The ancient woolly mammoths and Neanderthals shared similar genetic traits, according to study which may help explain how the two extinct mammals adapted to the cold environments.
Woolly were elephant-like animals that evolved in the arctic peninsula of Eurasia around 600,000 years ago, while Neanderthals were highly skilled early humans who evolved in Europe around 400,000 years ago.
The research attributes the human-elephant relationship during the Pleistocene epoch to their mutual ecology and shared living environments, in addition to other possible interactions between the two species.
"Neanderthals and mammoths lived together in Europe during the Ice Age. The evidence suggests that Neanderthals hunted and ate mammoths for tens of thousands of years and were actually physically dependent on calories extracted from mammoths for their successful adaptation," said Ran Barkai, from Tel Aviv University in the US.
"Neanderthals depended on mammoths for their very existence," Barkai said in statement.
"They say you are what you eat. This was especially true of Neanderthals; they ate mammoths but were apparently also genetically similar to mammoths," he said.
To assess the degree of resemblance between mammoth and Neanderthal genetic components, the archaeologists reviewed three case studies of relevant gene variants and alleles -- alternative forms of a gene that arise by mutation and are found at the same place on a chromosome -- associated with cold-climate adaptation found in the genomes of both woolly mammoths and Neanderthals.
The first outlined the mutual appearance of the LEPR gene, related to thermogenesis and the regulation of adipose tissue and fat storage throughout the body.
The second case study engaged genes related to keratin protein activity in both species. The third focused on skin and hair pigmentation variants in the genes MC1R and SLC7A11.
"Our observations present the likelihood of resemblance between numerous molecular variants that resulted in similar cold-adapted epigenetic traits of two species, both of which evolved in Eurasia from an African ancestor," said Meidad Kislev of TAU.
"These remarkable findings offer supporting evidence for the contention regarding the nature of convergent evolution through molecular resemblance, in which similarities in genetic variants between adapted species are present," Kislev said.
"We believe these types of connections can be valuable for future evolutionary research. They're especially interesting when they involve other large-brained mammals, with long life spans, complex social behaviour and their interactions in shared habitats with early humans," he added.
According to the study, both species likely hailed from ancestors that came to Europe from Africa and adapted to living conditions in Ice Age Europe. The species also both became extinct more or less at the same time.
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