May 5, 2017 Volume 23, Number 18 |
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Scientists Identified the DNA of Neanderthals and Denisovans in the Soil of Caves | |
DNA of extinct humans found in caves No Bones About It: Scientists Recover Ancient DNA From Cave Dirt No bones needed: ancient DNA in soil can tell if humans were around Photos: Looking for Extinct Humans in Ancient Cave Mud The Other Neanderthal YouTube: Neanderthal and Denisovan Genomes A team of German scientists have identified DNA from Neanderthals and Denisovans in seven different locations across Europe and Asia - not through ancient bones, but from the soil of caves. This technique of identifying the DNA of ancient humans, outlined in an article published in Science on April 27, 2017, marks a significant scientific breakthrough. The research team, headed by Matthias Meyer of the Max Planck Institute for Evolutionary Anthropology, wanted to identify away to study the genes of ancient humans that did not rely on bones, which are scarce in availability. As Meyer explains, "We know that several components of sediments can bind DNA. We therefore decided to investigate whether hominin DNA may survive in sediments at archaeological sites known to have been occupied by ancient hominins." Meyer and his team selected sites in four different caves where early humans are known to have lived between 14,000 and 550,000 years ago. The team then examined small samples of sediment using chemical reagents to extract mitochondrial DNA from 14 different mammals, including Neanderthals and Denisovans. To aide in this arduous process (which is far more time consuming that extracting DNA from fossils), the team built a robotic machine to help examine each sample of sediment. This new technology paves the way for future research about ancient humans, their lifestyle, and their migration patterns. [MMB] The first three links take readers to articles from BBC News, The New York Times and Ars Technica that describe this research and its significance. Next, Live Science offers a photo gallery of caves studied by researchers from the Max Planck Institute. Moving along, readers who are interested in learning more about Denisovans, named after the Siberian cave where their DNA was first identified, will want to check out this 2014 article from The Atlantic. Finally, visitors may be interested in this 2014 lecture from Ed Green about Neanderthal and Denisovan genomes and how they relate to the human genome. [MMB] |