Navigation Links
Ancient genome reveals its secrets
Date:8/30/2012

This release is available in German.

The analyses of an international team of researchers led by Svante Pbo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, show that the genetic variation of Denisovans was extremely low, suggesting that although they were present in large parts of Asia, their population was never large for long periods of time. In addition, a comprehensive list documents the genetic changes that set apart modern humans from their archaic relatives. Some of these changes concern genes that are associated with brain function or nervous system development.

In 2010 Svante Pbo and his colleagues sequenced DNA that they isolated from a finger bone fragment discovered in the Denisova Cave in southern Siberia. They found that it belonged to a young girl of a previously unknown group of archaic humans that they called "Denisovans". Thanks to a novel technique which splits the DNA double helix so that each of its two strands can be used for sequencing, the team was able to sequence every position in the Denisovan genome about 30 times over. The thus generated genome sequence shows a quality similar to genomes that have been determined from present-day humans.

In a new study, which is published in this week's issue of the journal Science, Svante Pbo and his colleagues compare the Denisovan genome with those of the Neandertals and eleven modern humans from around the world. Their findings confirm a previous study according to which modern populations from the islands of southeastern Asia share genes with the Denisovans. In addition, the genomes of people from East Asia, and South America include slightly more genes from Neandertals than those of people in Europe: "The excess archaic material in East Asia is more closely related to Neandertals than to Denisovans, so we estimate that the proportion of Neandertal ancestry in Europe is lower than in eastern Asia", the Leipzig researchers report.

"This is an extinct genome sequence of unprecedented accuracy", says Matthias Meyer, the lead author of the study. "For most of the genome we can even determine the differences between the two sets of chromosomes that the Denisovan girl inherited from her mother and father". From this the researchers can tell that genetic variation of the Denisovans was lower than in present-day humans. This is likely due to that an initially small Denisovan population that grew quickly while spreading over a wide geographic range. "If future research of the Neandertal genome shows that their population size changed over time in similar ways, it may well be that a single population expanding out of Africa gave rise to both the Denisovans and the Neandertals", says Svante Pbo, who led the study.

The researchers furthermore generated a list of about 100,000 recent changes in the human genome that occurred after the split from the Denisovans. Some of these changes affect genes that are associated with brain function and nervous system development. Others possibly affect the skin, the eye and dental morphology. "This research will help determining how it was that modern human populations came to expand dramatically in size as well as cultural complexity while archaic humans eventually dwindled in numbers and became physically extinct", says Svante Pbo.

Earlier this year, the Leipzig researchers had already made the entire Denisovan genome sequence available to the broader public by publishing it online.


'/>"/>

Contact: Matthias Meyer
mmeyer@eva.mpg.de
49-341-355-0509
Max-Planck-Gesellschaft
Source:Eurekalert  

Related biology news :

1. Ancient fossils reveal how the mollusc got its teeth
2. Climate and drought lessons from ancient Egypt
3. Feces fossils yield new insights into ancient diets and thrifty genes
4. New species of ancient rodents hint at what could be worlds oldest grasslands
5. Giving ancient life another chance to evolve
6. Ancient global warming allowed greening of Antarctica
7. Evaluation of microscopy techniques may help scientists to better understand ancient plants
8. Tongue analysis software uses ancient Chinese medicine to warn of disease
9. Like curry? New biological role identified for compound used in ancient medicine
10. Ancient giant turtle fossil revealed
11. Whale population size, dynamics determined based on ancient DNA
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ancient genome reveals its secrets
(Date:6/2/2016)... NEW YORK , June 2, 2016   The ... (Weather), is announcing Watson Ads, an industry-first capability in which ... advertising, by being able to ask questions via voice or ... Marketers have long ... with the consumer, that can be personal, relevant and valuable; ...
(Date:6/1/2016)... , June 1, 2016 ... in Election Administration and Criminal Identification to Boost Global ... a recently released TechSci Research report, " Global Biometrics ... Region, Competition Forecast and Opportunities, 2011 - 2021", the ... billion by 2021, on account of growing security concerns ...
(Date:5/20/2016)... MINNEAPOLIS , May 20, 2016  VoiceIt ... technology partnership with VoicePass. By working ... user experience.  Because VoiceIt and VoicePass take slightly ... two engines increases both security and usability. ... expressed excitement about this new partnership. ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... June 23, 2016 , ... ... and Mold) microbial test has received AOAC Research Institute approval 061601. , “This ... introduced last year,” stated Bob Salter, Vice President of Regulatory and Industrial Affairs. ...
(Date:6/23/2016)... 23, 2016   EpiBiome , a precision microbiome ... in debt financing from Silicon Valley Bank (SVB). The ... to advance its drug development efforts, as well as ... "SVB has been an incredible strategic partner to ... traditional bank would provide," said Dr. Aeron Tynes ...
(Date:6/23/2016)... ... June 23, 2016 , ... In a new case report published ... how a patient who developed lymphedema after being treated for breast cancer benefitted from ... the paradigm for dealing with this debilitating, frequent side effect of cancer treatment. ...
(Date:6/23/2016)... June 23, 2016 ... 2016;12(1):22-8 http://doi.org/10.17925/OHR.2016.12.01.22 Published recently ... peer-reviewed journal from touchONCOLOGY, Andrew D Zelenetz ... of cancer care is placing an increasing burden ... expensive biologic therapies. With the patents on many ...
Breaking Biology Technology: