2019; 9:13581. [PMID: 31537848 PMCID: PMC6753063 DOI: 10.1038/s41598-019-49901-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 08/31/2019] [Indexed: 01/13/2023] Open
Abstract
Despite being the fourth largest island in the Mediterranean basin, the genetic variation of Corsica has not been explored as exhaustively as Sardinia, which is situated only 11 km South. However, it is likely that the populations of the two islands shared, at least in part, similar demographic histories. Moreover, the relative small size of the Corsica may have caused genetic isolation, which, in turn, might be relevant under medical and translational perspectives. Here we analysed genome wide data of 16 Corsicans, and integrated with newly (33 individuals) and previously generated samples from West Eurasia and North Africa. Allele frequency, haplotype-based, and ancient genome analyses suggest that although Sardinia and Corsica may have witnessed similar isolation and migration events, the latter is genetically closer to populations from continental Europe, such as Northern and Central Italians.
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Affiliation(s)
- Erika Tamm
- Institute of Genomics, University of Tartu, Tartu, Estonia.
| | - Julie Di Cristofaro
- Aix Marseille Univ, CNRS, EFS, ADES, Marseille, France.,Etablissement Français du Sang PACA Corse, Biologie des Groupes Sanguins, Marseille, France
| | | | - Erwan Pennarun
- Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Alena Kushniarevich
- Institute of Genomics, University of Tartu, Tartu, Estonia.,Institute of Genetics and Cytology, National Academy of Sciences of Belarus, Minsk, 220072, Belarus
| | - Alessandro Raveane
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, Via Ferrata 9, 27100, Pavia, Italy
| | - Ornella Semino
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, Via Ferrata 9, 27100, Pavia, Italy
| | - Jacques Chiaroni
- Aix Marseille Univ, CNRS, EFS, ADES, Marseille, France.,Etablissement Français du Sang PACA Corse, Biologie des Groupes Sanguins, Marseille, France
| | - Luisa Pereira
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135, Porto, Portugal.,Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), 4200-135, Porto, Portugal
| | - Mait Metspalu
- Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Francesco Montinaro
- Institute of Genomics, University of Tartu, Tartu, Estonia. .,Department of Zoology, University of Oxford, Oxford, UK.
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2
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Leonardi M, Sandionigi A, Conzato A, Vai S, Lari M, Tassi F, Ghirotto S, Caramelli D, Barbujani G. The female ancestor's tale: Long-term matrilineal continuity in a nonisolated region of Tuscany. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 167:497-506. [PMID: 30187463 DOI: 10.1002/ajpa.23679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 05/14/2018] [Accepted: 06/19/2018] [Indexed: 12/21/2022]
Abstract
OBJECTIVES With the advent of ancient DNA analyses, it has been possible to disentangle the contribution of ancient populations to the genetic pool of the modern inhabitants of many regions. Reconstructing the maternal ancestry has often highlighted genetic continuity over several millennia, but almost always in isolated areas. Here we analyze North-western Tuscany, a region that was a corridor of exchanges between Central Italy and the Western Mediterranean coast. MATERIALS AND METHODS We newly obtained mitochondrial HVRI sequences from 28 individuals, and after gathering published data, we collected genetic information for 119 individuals from the region. Those span five periods during the last 5,000 years: Prehistory, Etruscan age, Roman age, Renaissance, and Present-day. We used serial coalescent simulations in an approximate Bayesian computation framework to test for continuity between the mentioned groups. RESULTS Our analyses always favor continuity over discontinuity for all groups considered, with the Etruscans being part of the genealogy. Moreover, the posterior distributions of the parameters support very small female effective population sizes. CONCLUSIONS The observed signals of long-term genetic continuity and isolation are in contrast with the history of the region, conquered several times (Etruscans, Romans, Lombards, and French). While the Etruscans appear as a local population, intermediate between the prehistoric and the other samples, we suggest that the other conquerors-arriving from far-had a consistent social or sex bias, hence only marginally affecting the maternal lineages. At the same time, our results show that long-term genealogical continuity is not necessarily linked to geographical isolation.
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Affiliation(s)
- Michela Leonardi
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, Ferrara, Italy
| | - Anna Sandionigi
- Dipartimento di Biologia, Università di Firenze, Florence, Italy
| | - Annalisa Conzato
- Dipartimento di Biologia, Università di Firenze, Florence, Italy
| | - Stefania Vai
- Dipartimento di Biologia, Università di Firenze, Florence, Italy
| | - Martina Lari
- Dipartimento di Biologia, Università di Firenze, Florence, Italy
| | - Francesca Tassi
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, Ferrara, Italy
| | - Silvia Ghirotto
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, Ferrara, Italy
| | - David Caramelli
- Dipartimento di Biologia, Università di Firenze, Florence, Italy
| | - Guido Barbujani
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, Ferrara, Italy
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3
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Orrù A, De Iasio S, Frederic P, Girotti M, Boano R, Sanna E. Spatial diffusion of surnames by long transhumance routes between highland and lowland: A study in Sardinia. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2018; 69:127-138. [PMID: 30017379 DOI: 10.1016/j.jchb.2018.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 06/26/2018] [Indexed: 11/24/2022]
Abstract
RIASSUNTO.
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Affiliation(s)
- A Orrù
- Department of Life Sciences and Systems Biology, University of Turin, Italy.
| | - S De Iasio
- Department of Biosciences, University of Parma, Italy
| | - P Frederic
- Department of Economics "Marco Biagi", RECent (Center for Economic Research), University of Modena, Italy
| | - M Girotti
- Department of Life Sciences and Systems Biology, University of Turin, Italy
| | - R Boano
- Department of Life Sciences and Systems Biology, University of Turin, Italy
| | - E Sanna
- Department of Environmental and Life Sciences, University of Cagliari, Italy
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4
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Ben Halim N, Hsouna S, Lasram K, Chargui M, Khemira L, Saidane R, Abdelhak S, Kefi R. Mitochondrial DNA structure of an isolated Tunisian Berber population and its relationship with Mediterranean populations. Ann Hum Biol 2018; 45:86-97. [DOI: 10.1080/03014460.2017.1414875] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Nizar Ben Halim
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
| | - Sana Hsouna
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
| | - Khaled Lasram
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
| | - Mariem Chargui
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
| | - Laaroussi Khemira
- Association de Sauvegarde de la Nature et de Protection de l’Environnement à Douiret (ASNAPED), Tunis, Tunisia
| | - Rachid Saidane
- Association de Sauvegarde de la Nature et de Protection de l’Environnement à Douiret (ASNAPED), Tunis, Tunisia
| | - Sonia Abdelhak
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
| | - Rym Kefi
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur in Tunis, Tunis, Tunisia
- University of Tunis El Manar, Tunis, Tunisia
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5
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Modi A, Tassi F, Susca RR, Vai S, Rizzi E, Bellis GD, Lugliè C, Gonzalez Fortes G, Lari M, Barbujani G, Caramelli D, Ghirotto S. Complete mitochondrial sequences from Mesolithic Sardinia. Sci Rep 2017; 7:42869. [PMID: 28256601 PMCID: PMC5335606 DOI: 10.1038/srep42869] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 01/17/2017] [Indexed: 11/09/2022] Open
Abstract
Little is known about the genetic prehistory of Sardinia because of the scarcity of pre-Neolithic human remains. From a genetic perspective, modern Sardinians are known as genetic outliers in Europe, showing unusually high levels of internal diversity and a close relationship to early European Neolithic farmers. However, how far this peculiar genetic structure extends and how it originated was to date impossible to test. Here we present the first and oldest complete mitochondrial sequences from Sardinia, dated back to 10,000 yBP. These two individuals, while confirming a Mesolithic occupation of the island, belong to rare mtDNA lineages, which have never been found before in Mesolithic samples and that are currently present at low frequencies not only in Sardinia, but in the whole Europe. Preliminary Approximate Bayesian Computations, restricted by biased reference samples for Mesolithic Sardinia (the two typed samples) and Neolithic Europe (limited to central and north European sequences), suggest that the first inhabitants of the island have had a small or negligible contribution to the present-day Sardinian population, which mainly derives its genetic diversity from continental migration into the island by Neolithic times.
