Cited by 71Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchGenomics and Rare Diseases

On the identification of low allele frequency mosaic mutations in the brains of Alzheimer’s disease patients

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Sala Frigerio, Carlo, Lau, Pierre, Troakes, Claire, Deramecourt, Vincent, Gele, Patrick, Van Loo, Peter, Voet, Thierry, De Strooper, Bart·2015·Alzheimer's & Dementia

Abstract

INTRODUCTION: The cause of sporadic Alzheimer's disease (AD) remains unclear. Given the growing evidence that protein aggregates can spread in a "prion-like" fashion, we reasoned that a small population of brain cells producing such "prion-like" particles due to a postzygotic acquired mutation would be sufficient to trigger the disease. Deep DNA sequencing technology should in principle allow the detection of such mosaics. METHODS: To detect the somatic mutations of genes causing AD present in a small number of cells, we developed a targeted deep sequencing approach to scrutinize the genomic loci of APP, PSEN1, and PSEN2 genes in DNA extracted from the entorhinal cortex, one of the brain regions showing the earliest signs of AD pathology. We also included the analysis of the MAPT gene because mutations may promote tangle formation. We validated candidate mutations with an independent targeted ultradeep amplicon sequencing technique. RESULTS: We demonstrate that our approach can detect single-nucleotide mosaic variants with a 1% allele frequency and copy number mosaic variants present in as few as 10% of cells. We screened 72 AD and 58 control brain samples and identified three mosaic variants with low allelic frequency (∼1%): two novel MAPT variants in sporadic AD patients and a known PSEN2 variant in a Braak II control subject. Moreover, we detected both novel and known pathogenic nonmosaic heterozygous variants in PSEN1 and PSEN2 in this cohort of sporadic AD patients. DISCUSSION: Our results show that mosaic mutations with low allelic frequencies in AD-relevant genes can be detected in brain-derived DNA, but larger samples need to be investigated before a more definitive conclusion with regard to the pathogenicity of such mosaics can be made.

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Crossref · 10.1016/j.jalz.2015.02.007

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  • Additional somatic mutations in genes known to confer risk for AD such as APP and SORL1 have been identified in the brains of both EOAD and LOAD patients.

    “Additional somatic mutations in genes known to confer risk for AD such as APP and SORL1 [237] have been identified in the brains of both EOAD and LOAD patients [238, 239]”

    From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [239]

  • Neurons from AD patients have an enriched number of somatic variations not observed in peripheral DNA.

    “neurons from AD patients have been observed to have an enriched number of somatic variations not observed in peripheral DNA [239, 240]”

    From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [239]

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  1. Nussbaum R, McInnes R, Willard H. Thompson & Thompson genetics in medicine. 7th Edition. Elsevier; 2007. Q15

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Authors
Sala Frigerio, C., Lau, P., Troakes, C., Deramecourt, V., Gele, P., Van Loo, P., Voet, T., & De Strooper, B.
Affiliations
  • VIB Center for the Biology of Disease KU Leuven Leuven Belgium
  • KU Leuven (BE)
  • King's College London (GB)
  • Université Lille Nord de France (FR)
  • Université Lille Nord de France UDSL Lille France
  • Center for Human Genetics KU Leuven Leuven Belgium
  • Wellcome Sanger Institute (GB)
Corresponding author
Voet, Thierry
Venue
Alzheimer's & Dementia
Publisher
Wiley
Published
2015-04-28
Volume
11
Issue
11
Pages
1265-1276
ISSN
  • 1552-5260 (ISSN-L)
  • 1552-5279
OpenAlex
W2005742709
Cited by
71
References
52
Citations by year
2026: 3 · 2025: 4 · 2024: 3 · 2023: 4 · 2022: 7 · 2021: 7 · 2020: 9 · 2019: 5 · 2018: 13 · 2017: 8 · 2016: 5 · 2015: 3
FWCI
7.12
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s & Dementia (publishedVersion)
  • PubMed (publishedVersion)
  • Lirias (KU Leuven) (submittedVersion, other-oa)
  • UCL Discovery (University College London) (submittedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
  • Fonds voor wetenschappelijk onderzoek
  • Methusalem grant
  • Advanced ERC grant
  • COEN
  • Medical Research Council
  • Alzheimer's Society
  • Alzheimer's Research UK
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 › Genomics and Rare Diseases
Keywords
Alzheimer's disease, somatic mosaicism
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Gene Frequency, Humans, Mosaicism, Mutation, Pilot Projects, Cohort Studies, Amyloid beta-Protein Precursor, tau Proteins, Sequence Analysis, DNA, Entorhinal Cortex, Polymorphism, Single Nucleotide, Presenilin-1, Presenilin-2, DNA Copy Number Variations, High-Throughput Nucleotide Sequencing

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