Why Humans Lost Uricase: Evolutionary Insights from Ancient Enzymes
Dr. Kumar’s Take
This study used a fascinating approach called ancestral sequence reconstruction to “resurrect” ancient versions of uricase, the enzyme that breaks down uric acid. What they found was that uricase did not suddenly disappear in humans and apes. Instead, it weakened step by step across millions of years before finally being shut down. This gradual loss likely helped our ancestors survive by storing more fat from fruit sugar (fructose) during times of food shortage. But today, that same genetic change contributes to high uric acid levels, gout, obesity, and metabolic disease.