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Qiao Y, Jewett EM, McManus KF, Freyman WA, Curran JE, Williams-Blangero S, Blangero J, Williams AL. Reconstructing parent genomes using siblings and other relatives. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.10.593578. [PMID: 38798596 PMCID: PMC11118276 DOI: 10.1101/2024.05.10.593578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Reconstructing the DNA of ancestors from their descendants has the potential to empower phenotypic analyses (including association and genetic nurture studies), improve pedigree reconstruction, and shed light on the ancestral population and phenotypes of ancestors. We developed HAPI-RECAP, a method that reconstructs the DNA of parents from full siblings and their relatives. This tool leverages HAPI2's output, a new phasing approach that applies to siblings (and optionally one or both parents) and reliably infers parent haplotypes but does not link the ungenotyped parents' DNA across chromosomes or between segments flanking ambiguities. By combining IBD between the reconstructed parents and the relatives, HAPI-RECAP resolves the source parent of these segments. Moreover, the method exploits crossovers the children inherited and sex-specific genetic maps to infer the reconstructed parents' sexes. We validated these methods on research participants from both 23andMe, Inc. and the San Antonio Mexican American Family Studies. Given data for one parent, HAPI2 reconstructs large fractions of the missing parent's DNA, between 77.6% and 99.97% among all families, and 90.3% on average in three- and four-child families. When reconstructing both parents, HAPI-RECAP inferred between 33.2% and 96.6% of the parents' genotypes, averaging 70.6% in four-child families. Reconstructed genotypes have average error rates < 10-3, or comparable to those from direct genotyping. HAPI-RECAP inferred the parent sexes 100% correctly given IBD-linked segments and can also reconstruct parents without any IBD. As datasets grow in size, more families will be implicitly collected; HAPI-RECAP holds promise to enable high quality parent genotype reconstruction.
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Affiliation(s)
- Ying Qiao
- Department of Computational Biology, Cornell University, Ithaca, NY 14853, USA
| | | | | | | | - Joanne E. Curran
- South Texas Diabetes and Obesity Institute and Department of Human Genetics, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX 78520, USA
| | - Sarah Williams-Blangero
- South Texas Diabetes and Obesity Institute and Department of Human Genetics, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX 78520, USA
| | - John Blangero
- South Texas Diabetes and Obesity Institute and Department of Human Genetics, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX 78520, USA
| | | | - Amy L. Williams
- Department of Computational Biology, Cornell University, Ithaca, NY 14853, USA
- 23andMe, Inc., Sunnyvale, CA 94086, USA
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2
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Sandoval-Velasco M, Jagadeesan A, Ramos-Madrigal J, Ávila-Arcos MC, Fortes-Lima CA, Watson J, Johannesdóttir E, Cruz-Dávalos DI, Gopalakrishnan S, Moreno-Mayar JV, Niemann J, Renaud G, Robson Brown KA, Bennett H, Pearson A, Helgason A, Gilbert MTP, Schroeder H. The ancestry and geographical origins of St Helena's liberated Africans. Am J Hum Genet 2023; 110:1590-1599. [PMID: 37683613 PMCID: PMC10502851 DOI: 10.1016/j.ajhg.2023.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 07/31/2023] [Accepted: 08/03/2023] [Indexed: 09/10/2023] Open
Abstract
The island of St Helena played a crucial role in the suppression of the transatlantic slave trade. Strategically located in the middle of the South Atlantic, it served as a staging post for the Royal Navy and reception point for enslaved Africans who had been "liberated" from slave ships intercepted by the British. In total, St Helena received approximately 27,000 liberated Africans between 1840 and 1867. Written sources suggest that the majority of these individuals came from West Central Africa, but their precise origins are unknown. Here, we report the results of ancient DNA analyses that we conducted as part of a wider effort to commemorate St Helena's liberated Africans and to restore knowledge of their lives and experiences. We generated partial genomes (0.1-0.5×) for 20 individuals whose remains had been recovered during archaeological excavations on the island. We compared their genomes with genotype data for over 3,000 present-day individuals from 90 populations across sub-Saharan Africa and conclude that the individuals most likely originated from different source populations within the general area between northern Angola and Gabon. We also find that the majority (17/20) of the individuals were male, supporting a well-documented sex bias in the latter phase of the transatlantic slave trade. The study expands our understanding of St Helena's liberated African community and illustrates how ancient DNA analyses can be used to investigate the origins and identities of individuals whose lives were bound up in the story of slavery and its abolition.
