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Moreno-Mayar JV, Korneliussen TS, Dalal J, Renaud G, Albrechtsen A, Nielsen R, Malaspinas AS. A likelihood method for estimating present-day human contamination in ancient male samples using low-depth X-chromosome data. Bioinformatics 2019; 36:828-841. [PMID: 31504166 PMCID: PMC8215924 DOI: 10.1093/bioinformatics/btz660] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 08/05/2019] [Accepted: 08/22/2019] [Indexed: 01/31/2023] Open
Abstract
MOTIVATION The presence of present-day human contaminating DNA fragments is one of the challenges defining ancient DNA (aDNA) research. This is especially relevant to the ancient human DNA field where it is difficult to distinguish endogenous molecules from human contaminants due to their genetic similarity. Recently, with the advent of high-throughput sequencing and new aDNA protocols, hundreds of ancient human genomes have become available. Contamination in those genomes has been measured with computational methods often developed specifically for these empirical studies. Consequently, some of these methods have not been implemented and tested for general use while few are aimed at low-depth nuclear data, a common feature in aDNA datasets. RESULTS We develop a new X-chromosome-based maximum likelihood method for estimating present-day human contamination in low-depth sequencing data from male individuals. We implement our method for general use, assess its performance under conditions typical of ancient human DNA research, and compare it to previous nuclear data-based methods through extensive simulations. For low-depth data, we show that existing methods can produce unusable estimates or substantially underestimate contamination. In contrast, our method provides accurate estimates for a depth of coverage as low as 0.5× on the X-chromosome when contamination is below 25%. Moreover, our method still yields meaningful estimates in very challenging situations, i.e. when the contaminant and the target come from closely related populations or with increased error rates. With a running time below 5 min, our method is applicable to large scale aDNA genomic studies. AVAILABILITY AND IMPLEMENTATION The method is implemented in C++ and R and is available in github.com/sapfo/contaminationX and popgen.dk/angsd.
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Affiliation(s)
| | | | - Jyoti Dalal
- Department of Computational Biology, University of Lausanne, 1015 Lausanne, Switzerland,Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Gabriel Renaud
- Lundbeck Foundation GeoGenetics Centre, GLOBE Institute, University of Copenhagen, 1350 Copenhagen
| | - Anders Albrechtsen
- Department of Biology, The Bioinformatics Centre, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Rasmus Nielsen
- Lundbeck Foundation GeoGenetics Centre, GLOBE Institute, University of Copenhagen, 1350 Copenhagen,Department of Statistics, CA 94720, USA,Department of Integrative Biology, University of California, Berkeley, CA 94720, USA
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Vanek D, Budowle B, Dubska-Votrubova J, Ambers A, Frolik J, Pospisek M, Al Afeefi AA, Al Hosani KI, Allen M, Al Naimi KS, Al Salafi D, Al Tayyari WAR, Arguetaa W, Bottinelli M, Bus MM, Cemper-Kiesslich J, Cepil O, De Cock G, Desmyter S, El Amri H, El Ossmani H, Galdies R, Grün S, Guidet F, Hoefges A, Iancu CB, Lotz P, Maresca A, Nagy M, Novotny J, Rachid H, Rothe J, Stenersen M, Stephenson M, Stevanovitch A, Strien J, Sumita DR, Vella J, Zander J. Results of a collaborative study on DNA identification of aged bone samples. Croat Med J 2017; 58:203-213. [PMID: 28613037 PMCID: PMC5470125 DOI: 10.3325/cmj.2017.58.203] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 05/31/2017] [Indexed: 11/10/2022] Open
Abstract
AIM A collaborative exercise with several institutes was organized by the Forensic DNA Service (FDNAS) and the Institute of the Legal Medicine, 2nd Faculty of Medicine, Charles University in Prague, Czech Republic, with the aim to test performance of different laboratories carrying out DNA analysis of relatively old bone samples. METHODS Eighteen laboratories participating in the collaborative exercise were asked to perform DNA typing of two samples of bone powder. Two bone samples provided by the National Museum and the Institute of Archaelogy in Prague, Czech Republic, came from archeological excavations and were estimated to be approximately 150 and 400 years old. The methods of genetic characterization including autosomal, gonosomal, and mitochondrial markers was selected solely at the discretion of the participating laboratory. RESULTS Although the participating laboratories used different extraction and amplification strategies, concordant results were obtained from the relatively intact 150 years old bone sample. Typing was more problematic with the analysis of the 400 years old bone sample due to poorer quality. CONCLUSION The laboratories performing identification DNA analysis of bone and teeth samples should regularly test their ability to correctly perform DNA-based identification on bone samples containing degraded DNA and potential inhibitors and demonstrate that risk of contamination is minimized.
