Injecting molecules from a sea slug that received tail shocks into one that didn’t made the recipient animal behave more cautiously.
A 4,500-year-old genome, extracted from the skeleton of an Ethiopian man, bears the marks of human migration from Europe back into Africa.
October 13, 2015|
WIKIMEDIA, ANDRO96Researchers have successfully extracted and sequenced ancient DNA from the bones of a man who lived in Ethiopia 4,500 years ago. The millennia-old human genome bears evidence of Eurasian heritage—clues to a migration of humans from Europe and the Near East back into Africa about 3,000 years ago. While scientists have sequenced ancient human genomes from the Near East, Asia, and Europe, this so-called Mota genome is the first sequenced from African skeletal remains, which are less hospitable to DNA molecules due to the warm climate. “Africa is going to be a difficult place for having ancient genomes—especially high quality genomes,” Carles LaLueza-Fox, a paleogeneticist at the Institute of Evolutionary Biology in Barcelona, Spain, who was not involved with the study, told Nature.
An international team published the ancient genome last week (October 8) in Science.The researchers compared Mota’s DNA sequence with modern African genomes and ancient Eurasian DNA, finding evidence to suggest that the man’s genetic material most closely aligns with DNA from modern Ethiopian highlanders of the Ari tribe. Mota and modern Ari genomes bear marks of ancestors likely moved from the Near East into Europe about 9,000 years ago.
“By having these high coverage genomes, we can start seeing a lot of information about what happened,” study coauthor Ron Pinhasi from University College Dublin, Ireland, told New Scientist. “It is the right direction but we need more.”
University of Copenhagen ancient DNA researcher Eske Willerslev told Nature that his group has also had some success extracting sequenceable DNA from human remains found in Africa. “Africa is the next step in terms of the population history of humans,” he said. “It is an obvious place to go and look.”