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Affiliation(s)
- Marcela Sandoval-Velasco
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark; Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA.
| | - Anuradha Jagadeesan
- deCODE Genetics/Amgen, 101 Reykjavik, Iceland; Department of Anthropology, University of Iceland, 101 Reykjavik, Iceland
| | - Jazmín Ramos-Madrigal
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark
| | - María C Ávila-Arcos
- International Laboratory for Human Genome Research, National Autonomous University of Mexico, Juriquilla, 76230 Santiago de Querétaro, México
| | - Cesar A Fortes-Lima
- Department of Organismal Biology, Uppsala University, 752 36 Uppsala, Sweden
| | - Judy Watson
- Department of Anthropology and Archaeology, University of Bristol, BS8 1UU Bristol, UK
| | - Erna Johannesdóttir
- Department of Anthropology and Archaeology, University of Bristol, BS8 1UU Bristol, UK
| | - Diana I Cruz-Dávalos
- Department of Computational Biology, University of Lausanne, 1015 Lausanne, Switzerland; Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Shyam Gopalakrishnan
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark
| | - J Víctor Moreno-Mayar
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark
| | - Jonas Niemann
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark
| | - Gabriel Renaud
- Department of Health Technology Bioinformatics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | | | - Helena Bennett
- St Helena National Trust, Broadway House, Mainstreet, Jamestown, St Helena
| | - Andrew Pearson
- Environmental Dimension Partnership, Atlantic Wharf, CF10 4HF Cardiff, UK
| | - Agnar Helgason
- deCODE Genetics/Amgen, 101 Reykjavik, Iceland; Department of Anthropology, University of Iceland, 101 Reykjavik, Iceland
| | - M Thomas P Gilbert
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark; NTNU University Museum, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Hannes Schroeder
- Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen, 1353 Copenhagen, Denmark.
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Wurst C, Maixner F, Castella V, Cipollini G, Hotz G, Zink A. The Lady from Basel's Barfüsserkirche - Molecular confirmation of the Mummy's identity through mitochondrial DNA of living relatives spanning 22 generations. Forensic Sci Int Genet 2021; 56:102604. [PMID: 34656830 DOI: 10.1016/j.fsigen.2021.102604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/04/2021] [Accepted: 10/06/2021] [Indexed: 11/26/2022]
Abstract
The identity of the mummified Lady from the Barfüsser Church in Basel, Switzerland has been unsolved for decades, despite the prominent location of the burial place in front of the choir screen. A recent multidisciplinary research approach came up with a possible candidate, Anna Catharina Bischoff who died in Basel in 1787 with an age of 69 years (1719-1787). To verify the identity of the mummy, genealogists of the Citizen Science Basel discovered three living individuals of the maternal lineage of two different family branches, separated from Anna Catharina Bischoff by up to 22 generations. In this study we compare the ancient mitochondrial DNA of the mummy recovered from a premolar to the mitochondrial DNA of these three candidates. Initially the mitochondrial hypervariable regions I and II of the living individuals were screened using the Sanger sequencing method. This was followed by a mitochondrial capture approach and next generation sequencing to enrich for the whole mitochondrial genome of the mummy and one living person. A full mitochondrial genome has been recovered of both individuals sharing an identical haplotype. The sequence was assigned to the mitochondrial haplogroup U5a1+!16192 including two private mutations 10006G and 16293C. Only by using an interdisciplinary approach combining ancient DNA analysis and genealogy a maternal lineage of a non-noble family spanning 22 generations could be confirmed.
