Media Release, Research Story |
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Resurrected mammoth blood very cool |
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Monday, 3 May 2010 | |
A team of international researchers has brought the primary component of mammoth blood back to life using ancient DNA preserved in bones from Siberian specimens 25,000 to 43,000 years old. Studies of recreated mammoth haemoglobin, published today (Monday 3 May) in Nature Genetics [1], reveal special evolutionary adaptations that allowed the mammoth to cool its extremities down in harsh Arctic conditions to minimise heat loss. "It has been remarkable to bring a complex protein from an extinct species, such as the mammoth, back to life," says Professor Alan Cooper [2], Director of the Australian Centre for Ancient DNA [3] (ACAD) at the University of Adelaide, where the mammoth haemoglobin sequences were determined. "This is true palaeobiology, as we can study and measure how these animals functioned as if they were alive today." Professor Cooper is an Australian Research Council Future Fellow [4] and a member of the University's Environment Institute [5]. "We've managed to uncover physiological attributes of an animal that hasn't existed for thousands of years," says team leader Professor Kevin Campbell [6] of the University of Manitoba [7], Canada. "Our approach opens the way to studying the biomolecular and physiological characteristics of extinct species, even for features that leave no trace in the fossil record." The project began over seven years ago when Professor Campbell contacted Professor Cooper, who was then based at the University of Oxford [8], to suggest resurrecting mammoth haemoglobin. "At the time, I thought 'what a great idea' - but it's never going to work," says Professor Cooper. "Still, bringing an extinct protein back to life is such an important concept, we've got to try it." The team converted the mammoth haemoglobin DNA sequences into RNA, and inserted them into modern-day E. coli bacteria, which then manufactured the authentic mammoth protein. "The resulting haemoglobin molecules are no different than 'going back in time' and taking a blood sample from a real mammoth," says Professor Campbell. The team used modern scientific physiological tests and chemical modelling to characterise the biochemical properties that confer mammoths with physiological cold tolerance. Team member Professor Roy Weber [9] of the University of Aarhus [10], Denmark, who performed the physiological testing on the mammoth proteins, says the findings help show how the mammoth survived the extreme Arctic cold. "Three highly unusual changes in the protein sequence allowed the mammoth's blood to deliver oxygen to cells even at very low temperatures, something that indicates adaptation to the Arctic environment," Professor Weber says. For a more detailed information of the study, go to www.youtube.com/watch?v=YN0Va1F_28A [14] | |
Professor Alan Cooper Website: http://www.adelaide.edu.au/acad/ Director Australian Centre for Ancient DNA University of Adelaide Associate Professor Jeremy Austin Email: jeremy.austin@adelaide.edu.au [15] Deputy Director Australian Centre for Ancient DNA University of Adelaide Business: +61 8 8313 4557 Mobile: +61 0404 198 493 Mr David Ellis Email: david.ellis@adelaide.edu.au [16] Website: https://www.adelaide.edu.au/newsroom/ Deputy Director, Media and Corporate Relations External Relations The University of Adelaide Business: +61 8 8313 5414 Mobile: +61 (0)421 612 762 | [17] |