Dna Damage Accumulating Neurons In Neurodegeneration is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
DNA damage accumulation in neurons represents a fundamental pathological mechanism in neurodegenerative diseases. Neurons, as post-mitotic cells with high metabolic demand and limited regenerative capacity, are particularly vulnerable to DNA lesions. The progressive accumulation of DNA damage contributes to neuronal dysfunction, transcriptional alterations, and ultimately cell death in Alzheimer's disease, Parkinson's disease, Huntington's disease, ALS, and other neurodegenerative disorders.
| Property | Value |
|----------|-------|
| Category | Vulnerable Neuronal Phenotypes |
| Cell Type | Neurons with accumulated DNA damage |
| Associated Diseases | AD, PD, HD, ALS, FTD |
| Mechanisms | Oxidative damage, repair deficits, replication stress |
- Oxidative lesions: 8-oxoguanine (8-oxoG), FapyG
- Single-strand breaks: Due to reactive oxygen species (ROS)
- Double-strand breaks: Replication stress, resection
- Base alkylation: From cellular metabolism
- Intrastrand crosslinks: From lipid peroxidation products
- UV-induced lesions: Cyclobutane pyrimidine dimers (CPDs)
- Ionizing radiation: Double-strand breaks
- Chemical mutagens: Alkylating agents
- Environmental toxins: Pesticides, metals
- Glycosylases: OGG1, NTH1, NEIL1-3
- AP endonuclease (APE1): Incision at abasic sites
- DNA polymerase β: Gap filling
- Ligase III/XRCC1: Nick sealing
- Global genome NER (GG-NER): XPC complex
- Transcription-coupled NER (TC-NER): CSA, CSB proteins
- XPA-XPG: Verification and excision
- MSH2-MSH3, MSH2-MSH6: Mismatch recognition
- MLH1-PMS2: Post-replicative repair
¶ Double-Strand Break Repair
- Homologous recombination (HR): BRCA1/2, RAD51
- Non-homologous end joining (NHEJ): Ku70/Ku80, DNA-PKcs
- Alternative NHEJ: LIG3, PARP1
- 8-oxoguanine accumulation: In neurons and glia
- DNA strand breaks: Increased in AD brain
- Telomere shortening: Accelerated in AD neurons
- Mitochondrial DNA mutations: Accumulation with age
- Hippocampal CA1: Vulnerable to oxidative damage
- Entorhinal cortex: Early tau pathology
- Prefrontal cortex: Executive function deficits
- Basal forebrain: Cholinergic neuron vulnerability
- Amyloid-beta toxicity: Increases oxidative stress
- Tau pathology: Impairs DNA repair
- Mitochondrial dysfunction: ROS overproduction
- Neuroinflammation: Microglial oxidative burst
- 8-oxoG accumulation: In substantia nigra neurons
- Complex I deficiency: Mitochondrial ROS
- Nuclear DNA damage: PARP activation
- mtDNA deletions: Accumulation in SNc neurons
- Substantia nigra pars compacta: Highest vulnerability
- Locus coeruleus: Noradrenergic neurons
- Vagal nucleus: Early involvement
- MPTP/6-OHDA: Environmental toxins
- α-Synuclein aggregation: Impairs DNA repair
- PINK1/Parkin dysfunction: Mitochondrial DNA damage
- DJ-1 mutations: Oxidative stress response
- Elevated 8-oxoG: Throughout HD brain
- Double-strand breaks: In neurons
- DNA repair gene alterations: PolyQ effects
- Transcription-coupled repair deficit: CAG repeat effects
- Striatum: Most affected
- Cortex: Executive dysfunction
- Hippocampus: Memory impairment
- Mutant huntingtin: DNA binding and damage
- Transcription dysfunction: R-loop formation
- DNA repair protein sequestration: By polyQ expansions
- Oxidative stress: Mitochondrial dysfunction
- DNA strand breaks: Increased in motor neurons
- Base excision repair deficit: Repair enzyme dysfunction
- Oxidative lesions: 8-oxoG accumulation
- R-loop accumulation: Transcription-replication conflicts
- Motor neurons: Upper and lower
- Cortical pyramidal neurons: TDP-43 pathology
- Dorsal horn neurons: Sensory involvement
- SOD1 mutations: Oxidative stress
- C9orf72: RNA foci and dipeptide repeats
- TDP-43 pathology: DNA repair impairment
- FUS mutations: DNA damage response
- NER efficiency reduction: With aging
- BER capacity decline: In neurons
- Chromatin remodeling deficits: Epigenetic changes
- TC-NER defects: In Alzheimer's disease
- BER enzyme reduction: In Parkinson's disease
- HR impairment: In ALS
- PARP inhibitors: Reduce cell death
- BER pathway activation: OGG1, APE1 enhancement
- Antioxidants: Reduce oxidative damage
- NAD⁺ boosters: Support DNA repair enzymes
- DNA repair gene delivery: Viral vectors
- Base editor therapy: Correct point mutations
- CRISPR-Cas9: Gene correction strategies
- 8-oxodG in urine: Systemic oxidative DNA damage
- 8-oxodG in blood: Oxidative stress marker
- DNA repair capacity: Lymphocyte assays
- PET ligands: For DNA damage visualization
- Magnetic resonance spectroscopy: Metabolic changes
- 8-oxoguanine: Neuronal DNA damage
- DNA repair proteins: Biomarker potential
- Coppedè & Migliore, DNA damage and repair in AD (2015)
- Shanbhag et al., Early DNA damage in AD brain (2019)
- Nakabeppu, DNA damage in Parkinson's disease (2014)
- Browne et al., DNA damage in Huntington's disease (1997)
- Kaušp et al., DNA repair in ALS (2019)
- Barzilai et al., DNA damage in aging and neurodegeneration (2013)
- Madabhushi et al., Activity-induced DNA breaks in neurons (2014)
- Suberbielle et al., Physiologic neuronal activity leads to DNA damage (2013)