Washington: A gene that you carry may begin to damage your brain a full 50 years before Alzheimer`s disease shows up, scientists say.In 1993, researchers discovered a gene known as ApoE4 -- carried by about a quarter of us -- that triples the risk for getting Alzheimer`s.In 2009, three more risky genes were discovered, and one of them, called clusterin or CLU, was found to up the risk of getting Alzheimer`s by 16 percent.
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