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Affiliation(s)
- Alessandra Modi
- Dipartimento di Biologia, Università di Firenze, 50122 Florence, Italy
| | - Francesca Tassi
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, 44121 Ferrara, Italy
| | - Roberta Rosa Susca
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, 44121 Ferrara, Italy
| | - Stefania Vai
- Dipartimento di Biologia, Università di Firenze, 50122 Florence, Italy
| | - Ermanno Rizzi
- Fondazione Telethon, 20121 Milano, Italy.,Istituto di Tecnologie Biomediche, CNR, 20090 Segrate, Milano, Italy
| | | | - Carlo Lugliè
- LASP, Dipartimento di Storia, Beni Culturali e Territorio, Università di Cagliari, 09124 Cagliari, Italy
| | - Gloria Gonzalez Fortes
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, 44121 Ferrara, Italy
| | - Martina Lari
- Dipartimento di Biologia, Università di Firenze, 50122 Florence, Italy
| | - Guido Barbujani
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, 44121 Ferrara, Italy
| | - David Caramelli
- Dipartimento di Biologia, Università di Firenze, 50122 Florence, Italy
| | - Silvia Ghirotto
- Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, 44121 Ferrara, Italy
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6
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Kefi R, Hechmi M, Naouali C, Jmel H, Hsouna S, Bouzaid E, Abdelhak S, Beraud-Colomb E, Stevanovitch A. On the origin of Iberomaurusians: new data based on ancient mitochondrial DNA and phylogenetic analysis of Afalou and Taforalt populations. Mitochondrial DNA A DNA Mapp Seq Anal 2016; 29:147-157. [PMID: 28034339 DOI: 10.1080/24701394.2016.1258406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The Western North African population was characterized by the presence of Iberomaurusian civilization at the Epiplaeolithic period (around 20,000 years before present (YBP) to 10,000 YBP). The origin of this population is still not clear: they may come from Europe, Near East, sub-Saharan Africa or they could have evolved in situ in North Africa. With the aim to contribute to a better knowledge of the settlement of North Africa we analysed the mitochondrial DNA extracted from Iberomaurusian skeletons exhumed from the archaeological site of Afalou (AFA) (15,000-11,000 YBP) in Algeria and from the archaeological site of Taforalt (TAF) (23,000-10,800 YBP) in Morocco. Then, we carried out a phylogenetic analysis relating these Iberomaurusians to 61 current Mediterranean populations. The genetic structure of TAF and AFA specimens contains only North African and Eurasian maternal lineages. These finding demonstrate the presence of these haplotypes in North Africa from at least 20,000 YBP. The very low contribution of a Sub-Saharan African haplotype in the Iberomaurusian samples is confirmed. We also highlighted the existence of genetic flows between Southern and Northern coast of the Mediterranean.
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Affiliation(s)
- Rym Kefi
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia.,b University Tunis El Manar , Tunis , Tunisia
| | - Meriem Hechmi
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia
| | - Chokri Naouali
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia.,b University Tunis El Manar , Tunis , Tunisia
| | - Haifa Jmel
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia
| | - Sana Hsouna
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia.,b University Tunis El Manar , Tunis , Tunisia
| | - Eric Bouzaid
- c Institut National de Police Scientifique Laboratoire de Marseille , Marseille , France
| | - Sonia Abdelhak
- a Laboratory of Biomedical Genomics and Oncogenetics , Institut Pasteur de Tunis , Tunis , Tunisia.,b University Tunis El Manar , Tunis , Tunisia
| | | | - Alain Stevanovitch
- c Institut National de Police Scientifique Laboratoire de Marseille , Marseille , France
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7
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Barral-Arca R, Pischedda S, Gómez-Carballa A, Pastoriza A, Mosquera-Miguel A, López-Soto M, Martinón-Torres F, Álvarez-Iglesias V, Salas A. Meta-Analysis of Mitochondrial DNA Variation in the Iberian Peninsula. PLoS One 2016; 11:e0159735. [PMID: 27441366 PMCID: PMC4956223 DOI: 10.1371/journal.pone.0159735] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 07/07/2016] [Indexed: 12/14/2022] Open
Abstract
The Iberian Peninsula has been the focus of attention of numerous studies dealing with mitochondrial DNA (mtDNA) variation, most of them targeting the control region segment. In the present study we sequenced the control region of 3,024 Spanish individuals from areas where available data were still limited. We also compiled mtDNA haplotypes from the literature involving 4,588 sequences and 28 population groups or small regions. We meta-analyzed all these data in order to shed further light on patterns of geographic variation, taking advantage of the large sample size and geographic coverage, in contrast with the atomized sampling strategy of previous work. The results indicate that the main mtDNA haplogroups show primarily clinal geographic patterns across the Iberian geography, roughly along a North-South axis. Haplogroup HV0 (where haplogroup U is nested) is more prevalent in the Franco Cantabrian region, in good agreement with previous findings that identified this area as a climate refuge during the Last Glacial Maximum (LGM), prior to a subsequent demographic re-expansion towards Central Europe and the Mediterranean. Typical sub-Saharan and North African lineages are slightly more prevalent in South Iberia, although at low frequencies; this pattern has been shaped mainly by the transatlantic slave trade and the Arab invasion of the Iberian Peninsula. The results also indicate that summary statistics that aim to measure molecular variation, or AMOVA, have limited sensitivity to detect population substructure, in contrast to patterns revealed by phylogeographic analysis. Overall, the results suggest that mtDNA variation in Iberia is substantially stratified. These patterns might be relevant in biomedical studies given that stratification is a common cause of false positives in case-control mtDNA association studies, and should be also considered when weighting the DNA evidence in forensic casework, which is strongly dependent on haplotype frequencies.