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Affiliation(s)
- Christina Wurst
- Institute for Mummy Studies, Eurac Research, Drususallee/Viale Druso 1, 39100 Bozen, Bolzano, Italy; Palaeogenetics Group, Institute of Organismic and Molecular Evolution (iomE), Johannes Gutenberg-University Mainz, Saarstraße 21, 55122 Mainz, Germany.
| | - Frank Maixner
- Institute for Mummy Studies, Eurac Research, Drususallee/Viale Druso 1, 39100 Bozen, Bolzano, Italy
| | - Vincent Castella
- Forensic Genetics Unit, University Center of Legal Medicine, Lausanne - Geneva, Lausanne University Hospital and University of Lausanne, Ch. de la Vulliette 4, 1000 Lausanne 25, Switzerland
| | - Giovanna Cipollini
- Institute for Mummy Studies, Eurac Research, Drususallee/Viale Druso 1, 39100 Bozen, Bolzano, Italy
| | - Gerhard Hotz
- Natural History Museum Basel, Augustinergasse 2, 4051 Basel, Switzerland; Integrative Prehistory and Archaeological Science, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland
| | - Albert Zink
- Institute for Mummy Studies, Eurac Research, Drususallee/Viale Druso 1, 39100 Bozen, Bolzano, Italy
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4
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Finke K, Kourakos M, Brown G, Dang HT, Tan SJS, Simons YB, Ramdas S, Schäffer AA, Kember RL, Bućan M, Mathieson S. Ancestral haplotype reconstruction in endogamous populations using identity-by-descent. PLoS Comput Biol 2021; 17:e1008638. [PMID: 33635861 PMCID: PMC7946327 DOI: 10.1371/journal.pcbi.1008638] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 03/10/2021] [Accepted: 12/15/2020] [Indexed: 12/24/2022] Open
Abstract
In this work we develop a novel algorithm for reconstructing the genomes of ancestral individuals, given genotype or sequence data from contemporary individuals and an extended pedigree of family relationships. A pedigree with complete genomes for every individual enables the study of allele frequency dynamics and haplotype diversity across generations, including deviations from neutrality such as transmission distortion. When studying heritable diseases, ancestral haplotypes can be used to augment genome-wide association studies and track disease inheritance patterns. The building blocks of our reconstruction algorithm are segments of Identity-By-Descent (IBD) shared between two or more genotyped individuals. The method alternates between identifying a source for each IBD segment and assembling IBD segments placed within each ancestral individual. Unlike previous approaches, our method is able to accommodate complex pedigree structures with hundreds of individuals genotyped at millions of SNPs. We apply our method to an Old Order Amish pedigree from Lancaster, Pennsylvania, whose founders came to North America from Europe during the early 18th century. The pedigree includes 1338 individuals from the past 12 generations, 394 with genotype data. The motivation for reconstruction is to understand the genetic basis of diseases segregating in the family through tracking haplotype transmission over time. Using our algorithm thread, we are able to reconstruct an average of 224 ancestral individuals per chromosome. For these ancestral individuals, on average we reconstruct 79% of their haplotypes. We also identify a region on chromosome 16 that is difficult to reconstruct—we find that this region harbors a short Amish-specific copy number variation and the gene HYDIN. thread was developed for endogamous populations, but can be applied to any extensive pedigree with the recent generations genotyped. We anticipate that this type of practical ancestral reconstruction will become more common and necessary to understand rare and complex heritable diseases in extended families. When analyzing complex heritable traits, genomic data from many generations of an extended family increases the amount of information available for statistical inference. However, typically only genomic data from the recent generations of a pedigree are available, as ancestral individuals are deceased. In this work we present an algorithm, called thread, for reconstructing the genomes of ancestral individuals, given a complex pedigree and genomic data from the recent generations. Previous approaches have not been able to accommodate large datasets (both in terms of sites and individuals), made simplifying assumptions about pedigree structure, or did not tie reconstructed sequences back to specific individuals. We apply thread to a complex Old Order Amish pedigree of 1338 individuals, 394 with genotype data.
