https://www.eurekalert.org/news-releases/943854
News Release 21-Feb-2022
A COVID-19 risk variant inherited from Neandertals reduces a person’s risk of contracting HIV by 27 percent
Peer-Reviewed Publication
Max Planck Institute for Evolutionary Anthropology
Some people become seriously ill when infected with SARS-CoV-2 while others have only mild symptoms or no symptoms at all. In addition to risk factors such as advanced age and chronic diseases, like diabetes, our genetic heritage also contributes to our individual COVID-19 severity risk.
In the autumn of 2020, Hugo Zeberg at Karolinska Institutet and MPI-EVA and Svante Pääbo at MPI-EVA showed that we inherited the major genetic risk factor for severe COVID-19 from Neandertals. In the spring of 2021, the same researcher duo studied this variant in ancient human DNA and observed that its frequency has increased significantly since the last ice age. In fact, it has become unexpectedly common for a genetic variant inherited from Neandertals. Hence, it may have had a favourable impact on its carriers in the past. “This major genetic risk factor for COVID-19 is so common that I started wondering whether it might actually be good for something, such as providing protection against another infectious disease”, says Hugo Zeberg, who is the sole author of the new study in PNAS.
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However, since HIV only arose during the 20th century, protection against this infectious disease cannot explain why the genetic risk variant for COVID-19 became so common among humans as early as 10,000 years ago. “Now we know that this risk variant for COVID-19 provides protection against HIV. But it was probably protection against yet another disease that increased its frequency after the last ice age”, Zeberg concludes.
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