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Affiliation(s)
- Ruth Barral-Arca
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
- GenPop Research Group, Instituto de Investigaciones Sanitarias (IDIS), Hospital Clínico Universitario de Santiago, Galicia, Spain
| | - Sara Pischedda
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
- GenPop Research Group, Instituto de Investigaciones Sanitarias (IDIS), Hospital Clínico Universitario de Santiago, Galicia, Spain
| | - Alberto Gómez-Carballa
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
- GenPop Research Group, Instituto de Investigaciones Sanitarias (IDIS), Hospital Clínico Universitario de Santiago, Galicia, Spain
- Grupo de Investigación en Genética, Vacunas, Infecciones y Pediatría (GENVIP), Hospital Clínico Universitario and Universidade de Santiago de Compostela (USC), Galicia, Spain
| | - Ana Pastoriza
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
| | - Ana Mosquera-Miguel
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
| | - Manuel López-Soto
- Servicio de Biología, Instituto Nacional de Toxicología y Ciencias Forenses, Departamento de Sevilla, Sevilla, Spain
| | - Federico Martinón-Torres
- Grupo de Investigación en Genética, Vacunas, Infecciones y Pediatría (GENVIP), Hospital Clínico Universitario and Universidade de Santiago de Compostela (USC), Galicia, Spain
- Pediatric Emergency and Critical Care Division, Department of Pediatrics, Hospital Clínico Universitario de Santiago, Santiago de Compostela, Galicia, Spain
| | - Vanesa Álvarez-Iglesias
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
| | - Antonio Salas
- Unidade de Xenética, Departamento de Anatomía Patolóxica e Ciencias Forenses, Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Galicia, Spain
- GenPop Research Group, Instituto de Investigaciones Sanitarias (IDIS), Hospital Clínico Universitario de Santiago, Galicia, Spain
- * E-mail:
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8
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Simón M, Díaz N, Solórzano E, Montiel R, Francalacci P, Malgosa A. Dissecting mitochondrial dna variability of balearic populations from the bronze age to the current era. Am J Hum Biol 2016; 29. [PMID: 27292871 DOI: 10.1002/ajhb.22883] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 05/15/2016] [Accepted: 05/17/2016] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVES To determine ancient population influences on ancient and current Balearic populations and to reconstruct their mitochondrial DNA (mtDNA) gene pool evolution. METHODS We analyzed 239 individuals belonging to five archaeological populations from Majorca and Minorca, four dating to the transition between the Bronze Age and the Iron Age, and one Late Roman Majorcan population. Six additional individuals from Santa Teresa di Gallura from the Nuragic period were characterized and added to the existing samples from that culture to make comparisons with Talaiotic populations. RESULTS We characterized the haplogroups of 138 individuals and obtained 69 sequences from mtDNA hypervariable region I. In the intra-island study, the apparent differences in social and funerary rites between two contiguous Majorcan necropolises were correlated with genetic characteristics. Also, the likely occurrence of consanguinity in a population with a very particular burial pattern was supported by genetic data. Despite the uniqueness of each necropolis, the global comparison of the five necropolises revealed no significant differences between them, or between ancient and modern populations from the islands. Ancient Balearics showed a similar mtDNA gene pool to Ancient Catalans, had a Near Eastern component, and showed continuity with European populations since at least the Bronze Age. CONCLUSION We characterized five Balearic necropolises in the context of their geographic and cultural characteristics. The similarity between ancient Balearic and ancient Catalan gene pools reinforces their known historic interactions, while the lack of a consistent genetic continuity with Ancient Sardinians suggests that Talaiotic and Nuragic cultures arose in differentiated populations. Am. J. Hum. Biol. 29:e22883, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Marc Simón
- Unitat d'Antropologia Biològica, Departament BABVE, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
| | - Nancy Díaz
- Universidad de los Andes. Avenida 3, Independencia. Edificio el Rectorado, Mérida, 5101, Venezuela
| | - Eduvigis Solórzano
- Universidad de los Andes. Avenida 3, Independencia. Edificio el Rectorado, Mérida, 5101, Venezuela
| | - Rafael Montiel
- Laboratorio Nacional de Genómica para la Biodiversidad, Unidad de Genómica Avanzada, CINVESTAV-IPN. Km. 9.6 Libramiento Norte Carretera Irapuato, Irapuato, 36821, Mexico
| | - Paolo Francalacci
- Universitá di Sassari, Piazza D'Armi, 17, Sassari, SS, 07100, Italia
| | - Assumpció Malgosa
- Unitat d'Antropologia Biològica, Departament BABVE, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
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9
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Anagnostou P, Capocasa M, Dominici V, Montinaro F, Coia V, Destro-Bisol G. Evaluating mtDNA patterns of genetic isolation using a re-sampling procedure: A case study on Italian populations. Ann Hum Biol 2016; 44:140-148. [PMID: 27109644 DOI: 10.1080/03014460.2016.1181784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND A number of studies which have investigated isolation patterns in human populations rely on the analysis of intra- and inter-population genetic statistics of mtDNA polymorphisms. However, this approach makes it difficult to differentiate between the effects of long-term genetic isolation and the random fluctuations of statistics due to reduced sample size. AIM To overcome the confounding effect of sample size when detecting signatures of genetic isolation. SUBJECTS AND METHODS A re-sampling based procedure was employed to evaluate reduction in intra-population diversity, departure from surrounding genetic background and demographic stationarity in 34 Italian populations subject to isolation factors. RESULTS Signatures of genetic isolation were detected for all three statistics in seven populations: Pusteria valley, Sappada, Sauris, Timau settled in the eastern Italian Alps and Cappadocia, Filettino and Vallepietra settled in the Appenines. However, this study was unable to find signals for any of the statistics analysed in 19 populations. Finally, eight populations showing signals of isolation were found for one or two statistics. CONCLUSION The analysis revealed that the use of population genetic statistics combined with re-sampling procedure can help detect signatures of genetic isolation in human populations, even using a single, although highly informative, locus like mtDNA.
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Affiliation(s)
- Paolo Anagnostou
- a Dipartimento di Biologia Ambientale , Sapienza University of Rome , Rome , Italy.,b Istituto Italiano di Antropologia , Rome , Italy
| | - Marco Capocasa
- b Istituto Italiano di Antropologia , Rome , Italy.,c Dipartimento di Biologia e Biotecnologie 'Charles Darwin' , Sapienza University of Rome , Rome , Italy
| | - Valentina Dominici
- a Dipartimento di Biologia Ambientale , Sapienza University of Rome , Rome , Italy
| | | | - Valentina Coia
- e Istituto per le Mummie e l'Iceman, Accademia Europea di Bolzano (EURAC-Research) , Bolzano , Italy
| | - Giovanni Destro-Bisol
- a Dipartimento di Biologia Ambientale , Sapienza University of Rome , Rome , Italy.,b Istituto Italiano di Antropologia , Rome , Italy
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10
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Messina F, Scano G, Contini I, Martínez-Labarga C, De Stefano GF, Rickards O. Linking between genetic structure and geographical distance: Study of the maternal gene pool in the Ethiopian population. Ann Hum Biol 2016; 44:53-69. [PMID: 26883569 DOI: 10.3109/03014460.2016.1155646] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Background The correlation between genetics and geographical distance has already been examined through the study of the dispersion of human populations, especially in terms of uniparental genetic markers. Aim The present work characterises, at the level of the mitochondrial DNA (mtDNA), two new samples of Amhara and Oromo populations from Ethiopia to evaluate the possible pattern of distribution for mtDNA variation and to test the hypothesis of the Isolation-by-Distance (IBD) model among African, European and Middle-Eastern populations. Subjects and methods This study analysed 173 individuals belonging to two ethnic groups of Ethiopia, Amhara and Oromo, by assaying HVS-I and HVS-II of mtDNA D-loop and informative coding region SNPs of mtDNA. Results The analysis suggests a relationship between genetic and geographic distances, affirming that the mtDNA pool of Africa, Europe and the Middle East might be coherent with the IBD model. Moreover, the mtDNA gene pools of the Sub-Saharan African and Mediterranean populations were very different. Conclusion In this study the pattern of mtDNA distribution, beginning with the Ethiopian plateau, was tested in the IBD model. It could be affirmed that, on a continent scale, the mtDNA pool of Africa, Europe and the Middle East might fall under the IBD model.
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Affiliation(s)
- Francesco Messina
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
| | - Giuseppina Scano
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
| | - Irene Contini
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
| | - Cristina Martínez-Labarga
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
| | - Gian Franco De Stefano
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
| | - Olga Rickards
- a Center of Molecular Anthropology for Ancient DNA Study, Department of Biology , University of Rome 'Tor Vergata' , Via della Ricerca Scientifica n. 1 , 00133 Rome , Italy
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11
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Rhouma FB, Messai H, Hsouna S, Halim NB, Cherif W, Fadhel SB, Tiar A, Nagara M, Azzouz H, Sfar MT, Dridi MFB, Tebib N, Ayadi A, Abdelhak S, Kefi R. History of settlement of villages from Central Tunisia by studying families sharing a common founder Glycogenosis type III mutation. Mitochondrial DNA A DNA Mapp Seq Anal 2015; 27:3194-8. [PMID: 26704523 DOI: 10.3109/19401736.2015.1007331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Glycogen storage disease type III (GSD III; Cori disease; Forbes disease) is an autosomal recessive inherited metabolic disorder resulting from deficient glycogen debrancher enzyme activity in liver and muscle. In this study, we focused on a single AGL gene mutation p.W1327X in 16 Tunisian patients from rural area surrounding the region of Mahdia in Central Tunisia. This constitutes the largest pool of patients with this mutation ever described. This study was performed to trace the history of the patients' ancestries in a single region. After extraction of genomic DNA, exon 31 of AGL gene was sequenced. The patients were investigated for the hypervariable segment 1 of mitochondrial DNA and 17 Y-STR markers. We found that the p.W1327X mutation was a founder mutation in Tunisia Analysis of maternal lineages shows an admixture of autochthonous North African, sub-Saharan and a predominance of Eurasian haplogroups. Heterogeneity of maternal haplogroups indicates an ancient settlement. However, paternal gene flow was highly homogeneous and originates from the Near East. We hypothesize that the p.W1327X mutation was introduced into the Tunisian population probably by a recent migration event; then the mutation was fixed in a small region due to the high rate of consanguineous marriages and genetic drift. The screening for this mutation should be performed in priority for GSD III molecular diagnosis, for patients from the region of Mahdia and those from regions sharing the same settlement history.
