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Defining Y-SNP variation among the Flemish population (Western Europe) by full genome sequencing. Forensic Sci Int Genet 2017; 31:e12-e16. [PMID: 29089250 DOI: 10.1016/j.fsigen.2017.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 10/10/2017] [Accepted: 10/24/2017] [Indexed: 12/27/2022]
Abstract
Y-chromosomal single nucleotide polymorphisms (Y-SNPs) represent a powerful tool in forensic research and casework, especially for inferring paternal ancestry of unknown perpetrators and unidentified bodies. However, the wealth of recently discovered Y-SNPs, the 'jungle' of different evolutionary lineage trees and nomenclatures, and the lack of population-wide data of many phylogenetically mapped Y-SNPs, limits the use of Y-SNPs in routine forensic approaches. Recently, a concise reference phylogeny of the human Y chromosome, the 'Minimal Reference Y-tree', was introduced aiming to provide a stable phylogeny with optimal global discrimination capacity by including the most resolving Y-SNPs. Here, we obtained a representative sample of 270 whole-genome sequences (WGS) to grasp the Y-SNP variation within the autochthonous Flemish population (Belgium, Western Europe) according to this reference Y-tree. The high quality of the Y-SNP calling was guaranteed for the WGS sample as well as its representativeness for the Flemish population based on the comparison of the main haplogroup frequencies with those from earlier studies on Flanders and the Netherlands. The 270 Flemish Y chromosomes were assigned to 98 different sub-haplogroups of the Minimal Reference Y-tree, showing its high potential of discrimination and confirming the spectrum of evolutionary lineages within Western Europe in general and within Flanders in particular. The full database with all Y-SNP calls of the Flemish sample is public available for future updates including forensic and population genetic studies. New initiatives to categorise Y-SNP variation in other populations according to the reference phylogeny of the Y chromosome are highly encouraged for forensic applications. Recommendations to realise such future population sample sets are discussed based on this study.
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The Y chromosome as the most popular marker in genetic genealogy benefits interdisciplinary research. Hum Genet 2016; 136:559-573. [DOI: 10.1007/s00439-016-1740-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/16/2016] [Indexed: 01/01/2023]
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The Paternal Landscape along the Bight of Benin - Testing Regional Representativeness of West-African Population Samples Using Y-Chromosomal Markers. PLoS One 2015; 10:e0141510. [PMID: 26544036 PMCID: PMC4636292 DOI: 10.1371/journal.pone.0141510] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 10/08/2015] [Indexed: 11/19/2022] Open
Abstract
Patterns of genetic variation in human populations across the African continent are still not well studied in comparison with Eurasia and America, despite the high genetic and cultural diversity among African populations. In population and forensic genetic studies a single sample is often used to represent a complete African region. In such a scenario, inappropriate sampling strategies and/or the use of local, isolated populations may bias interpretations and pose questions of representativeness at a macrogeographic-scale. The non-recombining region of the Y-chromosome (NRY) has great potential to reveal the regional representation of a sample due to its powerful phylogeographic information content. An area poorly characterized for Y-chromosomal data is the West-African region along the Bight of Benin, despite its important history in the trans-Atlantic slave trade and its large number of ethnic groups, languages and lifestyles. In this study, Y-chromosomal haplotypes from four Beninese populations were determined and a global meta-analysis with available Y-SNP and Y-STR data from populations along the Bight of Benin and surrounding areas was performed. A thorough methodology was developed allowing comparison of population samples using Y-chromosomal lineage data based on different Y-SNP panels and phylogenies. Geographic proximity turned out to be the best predictor of genetic affinity between populations along the Bight of Benin. Nevertheless, based on Y-chromosomal data from the literature two population samples differed strongly from others from the same or neighbouring areas and are not regionally representative within large-scale studies. Furthermore, the analysis of the HapMap sample YRI of a Yoruban population from South-western Nigeria based on Y-SNPs and Y-STR data showed for the first time its regional representativeness, a result which is important for standard population and forensic genetic applications using the YRI sample. Therefore, the uniquely and powerful geographical information carried by the Y-chromosome makes it an important locus to test the representativeness of a certain sample even in the genomic era, especially in poorly investigated areas like Africa.
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Johansson MM, Van Geystelen A, Larmuseau MHD, Djurovic S, Andreassen OA, Agartz I, Jazin E. Microarray Analysis of Copy Number Variants on the Human Y Chromosome Reveals Novel and Frequent Duplications Overrepresented in Specific Haplogroups. PLoS One 2015; 10:e0137223. [PMID: 26322892 PMCID: PMC4554990 DOI: 10.1371/journal.pone.0137223] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 08/13/2015] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The human Y chromosome is almost always excluded from genome-wide investigations of copy number variants (CNVs) due to its highly repetitive structure. This chromosome should not be forgotten, not only for its well-known relevance in male fertility, but also for its involvement in clinical phenotypes such as cancers, heart failure and sex specific effects on brain and behaviour. RESULTS We analysed Y chromosome data from Affymetrix 6.0 SNP arrays and found that the signal intensities for most of 8179 SNP/CN probes in the male specific region (MSY) discriminated between a male, background signals in a female and an isodicentric male containing a large deletion of the q-arm and a duplication of the p-arm of the Y chromosome. Therefore, this SNP/CN platform is suitable for identification of gain and loss of Y chromosome sequences. In a set of 1718 males, we found 25 different CNV patterns, many of which are novel. We confirmed some of these variants by PCR or qPCR. The total frequency of individuals with CNVs was 14.7%, including 9.5% with duplications, 4.5% with deletions and 0.7% exhibiting both. Hence, a novel observation is that the frequency of duplications was more than twice the frequency of deletions. Another striking result was that 10 of the 25 detected variants were significantly overrepresented in one or more haplogroups, demonstrating the importance to control for haplogroups in genome-wide investigations to avoid stratification. NO-M214(xM175) individuals presented the highest percentage (95%) of CNVs. If they were not counted, 12.4% of the rest included CNVs, and the difference between duplications (8.9%) and deletions (2.8%) was even larger. CONCLUSIONS Our results demonstrate that currently available genome-wide SNP platforms can be used to identify duplications and deletions in the human Y chromosome. Future association studies of the full spectrum of Y chromosome variants will demonstrate the potential involvement of gain or loss of Y chromosome sequence in different human phenotypes.
