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Am J Neurodegener Dis. 2016 Mar 01;5(1):94-101. eCollection 2016.

The presenilin 1 p.Gly206Ala mutation is a frequent cause of early-onset Alzheimer's disease in Hispanics in Florida.

American journal of neurodegenerative disease

Thomas A Ravenscroft, Cyril Pottier, Melissa E Murray, Matt Baker, Elizabeth Christopher, Denise Levitch, Patricia H Brown, Warren Barker, Ranjan Duara, Maria Greig-Custo, Ana Betancourt, Mara English, Xiaoyan Sun, Nilüfer Ertekin-Taner, Neill R Graff-Radford, Dennis W Dickson, Rosa Rademakers

Affiliations

  1. Department of Neuroscience, Mayo Clinic Jacksonville, FL, 32224 USA.
  2. Wien Center for Alzheimer's Disease and Memory Disorders, Mount Sinai Medical Center Miami Beach, FL, 32224 USA.
  3. McKnight Brain Institute, Miller School of Medicine, University of Miami Miami, FL, 32224 USA.
  4. Department of Neuroscience, Mayo ClinicJacksonville, FL, 32224 USA; Department of Neurology, Mayo ClinicJacksonville, FL, 32224 USA.
  5. Department of Neurology, Mayo Clinic Jacksonville, FL, 32224 USA.

PMID: 27073747 PMCID: PMC4788736

Abstract

Mutations in the gene encoding the presenilin-1 protein (PSEN1) were first discovered to cause Alzheimer's disease (AD) 20 years ago. Since then more than 200 different pathogenic mutations have been reported, including a p.Gly206Ala founder mutation in the Hispanic population. Here we report mutation analysis of known AD genes in a cohort of 27 early-onset (age of onset ≤65, age of death ≤70) Hispanic patients ascertained in Florida. The PSEN1 p.Gly206Ala mutation was identified in 13 out of 27 patients (48.1%), emphasizing the importance of this specific mutation in the etiology of early-onset AD in this population. One other patient carried the known PSEN1 p.Gly378Val mutation. Genotyping of the PSEN1 p.Gly206Ala and p.Gly378Val mutations in 63 late-onset Hispanic AD patients did not identify additional mutation carriers. All p.Gly206Ala mutation carriers shared rare alleles at two microsatellite markers flanking PSEN1 supporting a common founder. This study confirms the p.Gly206Ala variant as a frequent cause of early onset AD in the Hispanic population and for the first time reports the high frequency of this mutation in Hispanics in Florida.

Keywords: Alzheimer’s disease; Hispanic; diagnosis; early-onset; founder mutation; presenilin 1

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