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Affiliation(s)
- Faten Ben Rhouma
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Habib Messai
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Sana Hsouna
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Nizar Ben Halim
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Wafa Cherif
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Sihem Ben Fadhel
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Afaf Tiar
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Majdi Nagara
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Hatem Azzouz
- c Département de Pédiatrie , Hôpital La Rabta de Tunis, Unité des maladies métaboliques héréditaires , Tunis , Tunisia .,d Faculté de Médecine de Tunis , Tunis , Tunisia , and
| | | | - Marie-Françoise Ben Dridi
- c Département de Pédiatrie , Hôpital La Rabta de Tunis, Unité des maladies métaboliques héréditaires , Tunis , Tunisia .,d Faculté de Médecine de Tunis , Tunis , Tunisia , and
| | - Neji Tebib
- c Département de Pédiatrie , Hôpital La Rabta de Tunis, Unité des maladies métaboliques héréditaires , Tunis , Tunisia .,d Faculté de Médecine de Tunis , Tunis , Tunisia , and
| | - Abdelkarim Ayadi
- e Département de Pédiatrie , Hôpital Tahar Sfar , Mahdia , Tunisia
| | - Sonia Abdelhak
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
| | - Rym Kefi
- a Institut Pasteur de Tunis, Laboratoire de Genomique Biomedicale et Oncogenetique LR11IPT05 , Tunis , Tunisia .,b Université Tunis El Manar , Tunis , Tunisia
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12
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Hernández CL, Soares P, Dugoujon JM, Novelletto A, Rodríguez JN, Rito T, Oliveira M, Melhaoui M, Baali A, Pereira L, Calderón R. Early Holocenic and Historic mtDNA African Signatures in the Iberian Peninsula: The Andalusian Region as a Paradigm. PLoS One 2015; 10:e0139784. [PMID: 26509580 PMCID: PMC4624789 DOI: 10.1371/journal.pone.0139784] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 09/17/2015] [Indexed: 11/18/2022] Open
Abstract
Determining the timing, identity and direction of migrations in the Mediterranean Basin, the role of "migratory routes" in and among regions of Africa, Europe and Asia, and the effects of sex-specific behaviors of population movements have important implications for our understanding of the present human genetic diversity. A crucial component of the Mediterranean world is its westernmost region. Clear features of transcontinental ancient contacts between North African and Iberian populations surrounding the maritime region of Gibraltar Strait have been identified from archeological data. The attempt to discern origin and dates of migration between close geographically related regions has been a challenge in the field of uniparental-based population genetics. Mitochondrial DNA (mtDNA) studies have been focused on surveying the H1, H3 and V lineages when trying to ascertain north-south migrations, and U6 and L in the opposite direction, assuming that those lineages are good proxies for the ancestry of each side of the Mediterranean. To this end, in the present work we have screened entire mtDNA sequences belonging to U6, M1 and L haplogroups in Andalusians--from Huelva and Granada provinces--and Moroccan Berbers. We present here pioneer data and interpretations on the role of NW Africa and the Iberian Peninsula regarding the time of origin, number of founders and expansion directions of these specific markers. The estimated entrance of the North African U6 lineages into Iberia at 10 ky correlates well with other L African clades, indicating that U6 and some L lineages moved together from Africa to Iberia in the Early Holocene. Still, founder analysis highlights that the high sharing of lineages between North Africa and Iberia results from a complex process continued through time, impairing simplistic interpretations. In particular, our work supports the existence of an ancient, frequently denied, bridge connecting the Maghreb and Andalusia.
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Affiliation(s)
- Candela L. Hernández
- Departamento de Zoología y Antropología Física, Facultad de Biología, Universidad Complutense, Madrid, Spain
| | - Pedro Soares
- Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Porto, Portugal
- CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Braga, Portugal
| | - Jean M. Dugoujon
- CNRS UMR 5288 Laboratoire d’Anthropologie Moléculaire et d’Imagerie de Synthèse (AMIS), Université Paul Sabatier Toulouse III, 31073 Toulouse, France
| | - Andrea Novelletto
- Dipartimento di Biologia, Università Tor Vergata di Rome, Rome, Italy
| | | | - Teresa Rito
- Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Porto, Portugal
| | - Marisa Oliveira
- Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Porto, Portugal
| | | | - Abdellatif Baali
- Faculté des Sciences Semlalia de Marrakech (FSSM), Université Cadi Ayyad, Marrakech, Morocco
| | - Luisa Pereira
- Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Faculdade de Medicina da Universidade do Porto, Porto, Portugal
| | - Rosario Calderón
- Departamento de Zoología y Antropología Física, Facultad de Biología, Universidad Complutense, Madrid, Spain
- * E-mail:
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13
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Santana J, Fregel R, Lightfoot E, Morales J, Alamón M, Guillén J, Moreno M, Rodríguez A. The early colonial atlantic world: New insights on the African Diaspora from isotopic and ancient DNA analyses of a multiethnic 15th-17th century burial population from the Canary Islands, Spain. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2015; 159:300-12. [DOI: 10.1002/ajpa.22879] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 09/09/2015] [Accepted: 09/21/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Jonathan Santana
- State University of Peninsula de Santa Elena; La Libertad Ecuador
- G.I. Tarha. Deparment of Historical Sciences; Las Palmas de Gran Canaria Spain
| | - Rosa Fregel
- Department of Genetics; Stanford University; Stanford United States of America
| | | | | | | | | | | | - Amelia Rodríguez
- G.I. Tarha. Deparment of Historical Sciences; Las Palmas de Gran Canaria Spain
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14
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Hsouna S, Ben Halim N, Lasram K, Meiloud G, Arfa I, Kerkeni E, Romdhane L, Jamoussi H, Bahri S, Ben Ammar S, Abid A, Barakat A, Houmeida A, Abdelhak S, Kefi R. Study of the T16189C variant and mitochondrial lineages in Tunisian and overall Mediterranean region. Mitochondrial DNA A DNA Mapp Seq Anal 2015; 27:1558-63. [PMID: 25208176 DOI: 10.3109/19401736.2014.953136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The mitochondrial DNA (mtDNA) variant T16189C has been investigated in several metabolic diseases. In this study, we aimed to estimate the frequency of the T16189C variant in Tunisian and other Mediterranean populations and to evaluate the impact of this variant on the phylogeny of Mediterranean populations. Blood sample of 240 unrelated Tunisian subjects were recruited from several Tunisian localities. The hypervariable region 1 of the mtDNA were amplified and sequenced. Additional sequences (N = 4921) from Mediterranean populations were compiled from previous studies. The average frequency of T16189C variant in Tunisia (29%) is similar to that observed in North African and Near Eastern populations. Our findings showed positive correlation of the T16189C variant with Sub-Saharan and North African lineages, while a negative correlation was found with the Eurasian haplogroups, reaching its maximum with the Eurasian haplogroup H. The principal component analyses showed a high internal heterogeneity between Tunisian localities. At the Mediterranean scale, Tunisians are closer to North African (Algerian and Moroccan) and Near Eastern populations (Syrians and Palestinians) than to Europeans.
