Scientists find genetic link to mental impairment in people with Down syndrome

From the CEC Smart News:

Stanford University scientists believe that having three copies of a gene located on chromosome 21, as people with Down Syndrome do, could contribute to the Alzheimer's-like mental deterioration many people with the syndrome experience by age 40. Lead researcher William Mobley says the next step is to identify the mechanism for the process that causes some brain cells to stop working properly and see if it can be "turned down." BBC (7/5)