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Affiliation(s)
- Martin M. Johansson
- Department of Organismal Biology, EBC, Uppsala University, Uppsala, Sweden
- * E-mail: (MMJ); (EJ)
| | - Anneleen Van Geystelen
- Laboratory of Socioecology and Social Evolution, Department of Biology, KU Leuven, Leuven, Belgium
| | - Maarten H. D. Larmuseau
- Laboratory of Socioecology and Social Evolution, Department of Biology, KU Leuven, Leuven, Belgium
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Srdjan Djurovic
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
- NORMENT, KG Jebsen Centre for Psychosis Research, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - Ole A. Andreassen
- NORMENT, KG Jebsen Centre for Psychosis Research, Division of Mental Health and Addiction, Oslo University Hospital & Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Ingrid Agartz
- NORMENT, KG Jebsen Centre for Psychosis Research, Division of Mental Health and Addiction, Oslo University Hospital & Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Psychiatric Research, Diakonhjemmet Hospital, Oslo, Norway
| | - Elena Jazin
- Department of Organismal Biology, EBC, Uppsala University, Uppsala, Sweden
- * E-mail: (MMJ); (EJ)
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Trombetta B, D'Atanasio E, Massaia A, Ippoliti M, Coppa A, Candilio F, Coia V, Russo G, Dugoujon JM, Moral P, Akar N, Sellitto D, Valesini G, Novelletto A, Scozzari R, Cruciani F. Phylogeographic Refinement and Large Scale Genotyping of Human Y Chromosome Haplogroup E Provide New Insights into the Dispersal of Early Pastoralists in the African Continent. Genome Biol Evol 2015; 7:1940-50. [PMID: 26108492 PMCID: PMC4524485 DOI: 10.1093/gbe/evv118] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Haplogroup E, defined by mutation M40, is the most common human Y chromosome clade within Africa. To increase the level of resolution of haplogroup E, we disclosed the phylogenetic relationships among 729 mutations found in 33 haplogroup DE Y-chromosomes sequenced at high coverage in previous studies. Additionally, we dissected the E-M35 subclade by genotyping 62 informative markers in 5,222 samples from 118 worldwide populations. The phylogeny of haplogroup E showed novel features compared with the previous topology, including a new basal dichotomy. Within haplogroup E-M35, we resolved all the previously known polytomies and assigned all the E-M35* chromosomes to five new different clades, all belonging to a newly identified subhaplogroup (E-V1515), which accounts for almost half of the E-M35 chromosomes from the Horn of Africa. Moreover, using a Bayesian phylogeographic analysis and a single nucleotide polymorphism-based approach we localized and dated the origin of this new lineage in the northern part of the Horn, about 12 ka. Time frames, phylogenetic structuring, and sociogeographic distribution of E-V1515 and its subclades are consistent with a multistep demic spread of pastoralism within north-eastern Africa and its subsequent diffusion to subequatorial areas. In addition, our results increase the discriminative power of the E-M35 haplogroup for use in forensic genetics through the identification of new ancestry-informative markers.
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Affiliation(s)
- Beniamino Trombetta
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy
| | - Eugenia D'Atanasio
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy
| | - Andrea Massaia
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy Present address: The Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - Marco Ippoliti
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy
| | - Alfredo Coppa
- Dipartimento di Biologia Ambientale, Sapienza Università di Roma, Italy
| | | | - Valentina Coia
- Accademia Europea di Bolzano (EURAC), Istituto per le Mummie e l'Iceman, Bolzano, Italy
| | - Gianluca Russo
- Dipartimento di Sanità Pubblica e Malattie Infettive, Sapienza Università di Roma, Italy
| | - 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
| | - Pedro Moral
- Department of Animal Biology-Anthropology, Biodiversity Research Institute, University of Barcelona, Spain
| | - Nejat Akar
- Pediatrics Department, TOBB-Economy and Technology University Hospital, Ankara, Turkey
| | | | - Guido Valesini
- Dipartimento di Medicina Interna e Specialità Mediche, Sapienza Università di Roma, Italy
| | - Andrea Novelletto
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy
| | - Rosaria Scozzari
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy
| | - Fulvio Cruciani
- Dipartimento di Biologia e Biotecnologie "C. Darwin," Sapienza Università di Roma, Italy Istituto di Biologia e Patologia Molecolari, CNR, Rome Italy
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