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Affiliation(s)
- Kelly Finke
- Department of Computer Science, Swarthmore College, Swarthmore, Pennsylvania, United States of America
- Department of Biology, Swarthmore College, Swarthmore, Pennsylvania, United States of America
| | - Michael Kourakos
- Department of Computer Science, Swarthmore College, Swarthmore, Pennsylvania, United States of America
| | - Gabriela Brown
- Department of Computer Science, Swarthmore College, Swarthmore, Pennsylvania, United States of America
| | - Huyen Trang Dang
- Department of Computer Science, Bryn Mawr College, Bryn Mawr, Pennsylvania, United States of America
| | - Shi Jie Samuel Tan
- Department of Computer Science, Haverford College, Haverford, Pennsylvania, United States of America
| | - Yuval B. Simons
- Department of Genetics, Stanford University, Stanford, California, United States of America
| | - Shweta Ramdas
- Department of Genetics, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Alejandro A. Schäffer
- Cancer Data Science Laboratory, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Rachel L. Kember
- Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Maja Bućan
- Department of Genetics, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Sara Mathieson
- Department of Computer Science, Haverford College, Haverford, Pennsylvania, United States of America
- * E-mail:
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Perego UA, Bodner M, Raveane A, Woodward SR, Montinaro F, Parson W, Achilli A. Resolving a 150-year-old paternity case in Mormon history using DTC autosomal DNA testing of distant relatives. Forensic Sci Int Genet 2019; 42:1-7. [DOI: 10.1016/j.fsigen.2019.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/31/2019] [Accepted: 05/31/2019] [Indexed: 01/01/2023]
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6
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Backenroth D, Carmi S. A test for deviations from expected genotype frequencies on the X chromosome for sex-biased admixed populations. Heredity (Edinb) 2019; 123:470-478. [PMID: 31101879 DOI: 10.1038/s41437-019-0233-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Revised: 04/19/2019] [Accepted: 04/29/2019] [Indexed: 11/09/2022] Open
Abstract
Genome-wide scans for deviations from expected genotype frequencies, as determined by the Hardy-Weinberg equilibrium (HWE), are commonly applied to detect genotyping errors and deviations from random mating. In contrast to the autosomes, genotype frequencies on the X chromosome do not reach HWE within a single generation. Instead, if allele frequencies in males and females initially differ, they oscillate for a few generations toward equilibrium. Allele frequency differences between the sexes are expected in populations that have experienced recent sex-biased admixture, namely, their male and female founders differed in ancestry. Sex-biased admixture does not allow testing for HWE on X, because deviations are naturally expected, even under random mating (post admixture) and error-free genotyping. In this paper, we develop a likelihood ratio test and a χ2 test to detect deviations from expected genotype frequencies on X, beyond natural deviations due to sex-biased admixture. We demonstrate by simulations that our tests are powerful for detecting deviations due to non-random mating, while at the same time they do not reject the null under historical sex-biased admixture and random mating thereafter. We also demonstrate that when applied to 1000 Genomes project populations, our likelihood ratio test rejects fewer SNPs than other tests, but we describe limitations in the interpretation of the results.
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Affiliation(s)
- Daniel Backenroth
- Braun School of Public Health and Community Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Shai Carmi
- Braun School of Public Health and Community Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel.
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The demographic and adaptive history of central African hunter-gatherers and farmers. Curr Opin Genet Dev 2018; 53:90-97. [PMID: 30103089 DOI: 10.1016/j.gde.2018.07.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/18/2018] [Indexed: 01/06/2023]
Abstract
Central Africa, a forested region that supports an exceptionally high biodiversity, hosts the world's largest group of hunter-gatherers, who live in close proximity with groups that have adopted agriculture over the past 5000 years. Our understanding of the prehistory of these populations has been dramatically hampered by the almost total absence of fossil remains in this region, a limitation that has recently been circumvented by population genomics approaches. Different studies have estimated that ancestors of rainforest hunter-gatherers and Bantu-speaking farmers separated more than 60 000 years ago, supporting the occurrence of ancient population structure in Africa since the Late Pleistocene. Conversely, the Holocene in central Africa was characterized by large-scale population migrations associated with the emergence of agriculture, and increased genetic interactions between autochthonous rainforest hunter-gatherers and expanding Bantu-speaking farmers. Genomic scans have detected numerous candidate loci for positive selection in these populations, including convergent adaptation for short stature in groups of rainforest hunter-gatherers and local adaptation to endemic malaria in western and central Africans. Furthermore, there is recent increasing evidence that adaptive variation has been acquired by various African populations through admixture, suggesting a previously unappreciated role of intraspecies gene flow in local adaptation. Ancient and modern DNA studies will greatly broaden, and probably challenge, our view on the past history of central Africa, where introgression from yet uncharacterized archaic hominins and long-term adaptation to distinct ecological niches are suspected.
