title: Genetic of Alzheimer's Disease: A Narrative Review Article.
abstract: BACKGROUND
  Alzheimer's disease (AD) is one of the most common problems for old peoples. Etiology of AD is not clear, but genetic factors play a major role in determining a person's risk to develop AD. Twin and family studies confirm that AD has a genetic basis. AD genetics has been split into two broad categories: early-onset and late-onset. EOAD cases are inherited in an autosomal dominant pattern. In this form, dominant mutations in genes like APP, PSEN-1 and PSEN-2 associated with AD. This study aimed to consider the role of genetic in AD.
  
  
  METHODS
  At the first, most of the references in relation with genetic basis of AD searched from the following web-sites: PubMed, Science direct, Wiley & Sons (1995-2014). Then, the most common genes and their affects described briefly.
  
  
  RESULTS
  Aging is the most obvious risk factor for developing AD. There is a genetic basis for AD, of course this relation is not complete but it is significant.
  
  
  CONCLUSIONS
  More than thousand genes studied in relation with Alzheimer's disease. Against the improvements in understanding different aspects of AD, the accurate genetic foundation of AD remain unclear.
authors.affiliation: Dept. of Clinical Psychology, Allame Tabataba'i University, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Khanahmadi
authors.affiliation: School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ; Dept. of Basic Sciences, Iranian Academy of Medical Sciences, Tehran, Iran.
authors.forename: Dariush D
authors.initials: DD
authors.lastname: Farhud
authors.affiliation: Dept. of Exceptional Children Psychology, Science & Research Branch, Islamic Azad University, Tehran, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Malmir
keywords: Alzheimer’s disease (AD); Early-onset type (EOAD); Genetic factors; Late-onset type (LOAD)