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Affiliation(s)
- Daniel Vanek
- Daniel Vanek, Forensic DNA Service, Budinova 2, 180 81 Prague 8, Czech Republic,
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Jones J, Mirzaei M, Ravishankar P, Xavier D, Lim DS, Shin DH, Bianucci R, Haynes PA. Identification of proteins from 4200-year-old skin and muscle tissue biopsies from ancient Egyptian mummies of the first intermediate period shows evidence of acute inflammation and severe immune response. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2016; 374:rsta.2015.0373. [PMID: 27644972 PMCID: PMC5031639 DOI: 10.1098/rsta.2015.0373] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/28/2016] [Indexed: 05/18/2023]
Abstract
We performed proteomics analysis on four skin and one muscle tissue samples taken from three ancient Egyptian mummies of the first intermediate period, approximately 4200 years old. The mummies were first dated by radiocarbon dating of the accompany-\break ing textiles, and morphologically examined by scanning electron microscopy of additional skin samples. Proteins were extracted, separated on SDS-PAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) gels, and in-gel digested with trypsin. The resulting peptides were analysed using nanoflow high-performance liquid chromatography-mass spectrometry. We identified a total of 230 unique proteins from the five samples, which consisted of 132 unique protein identifications. We found a large number of collagens, which was confirmed by our microscopy data, and is in agreement with previous studies showing that collagens are very long-lived. As expected, we also found a large number of keratins. We identified numerous proteins that provide evidence of activation of the innate immunity system in two of the mummies, one of which also contained proteins indicating severe tissue inflammation, possibly indicative of an infection that we can speculate may have been related to the cause of death.This article is part of the themed issue 'Quantitative mass spectrometry'.
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Affiliation(s)
- Jana Jones
- Department of Ancient History, Macquarie University, North Ryde, NSW 2109, Australia
| | - Mehdi Mirzaei
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia
| | - Prathiba Ravishankar
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia
| | - Dylan Xavier
- Australian Proteome Analysis Facility, Macquarie University, North Ryde, NSW 2109, Australia
| | - Do Seon Lim
- Department of Dental Hygiene, College of Health Sciences, Eulji University, Sungnam, South Korea
| | - Dong Hoon Shin
- Department of Anatomy, Seoul National University, College of Medicine, Seoul, South Korea
| | - Raffaella Bianucci
- Department of Public Health and Paediatric Sciences, Legal Medicine Section, University of Turin, 10126 Turin, Italy UMR 7268, Laboratoire d'Anthropologie bio-culturelle, Droit, Étique and Santé (ADÉS), Faculté de Médecine de Marseille, 13344 Marseille, France
| | - Paul A Haynes
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia
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Ozdemir-Kaynak E, Yesil-Celiktas O. Microwave-assisted digestion combined with silica-based spin column for DNA isolation from human bones. Anal Biochem 2015; 486:44-50. [PMID: 26142220 DOI: 10.1016/j.ab.2015.06.034] [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] [Received: 05/21/2015] [Revised: 06/25/2015] [Accepted: 06/28/2015] [Indexed: 12/25/2022]
Abstract
A protocol for the extraction of DNA from ancient skeletal material was developed. Bone specimen samples (powder or slice), buffer, pretreatment, and extraction methodologies were compared to investigate the best conditions yielding the highest concentration of DNA. The degree of extract contamination by polymerase chain reaction (PCR) inhibitors was compared as well. Pretreatment was carried out using agitation in an incubator shaker and microwave digestion. Subsequently, DNA from bones was isolated by the classical organic phenol-chloroform extraction and silica-based spin columns. Decalcification buffer for total demineralization was required as well as lysis buffer for cell lysis to obtain DNA, whereas microwave-assisted digestion proved to be very rapid, with an incubation time of 2min instead of 24h at an incubator shaker without using lysis buffer. The correction of isolated DNA was detected using real-time PCR with melt curve analysis, which was 82.8±0.2°C for highly repetitive α-satellite gene region specific for human chromosome 17 (locus D17Z1). Consequently, microwave-based DNA digestion followed by silica column yielded a high-purity DNA with a concentration of 19.40ng/μl and proved to be a superior alternative to the phenol-chloroform method, presenting an environmentally friendly and efficient technique for DNA extraction.
