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J Mol Neurosci. 2016 Nov;60(3):316-324. Epub 2016 Aug 6.

The Neurobiology and Age-Related Prevalence of the ε4 Allele of Apolipoprotein E in Alzheimer's Disease Cohorts.

Author information

1
University of Melbourne, The Florey Institute of Neuroscience and Mental Health, 30 Royal Parade, Parkville, VIC, 3052, Australia.
2
Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC, Australia.
3
School of Biosciences, University of Melbourne, Parkville, VIC, Australia.
4
University of Melbourne, The Florey Institute of Neuroscience and Mental Health, 30 Royal Parade, Parkville, VIC, 3052, Australia. blaine.roberts@florey.edu.au.
5
Cooperative Research Centre for Mental Health, Parkville, VIC, Australia. blaine.roberts@florey.edu.au.

Abstract

Alzheimer's disease (AD) is a progressive neurodegenerative disease characterised by amyloid beta (Aβ) plaques and tau neurofibrillary tangles in the brain. Human apolipoprotein E (ApoE) is a lipid transport protein coded by the polymorphic APOE gene, with three major alleles: ε2, ε3 and ε4. After age, the ε4 allele is the greatest risk factor for developing sporadic AD, conferring an increased risk of 3-4 and 8-12 times for one or two copies of the allele, respectively. This risk is reported to vary by demographic factors including sex, ethnicity and geography. In order to understand the risk of ApoE ε4 in relation to age, the primary risk factor for developing AD, we need to understand how the prevalence of APOE genotypes changes with age. Here, we present the first data on age-related prevalence of APOE ε4 in AD in three AD cohorts in Australia and the USA. There is a significant association between age and ε4 prevalence, particularly for ε4 homozygotes, such that as age increases the prevalence of ε4 decreases. Further studies on a random, population-based sample of the population are needed to provide more generalizable data, particularly in the >90-year-old age group.

KEYWORDS:

APOE; Alzheimer’s disease; Apolipoprotein E; Population demographics

PMID:
27498201
PMCID:
PMC5531868
DOI:
10.1007/s12031-016-0804-x
[Indexed for MEDLINE]
Free PMC Article

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