Why does a deadly genetic disorder persist in the human population for millennia?
In short: Sickle cell disease causes immense suffering, including chronic pain, organ damage, and early death. Yet, this condition has endured for thousands of years. This video explores the biology behind the disease and the surprising evolutionary advantage that explains its persistence.
Sickle cell disease, or sickle cell anaemia, is an inherited disorder caused by a defective gene that forces red blood cells into a crescent shape. This structural change leads to severe symptoms, including tissue necrosis, organ failure, and increased vulnerability to infections. The disease affects approximately 8 million people globally and results in over 34,000 deaths annually.
While often mischaracterized as a condition exclusively affecting Black populations due to its prevalence in Sub-Saharan Africa, the disease's persistence is tied to an unexpected evolutionary trade-off. Understanding this mechanism provides insight into how a lethal genetic mutation can remain embedded in human biology over thousands of years.
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Sources
- Summary by Intellect · source: The Incredible Biology of Sickle Cell
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