Alzheimer disease (AD) is a neurodegenerative disease of the brain that is divided into early- and late-onset groups. AD is characterized by the build up of amyloid plaques, neurofibrillary tangles and the loss of connections between neurons.  It is the most common type of dementia especially in the elderly.  The exact causes of AD are elusive at the moment but are most likely the result of genetics and other factors.  Scientist have been working hard to identify individual and or groups of genes responsible for the disease.  Although the scientific community has identified may genes involved in early and late More >