Cited by 320Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchAmyotrophic Lateral Sclerosis Research

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Rare variants in APP, PSEN1 and PSEN2 increase risk for AD in late-onset Alzheimer’s disease families

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Abstract

Pathogenic mutations in APP, PSEN1, PSEN2, MAPT and GRN have previously been linked to familial early onset forms of dementia. Mutation screening in these genes has been performed in either very small series or in single families with late onset AD (LOAD). Similarly, studies in single families have reported mutations in MAPT and GRN associated with clinical AD but no systematic screen of a large dataset has been performed to determine how frequently this occurs. We report sequence data for 439 probands from late-onset AD families with a history of four or more affected individuals. Sixty sequenced individuals (13.7%) carried a novel or pathogenic mutation. Eight pathogenic variants, (one each in APP and MAPT, two in PSEN1 and four in GRN) three of which are novel, were found in 14 samples. Thirteen additional variants, present in 23 families, did not segregate with disease, but the frequency of these variants is higher in AD cases than controls, indicating that these variants may also modify risk for disease. The frequency of rare variants in these genes in this series is significantly higher than in the 1,000 genome project (p = 5.09 × 10⁻⁵; OR = 2.21; 95%CI = 1.49-3.28) or an unselected population of 12,481 samples (p = 6.82 × 10⁻⁵; OR = 2.19; 95%CI = 1.347-3.26). Rare coding variants in APP, PSEN1 and PSEN2, increase risk for or cause late onset AD. The presence of variants in these genes in LOAD and early-onset AD demonstrates that factors other than the mutation can impact the age at onset and penetrance of at least some variants associated with AD. MAPT and GRN mutations can be found in clinical series of AD most likely due to misdiagnosis. This study clearly demonstrates that rare variants in these genes could explain an important proportion of genetic heritability of AD, which is not detected by GWAS.

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Figure 1 Pedigrees for some of the sequenced families illustrating the presence of phenocopies and low penetrance mutations or the presence of presymptomatic cases. A) Pedigree for a family with the PSEN1 A79V mutation. B) Pedigree for a family with the GRN R493X mutation. AO indicates the subject or family report of age of onset of symptoms. AE = the age of last evaluation. MCI: Mild cognitive impairment or questionable dementia by family report.+symbol indicates that the subject is positive for the indicated mutation.−symbol indicates that the subject is negative for the indicated mutation. A number inside of a diamond indicates the number of subjects with the same status. Fully shaded circles or squares indicate confirmed AD by autopsy. Three/fourths shaded symbol indicates probable AD diagnosed using NINCDS-ADRDA criteria. One/fourth shaded symbol indicates that the family reports this individual has AD.
Figure 1 Pedigrees for some of the sequenced families illustrating the presence of phenocopies and low penetrance mutations or the presence of presymptomatic cases. A) Pedigree for a family with the PSEN1 A79V mutation. B) Pedigree for a family with the GRN R493X mutation. AO indicates the subject or family report of age of onset of symptoms. AE = the age of last evaluation. MCI: Mild cognitive impairment or questionable dementia by family report.+symbol indicates that the subject is positive for the indicated mutation.−symbol indicates that the subject is negative for the indicated mutation. A number inside of a diamond indicates the number of subjects with the same status. Fully shaded circles or squares indicate confirmed AD by autopsy. Three/fourths shaded symbol indicates probable AD diagnosed using NINCDS-ADRDA criteria. One/fourth shaded symbol indicates that the family reports this individual has AD.CC BY · PubMed Central

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Metadata

Authors
Cruchaga, C., Chakraverty, S., Mayo, K., Vallania, F. L. M., Mitra, R. D., Faber, K., Williamson, J., Bird, T., Diaz-Arrastia, R., Foroud, T. M., Boeve, B. F., Graff-Radford, N. R., St. Jean, P., Lawson, M., Ehm, M. G., Mayeux, R., Goate, A. M., & for the NIA-LOAD/NCRAD Family Study Consortium
Affiliations
  • Washington University in St. Louis (US)
  • Indiana University Indianapolis (US)
  • Columbia University (US)
  • University of Washington (US)
  • The University of Texas Southwestern Medical Center (US)
  • Mayo Clinic (US)
  • GlaxoSmithKline (United States) (US)
Corresponding author
  • Cruchaga, Carlos
  • Goate, Alison M.
Venue
PLoS ONE
Published
2012-02-01
Volume
7
Issue
2
Pages
e31039
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2023381648
Cited by
320
References
66
Citations by year
2026: 15 · 2025: 14 · 2024: 23 · 2023: 12 · 2022: 20 · 2021: 25 · 2020: 25 · 2019: 10 · 2018: 22 · 2017: 28 · 2016: 26 · 2015: 22 · 2014: 29 · 2013: 32 · 2012: 17
FWCI
21.43
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • U.S. Department of Veterans Affairs
  • Massachusetts General Hospital
  • University of Southern California
  • University of Pennsylvania (U24 AG026395)
  • Northwestern University
  • Foundation for Barnes-Jewish Hospital
  • University of Washington
  • University of Pittsburgh
  • Rush University
  • National Institutes of Health (5p30ns069329-02, 5r37ag015473-15)
  • University of California, Los Angeles
  • National Institute on Aging (AG 16208, R37AG15473, R37-AG015473, AG21886, R01AG035083, U24 AG21886, P 50 AG05681, R01AG041797, P50AG008702, P50AG005681, P01 AG0 3991, P01AG003991, AG035083, U24AG026395, P30AG013846, R01AG016208, AG026395, U24AG056270, P01AG026276, U24AG021886)
  • National Institute of Mental Health (R01MH060009)
  • National Institute of Neurological Disorders and Stroke (P30-NS069329, 1P30NS069329-01)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Clinical Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
late-onset Alzheimer's disease, familial Alzheimer's disease, rare variants, APP, presenilin 1, presenilin 2, MAPT, gene regulatory networks, pathogenic variants, genetic risk, heritability, novel variants, age of onset, penetrance, misdiagnosis, mutation detection
MeSH terms
Progranulins, Adult, Aged, Aged, 80 and over, Alzheimer Disease, Female, Humans, Male, Middle Aged, Mutation, Pedigree, Amyloid beta-Protein Precursor, tau Proteins, Genetic Predisposition to Disease, Intercellular Signaling Peptides and Proteins, Presenilin-1, Presenilin-2

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