High-Altitude Adaptation Evolved Multiple Times in Humans

High-Altitude Adaptation Evolved Independently in Multiple Human Populations

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Discovery

Curated by Surfaced Editorial·Evolutionary Biology·2 min read

Genetic studies, notably by researchers at the University of California, Berkeley and the University of Utah, have revealed that human populations living at high altitudes, such as Tibetans, Andeans, and Ethiopians, have independently evolved distinct genetic adaptations to cope with low oxygen levels. Tibetans show adaptations like higher breathing rates and altered hemoglobin oxygen saturation through an *EPAS1* gene variant, while Andeans have larger lung capacities and increased red blood cell production, and Ethiopians exhibit mechanisms that prevent polycythemia. These distinct genetic pathways to similar physiological outcomes highlight powerful convergent evolution within our own species. This demonstrates the remarkable plasticity of the human genome and its ability to adapt to extreme environmental pressures within relatively short evolutionary timescales.

Why It’s Fascinating

The discovery that different human groups independently evolved distinct genetic solutions to high-altitude hypoxia is remarkable, showing the power of natural selection within our own species. This confirms the concept of convergent evolution even within a single species, overturning previous assumptions that such adaptations might follow a single, universal genetic path. Within 5-10 years, understanding these varied genetic mechanisms could lead to new treatments for hypoxia-related conditions, such as acute mountain sickness or even chronic lung diseases. Imagine different groups of mountaineers, without consulting each other, independently inventing unique yet effective breathing techniques and gear modifications for scaling high peaks. Medical researchers, geneticists, and physiologists are the primary beneficiaries. What other subtle, yet profound, human adaptations are still hidden in our genomes?

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