New gene triples risk for Alzheimer's disease

Scientists have identified a new gene variant that seems to strongly raise the risk for Alzheimer's disease, giving a fresh target for research into treatments for the mind-robbing disorder.

The problem gene is not common — less than 1 percent of people are thought to have it — but it roughly triples the chances of developing Alzheimer's compared to people with the normal version of the gene. It also seems to harm memory and thinking in older people without dementia.