نتایج جستجو برای: ancient dna

تعداد نتایج: 542037  

2015
Selina Brace Samuel T. Turvey Marcelo Weksler Menno L. P. Hoogland Ian Barnes

Identifying general patterns of colonization and radiation in island faunas is often hindered by past human-caused extinctions. The insular Caribbean is one of the only complex oceanic-type island systems colonized by land mammals, but has witnessed the globally highest level of mammalian extinction during the Holocene. Using ancient DNA analysis, we reconstruct the evolutionary history of one ...

2016
Peter Z. Revesz

The recent recovery of ancient DNA from a growing number of human samples shows that mitochondrial DNA haplogroup I was introduced to Europe after the end of the Last Glacial Maximum. This paper provides a spatio-temporal analysis of the various subhaplogroups of mitochondrial DNA I. The study suggests that haplogroup I diversified into haplogroups I1, I2’3, I4 and I5 at specific regions in Eur...

Journal: :Trends in microbiology 2005
Martin B Hebsgaard Matthew J Phillips Eske Willerslev

Studies continue to report ancient DNA sequences and viable microbial cells that are many millions of years old. In this paper we evaluate some of the most extravagant claims of geologically ancient DNA. We conclude that although exciting, the reports suffer from inadequate experimental setup and insufficient authentication of results. Consequently, it remains doubtful whether amplifiable DNA s...

2017
Michela Leonardi Pablo Librado Clio Der Sarkissian Mikkel Schubert Ahmed H. Alfarhan Saleh A. Alquraishi Khaled A. S. Al-Rasheid Cristina Gamba Eske Willerslev Ludovic Orlando

Ever since its emergence in 1984, the field of ancient DNA has struggled to overcome the challenges related to the decay of DNA molecules in the fossil record. With the recent development of high-throughput DNA sequencing technologies and molecular techniques tailored to ultra-damaged templates, it has now come of age, merging together approaches in phylogenomics, population genomics, epigenomi...

Research on ancient DNA (aDNA) has the potential to enable molecular biologists and archeologists to decipher certain aspects of history by direct looking into the past. However, several major problems in this field limit the applicability of aDNA studies, most importantly contamination with modern DNA and postmortem DNA degradation. In this study we extracted and analyzed aDNA obtained from ~3...

Journal: :Proceedings. Biological sciences 2014
Jessica L Metcalf Stefan Prost David Nogués-Bravo Eric G DeChaine Christian Anderson Persaram Batra Miguel B Araújo Alan Cooper Robert P Guralnick

One of the grand goals of historical biogeography is to understand how and why species' population sizes and distributions change over time. Multiple types of data drawn from disparate fields, combined into a single modelling framework, are necessary to document changes in a species's demography and distribution, and to determine the drivers responsible for change. Yet truly integrated approach...

Journal: :Theoretical population biology 2016
Nicolas Duforet-Frebourg Montgomery Slatkin

With the great advances in ancient DNA extraction, genetic data are now obtained from geographically separated individuals from both present and past. However, population genetics theory about the joint effect of space and time has not been thoroughly studied. Based on the classical stepping-stone model, we develop the theory of Isolation by distance and time. We derive the correlation of allel...

2015
Robin G. Allaby Rafal Gutaker Andrew C. Clarke Neil Pearson Roselyn Ware Sarah A. Palmer James L. Kitchen Oliver Smith

Our understanding of the evolution of domestication has changed radically in the past 10 years, from a relatively simplistic rapid origin scenario to a protracted complex process in which plants adapted to the human environment. The adaptation of plants continued as the human environment changed with the expansion of agriculture from its centres of origin. Using archaeogenomics and computationa...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2015
Maja Krzewińska Gro Bjørnstad Pontus Skoglund Pall Isolfur Olason Jan Bill Anders Götherström Erika Hagelberg

The medieval Norsemen or Vikings had an important biological and cultural impact on many parts of Europe through raids, colonization and trade, from about AD 793 to 1066. To help understand the genetic affinities of the ancient Norsemen, and their genetic contribution to the gene pool of other Europeans, we analysed DNA markers in Late Iron Age skeletal remains from Norway. DNA was extracted fr...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2015
M Parks S Subramanian C Baroni M C Salvatore G Zhang C D Millar D M Lambert

Recently, the study of ancient DNA (aDNA) has been greatly enhanced by the development of second-generation DNA sequencing technologies and targeted enrichment strategies. These developments have allowed the recovery of several complete ancient genomes, a result that would have been considered virtually impossible only a decade ago. Prior to these developments, aDNA research was largely focused...

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