A new scientific study conducted in South Africa challenges the widespread assumption that hot climates completely destroy ancient DNA. Researchers recovered 50,000-year-old DNA from an antelope fossil, redefining the limits of genetic preservation in warm regions and shedding light on Africa’s evolutionary past. Published in the journal Quaternary Science Reviews, the discovery opens a new chapter in efforts to reconstruct the genetic history of animals and early humans in the region.
Genes That Defy a Hot Climate
Under normal circumstances, high temperatures accelerate DNA degradation, so most ancient DNA studies to date have focused on remains from cold environments. This has left the genetic past of Africa, the cradle of humankind and many mammal species, largely in the dark. By analyzing 144 fossil samples collected in South Africa, however, researchers have now overturned this assumption. Their analyses detected authentic ancient DNA in 45 percent of the specimens and collagen, the primary structural protein in bone, in 35 percent.
Rebuilding Evolutionary Connections
Although most of the analyzed specimens belong to animals younger than 11,700 years, the team also identified original ancient DNA in four older fossils dated to the Late Pleistocene. Even though the amount of genetic material recovered from these remains is limited, it was sufficient for scientists to infer evolutionary relationships between species. With a larger sample set, the researchers aim to map how animal populations across Africa moved, intermixed, and changed during the last glacial period.
A New Link in the Ancient DNA Revolution
In recent years, technological advances in archaeology have triggered something of a revolution in the recovery of genetic data from organic remains [2]. Scientists are now able to trace the past not only from bones and teeth but also from sediments and even proteins preserved in fossilized eggshells dating back millions of years [1]. From Russia’s frozen tundra to Africa’s hot savannas, such genetic research is allowing us to study the evolution of life on Earth directly [3]. The latest findings from South Africa indicate that archaeological sites in warm regions may also serve as vast genetic archives for the history of both humanity and the natural world.
Sources and further reading
- [1] Ancient eggshell protein breaks through DNA time barrier | Geology Page
- [2] Archaeologists in ‘ancient DNA revolution’ as technology breakthrough 'rewrites history' | World | News | Express.co.uk
- [3] In Russia, an Ancient DNA Researcher Rewrites the Past - Archaeology
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