Cited by 102Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchAmyotrophic Lateral Sclerosis Research

Somatic and germline mosaicism in sporadic early-onset Alzheimer's disease

Beck, J. A.·2004·Human Molecular Genetics

Abstract

Alzheimer's disease (AD) is the commonest neurodegenerative disease worldwide. Rare familial cases may be caused by mutations in one of three genes-amyloid precursor protein, presenilin-1 and presenilin-2; however, the molecular basis of >99% of AD cases is unknown. Somatic mutation has been considered to be a mechanism that may account for a proportion of sporadic cases of AD, but to date there has been no evidence for this. We now report a sporadic early-onset patient with AD, and show that this individual is a somatic mosaic for a mutation in the presenilin-1 gene, suggesting a novel molecular mechanism for AD. Quantification of the mosaicism demonstrated the degree of mosaicism at 8% in peripheral lymphocytes and 14% in cerebral cortex in the index patient; a clear gene dosage effect on age of presentation and clinical phenotypic presentation is demonstrated. This finding has important implications for the aetiology of sporadic AD, and for other apparently sporadic neurodegenerative diseases such as Parkinson's disease, motor neuron disease and Creutzfeldt-Jakob disease.

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  • A sporadic AD patient harbored a disease-causative mutation in PSEN1 only in approximately 14% of brain cells.

    “the finding of a sporadic AD patient who harbored a disease-causative mutation in PSEN1 only in approximately 14% of brain cells [236]”

    From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [236]

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Authors
Beck, J. A.
Affiliations
MRC Prion Unit (GB)
Corresponding author
Beck, J. A.
Venue
Human Molecular Genetics
Published
2004-04-28
Volume
13
Issue
12
Pages
1219-1224
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2109880206
Cited by
102
References
19
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 5 · 2022: 8 · 2021: 7 · 2020: 8 · 2019: 4 · 2018: 10 · 2017: 6 · 2016: 4 · 2015: 10 · 2014: 5 · 2013: 5 · 2012: 2
FWCI
1.24
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
Medical Research Council
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
Alzheimer's disease, somatic mosaicism, germline mosaicism, presenilin 1, presenilin 2, amyloid precursor protein, somatic mutations, gene dosage effect, age of onset, cerebral cortex, lymphocytes
MeSH terms
Adult, Alzheimer Disease, Base Sequence, Female, Humans, Male, Membrane Proteins, Middle Aged, Mosaicism, Pedigree, Age of Onset, Germ-Line Mutation, Presenilin-1

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