Monday, June 29, 2009

Gray Hair Signals Battered DNA

"The idea isn't far-fetched, says Ian Jackson, a geneticist at the Medical Research Council in Edinburgh, U.K. "Genotoxic stress happens to everyone over time, and its accumulation is the main cause of aging." The sun's ultraviolet radiation, household chemicals, and environmental pollutants can all cause genotoxic stress, as can normal metabolic processes in cells. A single cell in a healthy mammal can suffer as many as 100,000 DNA-damaging events in 1 day, says Nishimura."

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