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Affiliation(s)
- Sana Hsouna
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Nizar Ben Halim
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Khaled Lasram
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Ghlana Meiloud
- b Laboratoire de Biochimie et Biologie Moléculaire , Faculté des Sciences et Techniques , Nouakchott , Mauritania
| | - Imen Arfa
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Emna Kerkeni
- c Genetics Laboratory, Faculté de Médecine de Monastir , Monastir , Tunisia
| | - Lilia Romdhane
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Henda Jamoussi
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Sonia Bahri
- e Department of Biochemistry , Institut Pasteur de Tunis , Tunis , Tunisia , and
| | - Slim Ben Ammar
- e Department of Biochemistry , Institut Pasteur de Tunis , Tunis , Tunisia , and
| | - Abdelmajid Abid
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia .,d Service de Consultation Externe et Exploration Fonctionnelle, Institut National de Nutrition , Tunis , Tunisia
| | - Abdelhamid Barakat
- f Laboratoire de Génétique Moléculaire Humaine, Département de Recherche Scientifique , Institut Pasteur du Maroc , Casablanca , Morocco
| | - Ahmed Houmeida
- b Laboratoire de Biochimie et Biologie Moléculaire , Faculté des Sciences et Techniques , Nouakchott , Mauritania
| | - Sonia Abdelhak
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
| | - Rym Kefi
- a Biomedical Genomics and Oncogenetics laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia
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15
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Fortes-Lima C, Dugoujon JM, Hernández CL, Reales G, Calderón R. Immunoglobulin genes in Andalusia (Spain). Genetic diversity in the Mediterranean space. C R Biol 2014; 337:646-56. [PMID: 25444709 DOI: 10.1016/j.crvi.2014.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 07/15/2014] [Accepted: 08/13/2014] [Indexed: 11/29/2022]
Abstract
Andalusia is the most densely populated region of Spain since ancient times, and has a rich history of contacts across the Mediterranean. Earlier studies have underlined the relatively high frequency of the Sub-Saharan GM 1,17 5* haplotype in western Andalusia (Huelva province, n=252) and neighbouring Atlantic regions. Here, we provide novel data on GM/KM markers in eastern Andalusians (n=195) from Granada province, where African GM*1,17 5* frequency is relatively high (0.044). The most frequent GM haplotypes in Andalusia parallel the most common in Europe. Altogether, these data allow us to gain insight into the genetic diversity of southern Iberia. Additionally, we assess population structure by comparing our Iberian samples with 41 Mediterranean populations. GM haplotype variation across the Mediterranean reflects intense and complex interactions between North Africans and South Europeans along human history, highlighting that African influence over the Iberian Peninsula does not follow an isotropic pattern.
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Affiliation(s)
- César Fortes-Lima
- Laboratoire D'Anthropologie Moléculaire et Imagerie de Synthèse, UMR 5288, Centre National de la Recherche Scientifique (CNRS), Université Toulouse-3-Paul-Sabatier, Toulouse, France
| | - Jean-Michel Dugoujon
- Laboratoire D'Anthropologie Moléculaire et Imagerie de Synthèse, UMR 5288, Centre National de la Recherche Scientifique (CNRS), Université Toulouse-3-Paul-Sabatier, Toulouse, France.
| | - Candela L Hernández
- Departamento de Zoología y Antropología Física, Facultad de Biología, Universidad Complutense, Madrid, Spain
| | - Guillermo Reales
- Departamento de Zoología y Antropología Física, Facultad de Biología, Universidad Complutense, Madrid, Spain
| | - Rosario Calderón
- Departamento de Zoología y Antropología Física, Facultad de Biología, Universidad Complutense, Madrid, Spain.
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16
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Sardinians genetic background explained by runs of homozygosity and genomic regions under positive selection. PLoS One 2014; 9:e91237. [PMID: 24651212 PMCID: PMC3961211 DOI: 10.1371/journal.pone.0091237] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 02/10/2014] [Indexed: 11/19/2022] Open
Abstract
The peculiar position of Sardinia in the Mediterranean sea has rendered its population an interesting biogeographical isolate. The aim of this study was to investigate the genetic population structure, as well as to estimate Runs of Homozygosity and regions under positive selection, using about 1.2 million single nucleotide polymorphisms genotyped in 1077 Sardinian individuals. Using four different methods--fixation index, inflation factor, principal component analysis and ancestry estimation--we were able to highlight, as expected for a genetic isolate, the high internal homogeneity of the island. Sardinians showed a higher percentage of genome covered by RoHs>0.5 Mb (F(RoH%0.5)) when compared to peninsular Italians, with the only exception of the area surrounding Alghero. We furthermore identified 9 genomic regions showing signs of positive selection and, we re-captured many previously inferred signals. Other regions harbor novel candidate genes for positive selection, like TMEM252, or regions containing long non coding RNA. With the present study we confirmed the high genetic homogeneity of Sardinia that may be explained by the shared ancestry combined with the action of evolutionary forces.
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17
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Bachis V, Calò CM, Vona G, Corrias L, Carreras-Torres R, Moral P. Analysis of 16 STRs of NOS gene regions and around in six sardinian populations (Italy). Am J Hum Biol 2014; 26:401-6. [DOI: 10.1002/ajhb.22533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 02/12/2014] [Accepted: 02/14/2014] [Indexed: 01/09/2023] Open
Affiliation(s)
- Valeria Bachis
- Department of Science of Life and Environment; University of Cagliari; Monserrato 09042 Italy
| | - Carla Maria Calò
- Department of Science of Life and Environment; University of Cagliari; Monserrato 09042 Italy
| | - Giuseppe Vona
- Department of Science of Life and Environment; University of Cagliari; Monserrato 09042 Italy
| | - Laura Corrias
- Department of Science of Life and Environment; University of Cagliari; Monserrato 09042 Italy
| | - Robert Carreras-Torres
- Department of Animal Biology and Anthropology; Institute of Biodiversity; University of Barcelona; Barcelona 08028 Spain
| | - Pedro Moral
- Department of Animal Biology and Anthropology; Institute of Biodiversity; University of Barcelona; Barcelona 08028 Spain
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18
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Kefi R, Hsouna S, Ben Halim N, Lasram K, Romdhane L, Messai H, Abdelhak S. Phylogeny and genetic structure of Tunisians and their position within Mediterranean populations. ACTA ACUST UNITED AC 2014; 26:593-604. [PMID: 24491098 DOI: 10.3109/19401736.2013.879649] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Tunisia is located at the crossroads of Europe, the Middle East and Sub-Saharan Africa. This position might lead to numerous waves of migrations, contributing to the current genetic landscape of Tunisians. In this study, we analyzed 815 mitochondrial DNA (mtDNA) sequences from Tunisia in order to characterize the mitochondrial DNA genetic structure of this region, to construct the processes for its composition and to compare it to other Mediterranean populations. To that end, additional 4206 mtDNA sequences were compiled from previous studies performed in African (1237), Near Eastern (231) and European (2738) populations. Both phylogenetic and statistical analyses were performed. This study confirmed the mosaic genetic structure of the Tunisian population with the predominance of the Eurasian lineages, followed by the Sub-Saharan and North African lineages. Among Tunisians, the highest haplogroup and haplotype diversity were observed in particular in the Capital Tunis. No significant differentiation was observed between both geographical (Northern versus Southern Tunisia) and different ethnic groups in Tunisia. Our results highlight the presence of outliers and most frequent unique sequences in Tunisia (10.2%) compared to 45 Mediterranean populations. Phylogenetic analysis showed that the majority of Tunisian localities were closer to North Africans and Near Eastern populations than to Europeans. The exception was found for Berbers from Jerba which are clustered with Sardinians and Valencians.
