Humans may be just as vulnerable to environmental change as other animals, according to our new research analyzing genetic data from more than a thousand people who lived across Europe and Asia over the past 45,000 years.
analyzing genetic data from more than a thousand people who lived across Europe and Asia over the past 45,000 years.
Our results show humans' famed ability to adapt our behavior and develop new tools and techniques has not always been enough to survive when times have grown tough.Modern humans live in a huge variety of natural environments, from the frozen Arctic to sweltering tropical rainforest. Individuals with genetic variations that make them better equipped to deal with the new conditions will tend to leave more offspring. As a result, these beneficial variants become more common in future generations.
We thought these events might have erased historical sweep signals from modern human genomes – but that ancient genomes predating these intermixing events may still retain traces of the signals.among the hunter-gatherers living in Europe than there is among the humans living there today. We wondered: could these relatively recent mixing events have masked historical selective sweeps, so they were invisible in modern human genomes?
We compared selection signals in ancient genomes with those from modern genomes. The ancient data contained many more hard sweep signals than the modern samples. More recent sweeps were particularly prone to erasure, due to being rare or absent in at least one of the mixing populations.
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