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Affiliation(s)
- Elif Ozdemir-Kaynak
- Department of Bioengineering, Faculty of Engineering, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey; Novel Fluidic Technologies and Applications Group, Department of Bioengineering, Faculty of Engineering, Ege University, 35100 Bornova-Izmir, Turkey
| | - Ozlem Yesil-Celiktas
- Novel Fluidic Technologies and Applications Group, Department of Bioengineering, Faculty of Engineering, Ege University, 35100 Bornova-Izmir, Turkey.
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Brandt G, Szécsényi-Nagy A, Roth C, Alt KW, Haak W. Human paleogenetics of Europe--the known knowns and the known unknowns. J Hum Evol 2014; 79:73-92. [PMID: 25467114 DOI: 10.1016/j.jhevol.2014.06.017] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 03/25/2014] [Accepted: 06/19/2014] [Indexed: 12/01/2022]
Abstract
The number of ancient human DNA studies has drastically increased in recent years. This results in a substantial record of mitochondrial sequences available from many prehistoric sites across Western Eurasia, but also growing Y-chromosome and autosomal sequence data. We review the current state of research with specific emphasis on the Holocene population events that likely have shaped the present-day genetic variation in Europe. We reconcile observations from the genetic data with hypotheses about the peopling and settlement history from anthropology and archaeology for various key regions, and also discuss the data in light of evidence from related disciplines, such as modern human genetics, climatology and linguistics.
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Affiliation(s)
- Guido Brandt
- Institute of Anthropology, Johannes Gutenberg University Mainz, Colonel-Kleinmannweg 2, D-55099 Mainz, Germany
| | - Anna Szécsényi-Nagy
- Institute of Anthropology, Johannes Gutenberg University Mainz, Colonel-Kleinmannweg 2, D-55099 Mainz, Germany; Archaeological Institute, Research Centre for the Humanities, Hungarian Academy of Sciences, H-1014 Budapest, Hungary
| | - Christina Roth
- Institute of Anthropology, Johannes Gutenberg University Mainz, Colonel-Kleinmannweg 2, D-55099 Mainz, Germany
| | - Kurt Werner Alt
- State Office for Heritage Management and Archaeology Saxony-Anhalt and State Heritage Museum, Richard-Wagner-Straße 9, D-06114 Halle, Germany; Institute for Prehistory and Archaeological Science, Basel University, Petersplatz 1, 4003 Basel, Switzerland; Danube Private University, Faculty of Medicine and Dentistry, Doktor-Karl-Dorrek-Straße 23, 3500 Krems an der Donau, Austria
| | - Wolfgang Haak
- Australian Centre for Ancient DNA, The University of Adelaide, North Terrace Campus, SA-5005 Adelaide, Australia.
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Forensic strategy to ensure the quality of sequencing data of mitochondrial DNA in highly degraded samples. Leg Med (Tokyo) 2014; 16:52-5. [DOI: 10.1016/j.legalmed.2013.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 09/18/2013] [Accepted: 10/04/2013] [Indexed: 11/23/2022]
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Higgins D, Austin JJ. Teeth as a source of DNA for forensic identification of human remains: a review. Sci Justice 2013; 53:433-41. [PMID: 24188345 DOI: 10.1016/j.scijus.2013.06.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 05/30/2013] [Accepted: 06/12/2013] [Indexed: 01/08/2023]
Abstract
Teeth and bones are frequently the only sources of DNA available for identification of degraded or fragmented human remains. The unique composition of teeth and their location in the jawbone provide additional protection to DNA compared to bones making them a preferred source of DNA in many cases. Despite this, post-mortem changes in the structure and composition of teeth, and the location and diagenesis of DNA within them are poorly understood. This review summarises current knowledge of tooth morphology with respect to DNA content and preservation, and discusses the way in which post-mortem changes will affect the recovery of DNA from teeth under a range of commonly used extraction protocols. We highlight the benefits and pitfalls of using specific tooth tissues for DNA extraction and make recommendations for tooth selection and sampling that will maximise DNA typing success. A comprehensive understanding of tooth structure and an appreciation of the relationship between DNA and mineralized tissues in post-mortem teeth are critical for optimal sample selection. More informed sampling methods that target specific tooth tissues will increase the likelihood of successful genetic analysis and allow for efficient and timely missing persons case work and disaster victim identification response.
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Affiliation(s)
- Denice Higgins
- Australian Centre for Ancient DNA, School of Earth and Environmental Sciences and Environment Institute, University of Adelaide, South Australia 5005, Australia.
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