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Affiliation(s)
- Rym Kefi
- Biomedical Genomics and Oncogenetics Laboratory (LR 11 IPT 05), Institut Pasteur de Tunis, Université El Manar de Tunis , Tunis , Tunisia and
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19
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Bekada A, Fregel R, Cabrera VM, Larruga JM, Pestano J, Benhamamouch S, González AM. Introducing the Algerian mitochondrial DNA and Y-chromosome profiles into the North African landscape. PLoS One 2013; 8:e56775. [PMID: 23431392 PMCID: PMC3576335 DOI: 10.1371/journal.pone.0056775] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 01/15/2013] [Indexed: 11/18/2022] Open
Abstract
North Africa is considered a distinct geographic and ethnic entity within Africa. Although modern humans originated in this Continent, studies of mitochondrial DNA (mtDNA) and Y-chromosome genealogical markers provide evidence that the North African gene pool has been shaped by the back-migration of several Eurasian lineages in Paleolithic and Neolithic times. More recent influences from sub-Saharan Africa and Mediterranean Europe are also evident. The presence of East-West and North-South haplogroup frequency gradients strongly reinforces the genetic complexity of this region. However, this genetic scenario is beset with a notable gap, which is the lack of consistent information for Algeria, the largest country in the Maghreb. To fill this gap, we analyzed a sample of 240 unrelated subjects from a northwest Algeria cosmopolitan population using mtDNA sequences and Y-chromosome biallelic polymorphisms, focusing on the fine dissection of haplogroups E and R, which are the most prevalent in North Africa and Europe respectively. The Eurasian component in Algeria reached 80% for mtDNA and 90% for Y-chromosome. However, within them, the North African genetic component for mtDNA (U6 and M1; 20%) is significantly smaller than the paternal (E-M81 and E-V65; 70%). The unexpected presence of the European-derived Y-chromosome lineages R-M412, R-S116, R-U152 and R-M529 in Algeria and the rest of the Maghreb could be the counterparts of the mtDNA H1, H3 and V subgroups, pointing to direct maritime contacts between the European and North African sides of the western Mediterranean. Female influx of sub-Saharan Africans into Algeria (20%) is also significantly greater than the male (10%). In spite of these sexual asymmetries, the Algerian uniparental profiles faithfully correlate between each other and with the geography.
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Affiliation(s)
- Asmahan Bekada
- Department of Biotechnology, Faculty of Sciences, University of Oran, Oran, Algeria
| | - Rosa Fregel
- Department of Genetics, Faculty of Biology, University of La Laguna, La Laguna, Tenerife, Spain
- Department of Genetics, Faculty of Medicine, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Gran Canaria, Spain
- Forensic Genetics Laboratory, Institute of Legal Medicine of Las Palmas, Las Palmas de Gran Canaria, Gran Canaria, Spain
| | - Vicente M. Cabrera
- Department of Genetics, Faculty of Biology, University of La Laguna, La Laguna, Tenerife, Spain
| | - José M. Larruga
- Department of Genetics, Faculty of Biology, University of La Laguna, La Laguna, Tenerife, Spain
| | - José Pestano
- Department of Genetics, Faculty of Medicine, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Gran Canaria, Spain
- Forensic Genetics Laboratory, Institute of Legal Medicine of Las Palmas, Las Palmas de Gran Canaria, Gran Canaria, Spain
| | - Soraya Benhamamouch
- Department of Biotechnology, Faculty of Sciences, University of Oran, Oran, Algeria
| | - Ana M. González
- Department of Genetics, Faculty of Biology, University of La Laguna, La Laguna, Tenerife, Spain
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Brisighelli F, Álvarez-Iglesias V, Fondevila M, Blanco-Verea A, Carracedo Á, Pascali VL, Capelli C, Salas A. Uniparental markers of contemporary Italian population reveals details on its pre-Roman heritage. PLoS One 2012; 7:e50794. [PMID: 23251386 PMCID: PMC3519480 DOI: 10.1371/journal.pone.0050794] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Accepted: 10/24/2012] [Indexed: 11/18/2022] Open
Abstract
Background According to archaeological records and historical documentation, Italy has been a melting point for populations of different geographical and ethnic matrices. Although Italy has been a favorite subject for numerous population genetic studies, genetic patterns have never been analyzed comprehensively, including uniparental and autosomal markers throughout the country. Methods/Principal Findings A total of 583 individuals were sampled from across the Italian Peninsula, from ten distant (if homogeneous by language) ethnic communities — and from two linguistic isolates (Ladins, Grecani Salentini). All samples were first typed for the mitochondrial DNA (mtDNA) control region and selected coding region SNPs (mtSNPs). This data was pooled for analysis with 3,778 mtDNA control-region profiles collected from the literature. Secondly, a set of Y-chromosome SNPs and STRs were also analyzed in 479 individuals together with a panel of autosomal ancestry informative markers (AIMs) from 441 samples. The resulting genetic record reveals clines of genetic frequencies laid according to the latitude slant along continental Italy – probably generated by demographical events dating back to the Neolithic. The Ladins showed distinctive, if more recent structure. The Neolithic contribution was estimated for the Y-chromosome as 14.5% and for mtDNA as 10.5%. Y-chromosome data showed larger differentiation between North, Center and South than mtDNA. AIMs detected a minor sub-Saharan component; this is however higher than for other European non-Mediterranean populations. The same signal of sub-Saharan heritage was also evident in uniparental markers. Conclusions/Significance Italy shows patterns of molecular variation mirroring other European countries, although some heterogeneity exists based on different analysis and molecular markers. From North to South, Italy shows clinal patterns that were most likely modulated during Neolithic times.
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Affiliation(s)
- Francesca Brisighelli
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
- Forensic Genetics Laboratory, Institute of Legal Medicine, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Zoology, University of Oxford, Oxford, United Kingdom
| | - Vanesa Álvarez-Iglesias
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
| | - Manuel Fondevila
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
| | - Alejandro Blanco-Verea
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
| | - Ángel Carracedo
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
- Fundación Pública Galega de Medicina Xenómica (FPGMX-SERGAS), CIBER enfermedades raras, Santiago de Compostela, Galicia, Spain
| | - Vincenzo L. Pascali
- Forensic Genetics Laboratory, Institute of Legal Medicine, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Cristian Capelli
- Department of Zoology, University of Oxford, Oxford, United Kingdom
| | - Antonio Salas
- Unidade de Xenética, Facultade de Medicina, Instituto de Medicina Legal, Universidade de Santiago de Compostela, Galicia, Spain
- * E-mail:
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Robledo R, Corrias L, Bachis V, Puddu N, Mameli A, Vona G, Calò CM. Analysis of a Genetic Isolate: The Case of Carloforte (Italy). Hum Biol 2012; 84:735-54. [DOI: 10.3378/027.084.0602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/15/2013] [Indexed: 01/19/2023]
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Calò CM, Corrias L, Vona G, Bachis V, Robledo R. Sampling strategies in a linguistic isolate: results from mtDNA analysis. Am J Hum Biol 2012; 24:192-4. [PMID: 22287111 DOI: 10.1002/ajhb.22215] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 10/03/2011] [Accepted: 11/22/2011] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVES Sampling strategies are crucial issues in population genetics and anthropological studies. The sampling choice is related to the research question and the type of markers used. In this research, we compared two different sampling strategies in the Sardinian linguistic isolate of Carloforte (Italy). METHODS A first sampling (N = 49) was carried out through grandparents criterion: individuals selected for the study were born and resident in Carloforte, and unrelated for at least three generations. A second sampling (N = 50) was based on founders surnames (FS): selected participants were proved to be descendants of the village founders, and to have no ancestors in common, at least up to the grandparental generation. RESULTS The group selected through FS showed a greater gene diversity, which was confirmed by both network and haplogroup analysis. Among the shared haplogroups, we find clear differences in their frequencies. Sampling through grandparents criterion showed essentially the same haplogroups found in Sardinia, and with similar frequencies. Interesting results came from genetic tree. The FS sampling clustered with Northern African populations and it is located very far from Italian and Sardinian populations, whereas the grandparents criterion sampling clustered with Italian populations and it is located close to the other Sardinian populations. CONCLUSIONS Results showed that different sampling strategies can lead to contrasting results. As sampling through grandparents criterion is influenced by recent gene flow, we hypothesize that the difference observed with the two sampling strategies is due to the merging of Carloforte with Sardinian populations.
