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Gene from extinct species allows Tibetans to live at high altitude

07 July 2014

By Matthew Thomas

Appeared in BioNews 761

Tibetan people inherited a genetic variant from an extinct subspecies of humans that helps them survive on the 'roof of the world'.

Life is hard at high altitudes. On the Tibetan plateau, over 4,000 metres above sea level, there is less oxygen in the air, the climate is cold and vegetation sparse. The body responds to low levels of oxygen by producing extra haemoglobin, the molecule that carries oxygen in red blood cells. However, this thickens the blood, raising blood pressure and increasing the risk of stroke as well as complications during pregnancy.

The gene in question, EPAS1, helps protect against these risks by limiting the number of red blood cells produced. The Tibetan version of EPAS1 is different to that found in other populations. It occurs in 87 percent of Tibetans compared to nine percent of Han Chinese - the largest ethnic group in China.

Professor Rasmus Nielsen from the University of California, Berkley, USA, who co-authored the paper, said the study provided 'very clear evidence that this version of the gene came from Denisovans', an ancient group of humans who lived in Asia around 41,000 years ago.

The researchers sequenced the EPAS1 gene in 40 Tibetan and 40 Han people. The DNA code for the Tibetan EPAS1 looked so different that it seemed unlikely to have evolved during the 3,000 years since the group separated from Han people. After searching through other genomes, the team discovered that this unique copy of EPAS1 probably got into Tibetans through crossbreeding with Denisovans.

Everything we know about Denisovans comes from a tiny part of a finger bone, two teeth and a toe, discovered four years ago in a Siberian cave. Scientists were able to sequence DNA from these bones and piece together a Denisovan genome.

This study, published in Nature, adds weight to the idea that interbreeding with ancient human species, most famously Neanderthals, significantly affected the course of human evolution.

Professor Svante Pääbo, a geneticist at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, who originally sequenced the Denisovan genome, told New Scientist: 'It is very satisfying to see that gene flow from Denisovans [...] is now found to have had important consequences for people living today'.


09 May 2016 - by Dr Özge Özkaya 
A study of ancient DNA obtained from prehistoric human remains has revealed details about modern humans before farming began, going back to their arrival in Europe around 45,000 years ago...
22 February 2016 - by Isobel Steer 
Neanderthal-derived DNA influences our risk of certain diseases, including addiction, blood clots, skin conditions and depression, a recent study has found....
23 February 2015 - by Sophie McLachlan 
Humanity's predisposition to disease has been reduced thanks to hundreds of generations of sexual reproduction, research shows...
08 December 2014 - by Sean Byrne 
A gene variant has been linked to a lower risk of the most common cause of stroke in people under 50...

06 May 2014 - by Matthew Thomas 
Geneticists claim to have developed a way of finding where in the world a person's DNA originated...
03 February 2014 - by Dr Anna Cauldwell 
Genes linked with type 2 diabetes, Crohn's disease and even smoking addiction were acquired through interbreeding with Neanderthals, a study published in Nature suggests...
06 January 2014 - by Dr Charlotte Warren-Gash 
A gene variant increases the risk of type 2 diabetes in Latin American populations, according to a study in Nature...
07 November 2011 - by Ruth Retassie 
Present day humans in Southeast Asia have about one percent of DNA originating from Denisovans, an extinct species from the Homo genus...

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