oldest dna ever found sheds light on humans global trek
Last Updated : GMT 06:49:16
Arab Today, arab today
Arab Today, arab today
Last Updated : GMT 06:49:16
Arab Today, arab today

Oldest DNA ever found sheds light on humans' global trek

Arab Today, arab today

Arab Today, arab today Oldest DNA ever found sheds light on humans' global trek

Oldest DNA
Paris - AFP

 Scientists said Wednesday they had unravelled the oldest DNA ever retrieved from a Homo sapiens bone, a feat that sheds light on modern humans' colonisation of the planet.
A femur found by chance on the banks of a west Siberian river in 2008 is that of a man who died around 45,000 years ago, they said.
Teased out of collagen in the ancient bone, the genome contains traces from Neanderthals -- a cousin species who lived in Eurasia alongside H. sapiens before mysteriously disappearing.
Previous research has found that Neanderthals and H. sapiens interbred, leaving a tiny Neanderthal imprint of just about two percent in humans today, except for Africans.
The discovery has a bearing on the so-called "Out of Africa" scenario: the theory that H. sapiens evolved in East Africa around 200,000 years ago and then ventured out of the continent.
Dating when Neanderthals and H. sapiens interbred would also indicate when H. sapiens embarked on a key phase of this trek -- the push out of Eurasia and into South and later Southeast Asia.
The new study, published in the journal Nature, was headed by Svante Paabo, a renowned geneticist at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, who has pioneered research into Neanderthals.
- Neanderthal interbreeding -
The bone found at the Irtyush River, near the settlement of Ust'-Ishim, carries slightly more Neanderthal DNA than non-Africans today, the team found.
But it takes the form of relatively long strips, whereas Neanderthal DNA in our genome today has been cut up and dispersed in tiny sections as a result of generations of reproduction.
These differences provide a clue for a "molecular calendar", or dating DNA according to mutations over thousands of years.
Using this method, Paabo's team estimate interbreeding between Neanderthals and H. sapiens occurred 7,000 to 13,000 years before the Siberian individual lived -- thus no more than 60,000 years ago.
This provides a rough date for estimating when H. sapiens headed into South Asia, Chris Stringer, a professor at Britain's Natural History Museum, said in a comment on the study.
If today's Australasians have Neanderthal DNA, it is because their forebears crossed through Neanderthal territory and mingled with the locals.
"The ancestors of Australasians, with their similar input of Neanderthal DNA to Eurasians, must have been part of a late, rather than early, dispersal through Neanderthal territory," Stringer said in a press release.
"While it is still possible that modern humans did traverse southern Asia before 60,000 years ago, those groups could not have made a significant contribution to the surviving modern populations outside of Africa, which contain evidence of interbreeding with Neanderthals."
Anthropologists suggest a northern branch of Eurasians crossed to modern-day Alaska more than 15,000 years ago via an "ice bridge" that connected islands in the Bering Strait, thus enabling H. sapiens to colonise the Americas.

 

arabstoday
arabstoday

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

oldest dna ever found sheds light on humans global trek oldest dna ever found sheds light on humans global trek

 



Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

oldest dna ever found sheds light on humans global trek oldest dna ever found sheds light on humans global trek

 



GMT 18:57 2016 Wednesday ,05 October

Hollywood icon Robert De Niro arrives this weekend

GMT 08:49 2017 Friday ,28 April

Press cooperation protocol signed

GMT 04:01 2017 Friday ,24 November

Lebanon's Hezbollah hails 'positive' Hariri moves

GMT 16:39 2017 Wednesday ,06 September

Dolphins-Buccaneers NFL game called off as Hurricane Irma

GMT 12:55 2017 Sunday ,19 February

Day 1 Asian Winter Games medal table

GMT 10:01 2016 Tuesday ,16 August

Bayer could launch hostile bid for Monsanto

GMT 02:09 2017 Wednesday ,18 October

December22nd-January20th

GMT 12:53 2017 Tuesday ,22 August

Mahmoud informed on AAAID performance

GMT 11:45 2017 Thursday ,20 April

Expo Turkey by Qatar begins

GMT 09:59 2017 Tuesday ,25 April

A chaotic discovery of power

GMT 20:52 2017 Thursday ,27 April

Iraqi forces liberate Mutaibaija area from IS
Arab Today, arab today
 
 Arab Today Facebook,arab today facebook  Arab Today Twitter,arab today twitter Arab Today Rss,arab today rss  Arab Today Youtube,arab today youtube  Arab Today Youtube,arab today youtube

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2025 ©

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2025 ©

arabstoday arabstoday arabstoday arabstoday
arabstoday arabstoday arabstoday
arabstoday
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
arabstoday, Arabstoday, Arabstoday