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Affiliation(s)
- Carla Maria Calò
- Department of Experimental Biology, University of Cagliari, 09042 Monserrato, Italy
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History, geography and population structure influence the distribution and heritability of blood and anthropometric quantitative traits in nine Sardinian genetic isolates. Genet Res (Camb) 2010; 92:199-208. [PMID: 20667164 DOI: 10.1017/s001667231000025x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Isolated founder populations which exhibit great genetic and environmental homogeneity provide an attractive setting for the study of quantitative traits (QTs). Geneticists have repeatedly turned to population isolates and the past successes have prompted increased interest among medical researchers. We studied nine small isolated villages of a secluded area of Sardinia (Ogliastra), all of them characterized by a few founders, high endogamy rates, slow population expansion and a distinct genetic makeup. Anthropometric and blood parameters, 43 QTs in all, were analysed in about 9000 voluntary subjects for whom extended genealogical information was available. We explored the distribution and examined mean differences of each trait among villages by analysis of variance (ANOVA). A heritability analysis with the variance component (VC) method was performed. Results show significant differences in the distribution of most traits between groups of villages located in two distinct geographical areas already identified by a previous population structure analysis, thus supporting the existence of differentiation among sub-populations in the same region. Heritability estimates range between 30 and 89%, demonstrating that genetic effects substantially contribute to phenotypic variation of all investigated traits and that this population provides excellent research conditions for gene-mapping projects. Results suggest that history, geographic location and population structure may have influenced the genetic and phenotypic features of these isolates. Our findings may be useful for the ongoing linkage and association studies in these isolates and suggest that a thorough characterization of population is valuable to better identify genes or variants that may be rare in the population at large and peculiar to single villages.
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Craniofacial morphometric variation and the biological history of the peopling of Sardinia. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2010; 61:385-412. [PMID: 20979998 DOI: 10.1016/j.jchb.2010.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Accepted: 07/17/2010] [Indexed: 11/22/2022]
Abstract
The aim of this work is to explore the pattern of craniofacial morphometric variation and the relationships among five prehistoric Sardinian groups dated from Late Neolithic to the Nuragic Period (Middle and Late Bronze Age), in order to formulate hypotheses on the peopling history of Sardinia. Biological relationships with coeval populations of central peninsular Italy were also analysed to detect influences from and towards extra-Sardinian sources. Furthermore, comparison with samples of contemporary populations from Sardinia and from continental Italy provided an indication of the trend leading to the final part of the peopling history. Finally, Upper Palaeolithic and Mesolithic samples were included in the analyses to compare the prehistoric Sardinians with some of their potential continental ancestors. The analysis is based on multivariate techniques including Mahalanobis D(2) distance, non-parametric multidimensional scaling (MDS) and principal component analysis (PCA). The results showed the tendency to progressive differentiation between Sardinian groups and peninsular Italian groups, with the possible exception of a discontinuity showed by the Bonnànaro (Early Bronze Age) Sardinian sample. Several aspects of the morphological results were found to agree with the current genetic evidence available for the present-day Sardinian population and a Nuragic sample: (1) biological divergence between the Sardinian and peninsular Italian populations; (2) similarity/continuity among Neolithic, Bronze Age and recent Sardinians; (3) biological separation between the Nuragic and Etruscan populations; (4) contribution of a Palaeo-Mesolithic gene pool to the genetic structure of current Sardinians.
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Piras I, Falchi A, Moral P, Paoli G, Calò CM, Vona G, Varesi L. A gradient of NOS1 overproduction alleles in European and Mediterranean populations. Genet Test Mol Biomarkers 2010; 14:673-6. [PMID: 20818978 DOI: 10.1089/gtmb.2010.0041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
AIM A (CA)n repeat located in the 3' UTR region of exon 29 of the NOS1 gene (encoding for neuronal nitric oxide synthase) has been shown to affect the size of mRNA. NOS1 mRNA is highly diverse, contributing to changes in transcript generation, degradation, processing, or subcellular targeting. In the present work, we analyzed allele frequencies of this (CA)n repeat in nine populations of the Mediterranean area and Middle Europe. We aimed at testing the presence of a north-south positive gradient of frequencies of ≤17 allele repeats, compatible with the hypothesis of positive selection suggested in two of our previous works, related to the past prevalence of malaria infection in Europe. RESULTS Results show significant negative correlations of latitude with frequencies of alleles S and genotypes S/S and S/L (p < 0.01). CONCLUSIONS In conclusion, the north-south gradient of S alleles found in the present work would confirm our previous observation about the NOS1 gene, reinforcing the hypothesis of a selective action of malaria infection. This hypothesis is strengthened by the role of nitric oxide in the immunity system.
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Affiliation(s)
- Ignazio Piras
- Faculty of Science, University of Corsica, Corsica, France.
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Messina F, Scorrano G, Labarga CM, Rolfo MF, Rickards O. Mitochondrial DNA variation in an isolated area of Central Italy. Ann Hum Biol 2010; 37:385-402. [PMID: 20377493 DOI: 10.3109/03014461003720304] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND The genetic variation in Italy is the result of ancient population movement, demographic change, and geography. The increasing possibility of studying the maternal genetic structure of selected Italian population samples at a high level of phylogenetic resolution provides a particularly useful model to assess the presence of genetic traces of the ancient people who lived in Italy in pre-Roman times in present populations AIM In this study we reconstructed the genetic maternal history of Jenne and Vallepietra, two mountain communities in the Aniene Valley in the Simbruini Mountains near Rome. Both communities have been spared external invasion due to their geographic location, which very likely preserved the genetic pool of these autochthonous populations. SUBJECTS AND METHODS The study population (124 individuals from Jenne and Vallepietra) were investigated for D-loop mtDNA hypervariable segments I (HVS-I) and II (HVS-II) and for informative single nucleotide polymorphisms (SNPs) within the coding region. The detected haplotypes were then compared with those of other Italian, European and Mediterranean populations. RESULTS The distribution of mtDNA diversity in Jenne and Vallepietra, although similar to that found in other European populations, shows a basic variability and the typical signs of a certain degree of isolation between them and other populations analysed; in particular, the Vallepietra sample showed an unusually high frequency (71.3%) of mtDNA haplogroups which are typical of Near Eastern and South-Western Asian populations. CONCLUSION The high degree of differentiation between the two villages is intriguing, since it suggests a low level of gene flow between them, despite their close geographic proximity and shared linguistic features. The degree of their genetic isolation, also in comparison to other Italian, European and Mediterranean populations, is consistent with isolation among geographically separated populations.
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Affiliation(s)
- Francesco Messina
- Dipartimento di Biologia, Università di Roma Tor Vergata, Via della Ricerca Scientifica n. 1, 00173 Rome, Italy
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Currat M, Poloni ES, Sanchez-Mazas A. Human genetic differentiation across the Strait of Gibraltar. BMC Evol Biol 2010; 10:237. [PMID: 20682051 PMCID: PMC3020631 DOI: 10.1186/1471-2148-10-237] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Accepted: 08/03/2010] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The Strait of Gibraltar is a crucial area in the settlement history of modern humans because it represents a possible connection between Africa and Europe. So far, genetic data were inconclusive about the fact that this strait constitutes a barrier to gene flow, as previous results were highly variable depending on the genetic locus studied. The present study evaluates the impact of the Gibraltar region in reducing gene flow between populations from North-Western Africa and South-Western Europe, by comparing formally various genetic loci. First, we compute several statistics of population differentiation. Then, we use an original simulation approach in order to infer the most probable evolutionary scenario for the settlement of the area, taking into account the effects of both demography and natural selection at some loci. RESULTS We show that the genetic patterns observed today in the region of the Strait of Gibraltar may reflect an ancient population genetic structure which has not been completely erased by more recent events such as Neolithic migrations. Moreover, the differences observed among the loci (i.e. a strong genetic boundary revealed by the Y-chromosome polymorphism and, at the other extreme, no genetic differentiation revealed by HLA-DRB1 variation) across the strait suggest specific evolutionary histories like sex-mediated migration and natural selection. By considering a model of balancing selection for HLA-DRB1, we here estimate a coefficient of selection of 2.2% for this locus (although weaker in Europe than in Africa), which is in line with what was estimated from synonymous versus non-synonymous substitution rates. Selection at this marker thus appears strong enough to leave a signature not only at the DNA level, but also at the population level where drift and migration processes were certainly relevant. CONCLUSIONS Our multi-loci approach using both descriptive analyses and Bayesian inferences lead to better characterize the role of the Strait of Gibraltar in the evolution of modern humans. We show that gene flow across the Strait of Gibraltar occurred at relatively high rates since pre-Neolithic times and that natural selection and sex-bias migrations distorted the demographic signal at some specific loci of our genome.
