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Newswise Genetic adaptations for life at high elevations found in residents of the Tibetan plateau likely originated around 30,000 years ago in peoples related to contemporary Sherpa. These genes were passed on to more recent migrants from lower elevations via population mixing, and then amplified by natural selection in the modern Tibetan gene pool, according to a new study by scientists from the University of Chicago and Case Western Reserve University, published in Nature Communications on Feb. 10.

The transfer of beneficial mutations between human populations and selective enrichment of these genes in descendent generations represents a novel mechanism for adaptation to new environments.

The Tibetan genome appears to arise from a mixture of two ancestral gene pools, said Anna Di Rienzo, PhD, professor of human genetics at the University of Chicago and corresponding author of the study. One migrated early to high altitude and adapted to this environment. The other, which migrated more recently from low altitudes, acquired the advantageous alleles from the resident high-altitude population by interbreeding and forming what we refer to today as Tibetans.

High elevations are challenging for humans because of low oxygen levels but Tibetans are well adapted to life above 13,000 feet. Due to physiological traits such as relatively low hemoglobin concentrations at altitude, Tibetans have lower risk of complications, such as thrombosis, compared to short-term visitors from low altitude. Unique to Tibetans are variants of the EGLN1 and EPAS1 genes, key genes in the oxygen homeostasis system at all altitudes. These variants were hypothesized to have evolved around 3,000 years ago, a date which conflicts with much older archaeological evidence of human settlement in Tibet.

To shed light on the evolutionary origins of these gene variants, Di Rienzo and her team, led by first author Choongwon Jeong, graduate student at the University of Chicago, obtained genome-wide data from 69 Nepalese Sherpa, an ethnic group related to Tibetans. These were analyzed together with the genomes of 96 unrelated individuals from high-altitude regions of the Tibetan plateau, worldwide genomes from HapMap3 and the Human Genome Diversity Panel, as well as data from Indian, Central Asian and two Siberian populations, through multiple statistical methods and sophisticated software.

The researchers found that, on a genomic level, modern Tibetans appear to descend from populations related to modern Sherpa and Han Chinese. Tibetans carry a roughly even mixture of two ancestral genomes: one a high-altitude component shared with Sherpa and the other a low-altitude component shared with lowlander East Asians. The low-altitude component is found at low to nonexistent frequencies in modern Sherpa, and the high-altitude component is uncommon in lowlanders. This strongly suggested that the ancestor populations of Tibetans interbred and exchanged genes, a process known as genetic admixture.

Tracing the history of these ancestor groups through genome analysis, the team identified a population size split between Sherpa and lowland East Asians around 20,000 to 40,000 years ago, a range consistent with proposed archaeological, mitochondria DNA and Y chromosome evidence for an initial colonization of the Tibetan plateau around 30,000 years ago.

This is a good example of evolution as a tinkerer, said Cynthia Beall, PhD, professor of anthropology at Case Western Reserve University and co-author on the study. We see other examples of admixtures. Outside of Africa, most of us have Neanderthal genesabout 2 to 5 percent of our genomeand people today have some immune system genes from another ancient group called the Denisovans.

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The Genetic Origins of High-Altitude Adaptations in Tibetans