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Muller AWJ. Aging is an adaptation that selects in animals against disruption of homeostasis. Med Hypotheses 2018; 119:68-78. [PMID: 30122495 DOI: 10.1016/j.mehy.2018.07.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 07/17/2018] [Accepted: 07/25/2018] [Indexed: 01/10/2023]
Abstract
During evolution, Muller's ratchet permanently generates deleterious germline mutations that eventually must be defused by selection. It seems widely held that cancer and aging-related diseases (ARDs) cannot contribute to this germline gene selection because they tail reproduction and thus occur too late, at the end of the life cycle. Here we posit however that by lessening the offspring's survival by proxy through diminishing parental care, they can still contribute to the selection. The hypothesis in detail: The widespread occurrence of aging in animals suggests that it is an adaptation. But to what benefit? Aging seems to have only drawbacks. In humans, ARDs cause today almost all mortality; they include heart disease, cerebrovascular disease, Alzheimer's disease, kidney disease and cancer. Compensation seems unthinkable. For cancer, the author proposed in a previous study a benefit to the species: purifying selection against deleterious germline genes that when expressed enhance intracellular energy dissipation. This multicausal energy dissipation, posited as the universal origin of cancer initiation, relates to cellular heat generation, disrupted metabolism, and inflammation. The organism reproduces during cancer's dormancy, and when approaching its end of life, the onset of cancer is accelerated in proportion to the cancer-initiating signal. Through cancer, the organism, now a parent, implements the self-actuated programmed death of Skulachev's phenoptosis. This "first death" enhances by proxy the offspring's chance of "second death" (or "double death") through diminished parental care. Repetition over generations realizes a purifying selection against genes causing energy dissipation. The removal of the deleterious germline gene mutations permanently generated by Muller's ratchet gives a benefit. We generalize, motivated by the parallels between cancer and aging, the purifying selection posited for cancer to aging. An ARD would be initiated in the organ by multicausal disruption of homeostasis, and be followed by dormancy and senescence until its onset near the end of the life cycle. Just as for cancer, the ARD eventually enhances double death, and the realized permanent selection gives a benefit to the species through the selection against germ line genes that disrupt homeostasis. Given their similarities, cancer and aging are combined in the posited Unified Cancer-Aging Adaptation (UCAA) model, which may be confirmed by next-generation sequencing data. Also because of the emerging important role of cellular senescence, the hypothesis may guide the development of therapies against both cancer and aging.
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Affiliation(s)
- Anthonie W J Muller
- Synthetic Systems Biology - Nuclear Organization Group, Swammerdam Institute for Life Sciences/University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
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Abstract
Genealogical study provides insight into history and life span and heralds crowdsourced genetic research
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Affiliation(s)
- Alexandre A Lussier
- Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, NY 14853, USA
| | - Alon Keinan
- Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, NY 14853, USA.
- Cornell Center for Comparative and Population Genomics, Center for Vertebrate Genomics, and Center for Enervating Neuroimmune Disease, Cornell University, Ithaca, NY 14853, USA
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Abstract
Over the past decade, the DNA ancestry-testing industry—based largely in the United States—has experienced a huge upsurge in popularity, thanks partly to rapidly developing technologies and the falling prices of products. Meanwhile, the notion of “genetic genealogy” has been strongly endorsed by popular television documentary shows in the US, particularly vis-à-vis African-American roots-seekers—for whom these products are offered as a means to discover one’s ancestral “ethnic” origins, thereby “reversing the Middle Passage.” Yet personalized DNA ancestry tests have not had the same reception among people of African descent in other societies that were historically affected by slavery. This paper outlines and contextualizes these divergent responses by examining and comparing the cultural and political meanings that are attached to notions of origin, as well as the way that Blackness has been defined and articulated, in three different settings: the United States, France and Brazil.
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