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Affiliation(s)
- Mathias Currat
- Laboratory of Anthropology, Genetics and Peopling history (AGP), Department of Anthropology, University of Geneva, Geneva, Switzerland.
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Rhouda T, Martínez-Redondo D, Gómez-Durán A, Elmtili N, Idaomar M, Díez-Sánchez C, Montoya J, López-Pérez MJ, Ruiz-Pesini E. Moroccan mitochondrial genetic background suggests prehistoric human migrations across the Gibraltar Strait. Mitochondrion 2009; 9:402-7. [PMID: 19631765 DOI: 10.1016/j.mito.2009.07.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 07/08/2009] [Accepted: 07/17/2009] [Indexed: 11/24/2022]
Abstract
Migrations into Africa from the Levant have greatly determined the mitochondrial genetic landscape of North Africa. After analyzing samples from North Morocco to Spain, we show that three fourths of the Moroccan individuals belong to Western Eurasian haplogroups and the frequencies of these are much more similar to those of the Iberian Peninsula than to those of the Middle East. This is particularly true for the mitochondrial haplogroups H1, H3 and V, which experienced a late-glacial expansion from this region, that repopulated much of Central and Northern Europe. Iberian Peninsula was also a source for prehistoric migrations to North Africa.
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Affiliation(s)
- Taha Rhouda
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, Spain.
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Pistis G, Piras I, Pirastu N, Persico I, Sassu A, Picciau A, Prodi D, Fraumene C, Mocci E, Manias MT, Atzeni R, Cosso M, Pirastu M, Angius A. High differentiation among eight villages in a secluded area of Sardinia revealed by genome-wide high density SNPs analysis. PLoS One 2009; 4:e4654. [PMID: 19247500 PMCID: PMC2646134 DOI: 10.1371/journal.pone.0004654] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Accepted: 01/29/2009] [Indexed: 01/21/2023] Open
Abstract
To better design association studies for complex traits in isolated populations it's important to understand how history and isolation moulded the genetic features of different communities. Population isolates should not “a priori” be considered homogeneous, even if the communities are not distant and part of a small region. We studied a particular area of Sardinia called Ogliastra, characterized by the presence of several distinct villages that display different history, immigration events and population size. Cultural and geographic isolation characterized the history of these communities. We determined LD parameters in 8 villages and defined population structure through high density SNPs (about 360 K) on 360 unrelated people (45 selected samples from each village). These isolates showed differences in LD values and LD map length. Five of these villages show high LD values probably due to their reduced population size and extreme isolation. High genetic differentiation among villages was detected. Moreover population structure analysis revealed a high correlation between genetic and geographic distances. Our study indicates that history, geography and biodemography have influenced the genetic features of Ogliastra communities producing differences in LD and population structure. All these data demonstrate that we can consider each village an isolate with specific characteristics. We suggest that, in order to optimize the study design of complex traits, a thorough characterization of genetic features is useful to identify the presence of sub-populations and stratification within genetic isolates.
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Affiliation(s)
- Giorgio Pistis
- Istituto di Genetica delle Popolazioni, CNR, Alghero, Sassari, Italy
| | | | | | - Ivana Persico
- Istituto di Genetica delle Popolazioni, CNR, Alghero, Sassari, Italy
| | | | | | | | | | | | | | | | | | - Mario Pirastu
- Istituto di Genetica delle Popolazioni, CNR, Alghero, Sassari, Italy
- Shardna Life Sciences, Pula, Cagliari, Italy
| | - Andrea Angius
- Istituto di Genetica delle Popolazioni, CNR, Alghero, Sassari, Italy
- Shardna Life Sciences, Pula, Cagliari, Italy
- * E-mail:
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Abstract
The origin of the Etruscans (the present day Tuscany, Italy), one of the most enigmatic non-Indo-European civilizations, is under intense controversy. We found novel genetic evidences on the mitochondrial DNA (mtDNA) establishing a genetic link between Anatolia and the ancient Etruria. By way of complete mtDNA genome sequencing of a novel autochthonous Tuscan branch of haplogroup U7 (namely U7a2a), we have estimated an historical time frame for the arrival of Anatolian lineages to Tuscany ranging from 1.1+/-0.1 to 2.3+/-0.4 kya B.P.
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Piras I, Falchi A, Moral P, Melis A, Giovannoni L, Paoli G, Calò C, Vona G, Varesi L. Frequencies of promoter pentanucleotide (TTTTA)n of CYP11A gene in European and North African populations. ACTA ACUST UNITED AC 2008; 12:93-6. [PMID: 18307388 DOI: 10.1089/gte.2007.0060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The present work attempts to determine the distribution of CYP11A (TTTTA)n genotype and allele frequencies in 10 European and North African populations. This polymorphism has been associated with hyperandrogenism by several association studies. To our knowledge, this is the first study investigating the ethnic variation of this polymorphism. DNA was extracted from 868 whole-blood samples with the standard phenol-chloroform technique, and PCR reactions were carried out using fluorescent primers as described previously. PCR products were analyzed by an ABI 3,730 DNA Analyzer. A total of six alleles were identified, ranging from 220 bp (4 repeats [4R]) to 250 bp (10R). The most frequent allelic fragment size in all populations was 4R, with frequencies ranging from 47.9% (Sicily) to 62.8% (Tuscany and Germany). Allelic frequencies showed high heterogeneity between analyzed populations. We detected a significant gradient for alleles 4R and 8R. In this study, we report the allele frequency distribution of CYP11A (TTTTA)n showing a north-south geographic gradient. This result could be useful for epidemiological studies about hyperandrogenism.
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Affiliation(s)
- Ignazio Piras
- Department of Experimental Biology, University of Cagliari, Cagliari, Italy
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Tomas C, Sanchez JJ, Barbaro A, Brandt-Casadevall C, Hernandez A, Ben Dhiab M, Ramon M, Morling N. X-chromosome SNP analyses in 11 human Mediterranean populations show a high overall genetic homogeneity except in North-west Africans (Moroccans). BMC Evol Biol 2008; 8:75. [PMID: 18312628 PMCID: PMC2315647 DOI: 10.1186/1471-2148-8-75] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Accepted: 02/29/2008] [Indexed: 11/20/2022] Open
Abstract
Background Due to its history, with a high number of migration events, the Mediterranean basin represents a challenging area for population genetic studies. A large number of genetic studies have been carried out in the Mediterranean area using different markers but no consensus has been reached on the genetic landscape of the Mediterranean populations. In order to further investigate the genetics of the human Mediterranean populations, we typed 894 individuals from 11 Mediterranean populations with 25 single-nucleotide polymorphisms (SNPs) located on the X-chromosome. Results A high overall homogeneity was found among the Mediterranean populations except for the population from Morocco, which seemed to differ genetically from the rest of the populations in the Mediterranean area. A very low genetic distance was found between populations in the Middle East and most of the western part of the Mediterranean Sea. A higher migration rate in females versus males was observed by comparing data from X-chromosome, mt-DNA and Y-chromosome SNPs both in the Mediterranean and a wider geographic area. Multilocus association was observed among the 25 SNPs on the X-chromosome in the populations from Ibiza and Cosenza. Conclusion Our results support both the hypothesis of (1) a reduced impact of the Neolithic Wave and more recent migration movements in NW-Africa, and (2) the importance of the Strait of Gibraltar as a geographic barrier. In contrast, the high genetic homogeneity observed in the Mediterranean area could be interpreted as the result of the Neolithic wave caused by a large demic diffusion and/or more recent migration events. A differentiated contribution of males and females to the genetic landscape of the Mediterranean area was observed with a higher migration rate in females than in males. A certain level of background linkage disequilibrium in populations in Ibiza and Cosenza could be attributed to their demographic background.
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Affiliation(s)
- Carmen Tomas
- Section of Forensic Genetics, Department of Forensic Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
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The ins and outs of population relationships in west-Mediterranean islands: data from autosomal Alu polymorphisms and Alu/STR compound systems. J Hum Genet 2007; 52:999-1010. [DOI: 10.1007/s10038-007-0206-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2007] [Accepted: 09/28/2007] [Indexed: 10/22/2022]
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