Double-edged sword: when helpful genes begin to hinder

23 February 2022, Author: Amalyah Hart

The genetic quirk that makes some people seriously ill from COVID-19 actually protects them from HIV, according to a new Swedish study. It’s a suite of genes that was passed down to us by Neanderthals, and increased dramatically in frequency some 10,000 years ago, adding to the mystery of an already complicated genetic story. 

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