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Scientists at US Temple University have published a study revealing that modern humans who lived in Europe 100,000 years ago had sex with Neanderthals, who came from Africa, at a much higher frequency than adults. we did not think so before.
The DNA of all humans today – with the exception of that of Africans – contains a small percentage of the Neanderthal genome. This is between 2% and 6%, according to the study. Neanderthals have spread to Europe and Asia with modern humans.
"We have found […] that a simple model of a simple intersection [entre ambas as espécies] did not coincide with empirical evidence and was consistent with cross-referencing of multiple genes between European and Asian populations. There has been a much more lasting interaction than humans with Neanderthals, "explain the scientists.
Research indicates that the proportion of Neanderthal descendants among current East Asian populations is 12% to 20% higher than that in the European genome. These variations in gene expression affect our propensity for disease.
To summarize the asymmetric model of the Neanderthal allelic frequencies, the frequency spectrum of the Neanderthal fragments of Europe and East Asia was compiled for comparison with the analytic theory and simulated data under various models of gene mixing.
Thus, we believe that a likely explanation of our findings is that gene flow between humans and Neanderthals was intermittent and continuous, but in a geographically restricted area.
In addition, the study confirms that Neanderthals and modern humans have not only had sex once and with each other, but also with the Denisovan, a subspecies of human beings whose only dead body found corresponds to the finger of a girl living in a cave in Siberia between 50 000 and 30 000 years.
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