Rare Genetic Mutation Could Hold Key to Preventing Dementia, Study Finds

More than 55 million people worldwide are living with dementia, but researchers have identified individuals who share a rare genetic predisposition to developing a type of the disease. The discovery raises the possibility that studying these families could unlock new ways to predict, treat, or even prevent Alzheimer's and other forms of dementia. Horizons moderator William Brangham explores the research with Robert Kolker, examining what makes these cases unusual and how they might inform broader scientific understanding. The conversation looks at the potential for translating these findings into practical approaches for at-risk populations. The segment is part of PBS News' ongoing coverage of health and science, bringing viewers in-depth reporting on developments that could shape the future of dementia care and prevention.