TY  - JOUR
A1  - Chang, Dan
A1  - Knapp, Michael
A1  - Enk, Jacob
A1  - Lippold, Sebastian
A1  - Kircher, Martin
A1  - Lister, Adrian M.
A1  - MacPhee, Ross D. E.
A1  - Widga, Christopher
A1  - Czechowski, Paul
A1  - Sommer, Robert
A1  - Hodges, Emily
A1  - Stümpel, Nikolaus
A1  - Barnes, Ian
A1  - Dalén, Love
A1  - Derevianko, Anatoly
A1  - Germonpré, Mietje
A1  - Hillebrand-Voiculescu, Alexandra
A1  - Constantin, Silviu
A1  - Kuznetsova, Tatyana
A1  - Mol, Dick
A1  - Rathgeber, Thomas
A1  - Rosendahl, Wilfried
A1  - Tikhonov, Alexey N.
A1  - Willerslev, Eske
A1  - Hannon, Greg
A1  - Lalueza i Fox, Carles
A1  - Joger, Ulrich
A1  - Poinar, Hendrik N.
A1  - Hofreiter, Michael
A1  - Shapiro, Beth
T1  - The evolutionary and phylogeographic history of woolly mammoths
BT  - a comprehensive mitogenomic analysis
JF  - Scientific reports
N2  - Near the end of the Pleistocene epoch, populations of the woolly mammoth (Mammuthus primigenius) were distributed across parts of three continents, from western Europe and northern Asia through Beringia to the Atlantic seaboard of North America. Nonetheless, questions about the connectivity and temporal continuity of mammoth populations and species remain unanswered. We use a combination of targeted enrichment and high-throughput sequencing to assemble and interpret a data set of 143 mammoth mitochondrial genomes, sampled from fossils recovered from across their Holarctic range. Our dataset includes 54 previously unpublished mitochondrial genomes and significantly increases the coverage of the Eurasian range of the species. The resulting global phylogeny confirms that the Late Pleistocene mammoth population comprised three distinct mitochondrial lineages that began to diverge ~1.0–2.0 million years ago (Ma). We also find that mammoth mitochondrial lineages were strongly geographically partitioned throughout the Pleistocene. In combination, our genetic results and the pattern of morphological variation in time and space suggest that male-mediated gene flow, rather than large-scale dispersals, was important in the Pleistocene evolutionary history of mammoths.
Y1  - 2017
U6  - https://doi.org/10.1038/srep44585
SN  - 2045-2322
VL  - 7
PB  - Nature Publishing Group
CY  - London
ER  - 
TY  - JOUR
A1  - Alberti, Federica
A1  - Gonzalez, Javier
A1  - Paijmans, Johanna L. A.
A1  - Basler, Nikolas
A1  - Preick, Michaela
A1  - Henneberger, Kirstin
A1  - Trinks, Alexandra
A1  - Rabeder, Gernot
A1  - Conard, Nicholas J.
A1  - Muenzel, Susanne C.
A1  - Joger, Ulrich
A1  - Fritsch, Guido
A1  - Hildebrandt, Thomas
A1  - Hofreiter, Michael
A1  - Barlow, Axel
T1  - Optimized DNA sampling of ancient bones using Computed Tomography scans
JF  - Molecular ecology resources
N2  - The prevalence of contaminant microbial DNA in ancient bone samples represents the principal limiting factor for palaeogenomic studies, as it may comprise more than 99% of DNA molecules obtained. Efforts to exclude or reduce this contaminant fraction have been numerous but also variable in their success. Here, we present a simple but highly effective method to increase the relative proportion of endogenous molecules obtained from ancient bones. Using computed tomography (CT) scanning, we identify the densest region of a bone as optimal for sampling. This approach accurately identifies the densest internal regions of petrous bones, which are known to be a source of high-purity ancient DNA. For ancient long bones, CT scans reveal a high-density outermost layer, which has been routinely removed and discarded prior to DNA extraction. For almost all long bones investigated, we find that targeted sampling of this outermost layer provides an increase in endogenous DNA content over that obtained from softer, trabecular bone. This targeted sampling can produce as much as 50-fold increase in the proportion of endogenous DNA, providing a directly proportional reduction in sequencing costs for shotgun sequencing experiments. The observed increases in endogenous DNA proportion are not associated with any reduction in absolute endogenous molecule recovery. Although sampling the outermost layer can result in higher levels of human contamination, some bones were found to have more contamination associated with the internal bone structures. Our method is highly consistent, reproducible and applicable across a wide range of bone types, ages and species. We predict that this discovery will greatly extend the potential to study ancient populations and species in the genomics era.
KW  - ancient DNA
KW  - computer tomography
KW  - palaeogenomics
KW  - paleogenetics
KW  - petrous bone
Y1  - 2018
U6  - https://doi.org/10.1111/1755-0998.12911
SN  - 1755-098X
SN  - 1755-0998
VL  - 18
IS  - 6
SP  - 1196
EP  - 1208
PB  - Wiley
CY  - Hoboken
ER  -