Based on a genome scan from his wife's company, 23andMe, Google's Sergey Brin learned that he has a mutation of the LRRK2 gene that accounts for a good portion of familial Parkinson's disease. (Brin's mother, Eugenia, has Parkinson's and her genome scan shows the same mutation.) On his blog, called too, Brin writes that the implications of this finding are not completely clear, though he seems to have a higher chance of developing Parkinson's than the average person. He also says that he can now take measures to reduce his risk and to support Parkinson's research.
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