Cited by 29Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchGenetic Associations and Epidemiology

Evidence for three loci modifying age‐at‐onset of Alzheimer's disease in early‐onset PSEN2 families

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Marchani, Elizabeth E., Bird, Thomas D., Steinbart, Ellen J., Rosenthal, Elisabeth, Yu, Chang‐En, Schellenberg, Gerard D., Wijsman, Ellen M.·2010·American Journal of Medical Genetics Part B: Neuropsychiatric Genetics

Abstract

Families with early‐onset Alzheimer's disease (AD) sharing a single PSEN2 mutation exhibit a wide range of age‐at‐onset, suggesting that modifier loci segregate within these families. While APOE is known to be an age‐at‐onset modifier, it does not explain all of this variation. We performed a genome scan within nine such families for loci influencing age‐at‐onset, while simultaneously controlling for variation in the primary PSEN2 mutation (N141I) and APOE. We found significant evidence of linkage between age‐at‐onset and chromosome 1q23.3 (P < 0.001) when analysis included all families, and to chromosomes 1q23.3 (P < 0.001), 17p13.2 (P = 0.0002), 7q33 (P = 0.017), and 11p14.2 (P = 0.017) in a single large pedigree. Simultaneous analysis of these four chromosomes maintained strong evidence of linkage to chromosomes 1q23.3 and 17p13.2 when all families were analyzed, and to chromosomes 1q23.3, 7q33, and 17p13.2 within the same single pedigree. Inclusion of major gene covariates proved essential to detect these linkage signals, as all linkage signals dissipated when PSEN2 and APOE were excluded from the model. The four chromosomal regions with evidence of linkage all coincide with previous linkage signals, associated SNPs, and/or candidate genes identified in independent AD study populations. This study establishes several candidate regions for further analysis and is consistent with an oligogenic model of AD risk and age‐at‐onset. More generally, this study also demonstrates the value of searching for modifier loci in existing datasets previously used to identify primary causal variants for complex disease traits. © 2010 Wiley‐Liss, Inc.

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  • Age at onset of Alzheimer's disease is highly heritable in both familial and sporadic forms, with predicted genetic contributions up to 78% in sporadic late-onset AD and over 90% in monogenic early-onset familial AD.

    “AAO of AD is highly heritable in both familial and sporadic forms of the disease, with predicted genetic contributions of up to 78% in the sporadic late-onset form,3, 4 and over 90% in a monogenic early-onset familial form.5”

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  1. Wijsman EM Amos CI Genetic analysis of simulated oligogenic traits in nuclear and extended pedigrees: Summary of GAW10 contributions Genet Epidemiol 1997 14 6 719 735 9433569
  2. Williams JT Duggirala R Blangero J Statistical properties of a variance components method for quantitative trait linkage analysis in nuclear families and extended pedigrees Genet Epidemiol 1997 14 6 1065 1070 9433625

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Authors
Marchani, E. E., Bird, T. D., Steinbart, E. J., Rosenthal, E., Yu, C., Schellenberg, G. D., & Wijsman, E. M.
Affiliations
  • University of Washington (US)
  • University of Pennsylvania (US)
Corresponding author
Wijsman, Ellen M.
Venue
American Journal of Medical Genetics Part B: Neuropsychiatric Genetics
Publisher
Wiley
Published
2010-06-24
Volume
153B
Issue
5
Pages
1031-1041
ISSN
  • 1552-4841 (ISSN-L)
  • 1552-485X
OpenAlex
W2102697598
Cited by
29
References
100
Citations by year
2026: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2019: 3 · 2018: 2 · 2017: 3 · 2016: 1 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 1
FWCI
1.95
Type
journal article
Language
en
Open access
Locations
  • American Journal of Medical Genetics Part B Neuropsychiatric Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • National Institutes of Health (1z01ag000258-03, Z01 AG000258)
  • National Institute on Aging (AG 05136, T32AG000258, P50AG005136)
  • National Institute of General Medical Sciences (R01GM046255, GM46255, R37GM046255)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
Alzheimer's disease, early-onset Alzheimer's disease, presenilin 2, age of onset, modifier loci, genetic linkage, apolipoprotein E, oligogenic inheritance, familial Alzheimer's disease, candidate genes
MeSH terms
Adult, Aged, Aged, 80 and over, Alzheimer Disease, Chromosomes, Human, Family, Genetic Markers, Germany, Humans, Genetic Linkage, Middle Aged, Genome, Human, Age of Onset, Chromosome Segregation, Quantitative Trait Loci, White People, Presenilin-2, Genetic Loci

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