Austin American-Statesman, Oct. 27, 2006 When he turns 18 in March, a McNeil High School senior will get the answer he's been waiting for. Jordan Brown has a 50 percent chance of inheriting the flawed gene that causes Huntington's disease. The degenerative disorder destroys the brain, affecting one's ability to work, speak and reason. Brown's mother, Alice Moore, was diagnosed with the disease five years ago, and that knowledge drove him to be tested.  To help raise awareness about Huntington's, Brown will participate in a 5K pledge walk Saturday in Round Rock.  . . . Currently there is no way to slow or stop the disease, though research is advancing and treatments for symptoms are available, said Dr. Tetsuo Ashizawa, a professor and chairman of neurology at the University of Texas Medical Branch who specializes in Huntington's. People typically die from complications from the disease.  Ashizawa said that, although there are exceptions, the community of Huntington's disease groups prefers for people to wait until they're 18 to get tested for the disease, partly because younger children may not be old enough to handle the emotional impact of a positive diagnosis.