Cited by 515Alzheimer's disease research and treatmentsDNA Repair MechanismsDementia and Cognitive Impairment Research

Oxidative DNA damage in mild cognitive impairment and late-stage Alzheimer's disease

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Lovell, M. A., Markesbery, W. R.·2007·Nucleic Acids Research

Abstract

Increasing evidence supports a role for oxidative DNA damage in aging and several neurodegenerative diseases including Alzheimer's disease (AD). Attack of DNA by reactive oxygen species (ROS), particularly hydroxyl radicals, can lead to strand breaks, DNA-DNA and DNA-protein cross-linking, and formation of at least 20 modified bases adducts. In addition, alpha,beta-unsaturated aldehydic by-products of lipid peroxidation including 4-hydroxynonenal and acrolein can interact with DNA bases leading to the formation of bulky exocyclic adducts. Modification of DNA bases by direct interaction with ROS or aldehydes can lead to mutations and altered protein synthesis. Several studies of DNA base adducts in late-stage AD (LAD) brain show elevations of 8-hydroxyguanine (8-OHG), 8-hydroxyadenine (8-OHA), 5-hydroxycytosine (5-OHC), and 5-hydroxyuracil, a chemical degradation product of cytosine, in both nuclear and mitochondrial DNA (mtDNA) isolated from vulnerable regions of LAD brain compared to age-matched normal control subjects. Previous studies also show elevations of acrolein/guanine adducts in the hippocampus of LAD subjects compared to age-matched controls. In addition, studies of base excision repair show a decline in repair of 8-OHG in vulnerable regions of LAD brain. Our recent studies show elevated 8-OHG, 8-OHA, and 5,6-diamino-5-formamidopyrimidine in both nuclear and mtDNA isolated from vulnerable brain regions in amnestic mild cognitive impairment, the earliest clinical manifestation of AD, suggesting that oxidative DNA damage is an early event in AD and is not merely a secondary phenomenon.

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Authors
Lovell, M. A., & Markesbery, W. R.
Affiliations
University of Kentucky (US)
Corresponding author
Lovell, M. A.
Venue
Nucleic Acids Research
Published
2007-11-26
Volume
35
Issue
22
Pages
7497-7504
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W1967899016
Cited by
515
References
78
Citations by year
2026: 18 · 2025: 23 · 2024: 25 · 2023: 31 · 2022: 39 · 2021: 35 · 2020: 32 · 2019: 25 · 2018: 20 · 2017: 27 · 2016: 21 · 2015: 26 · 2014: 19 · 2013: 25 · 2012: 29
FWCI
2.95
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • UKnowledge (University of Kentucky) (submittedVersion, cc-by-nc)
Funders
National Institute on Aging (P30AG028383, P01AG005119)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
oxidative DNA damage, Alzheimer's disease, mild cognitive impairment, reactive oxygen species, hydroxyl radicals, DNA base adducts, 8-oxoguanine, 5-hydroxycytosine, 4-hydroxynonenal, acrolein, lipid peroxidation, mitochondrial DNA, base excision repair, hippocampus, aging
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Cognition Disorders, DNA, DNA Damage, DNA Repair, Humans, Oxidation-Reduction, Oxidative Stress

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