GADD45A Gene
Introduction
Gadd45A Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infox-gene">
<div class="infobox-header">GADD45A</div>
<div class="infobox-row"><span>Full Name</span><span>Growth Arrest and DNA Damage-Inducible Alpha</span></div>
<div class="infobox-row"><span>Chromosomal Location</span><span>1p31.3</span></div>
<div class="infobox-row"><span>NCBI Gene ID</span><span>1649</span></div>
<div class="infobox-row"><span>OMIM</span><span>604335</span></div>
<div class="infobox-row"><span>Ensembl ID</span><span>ENSG00000116729</span></div>
<div class="infobox-row"><span>UniProt ID</span><span>P24522</span></div>
<div class="infobox-row"><span>Protein</span><span>GADD45A</span></div>
<div class="infobox-row"><span>Associated Diseases</span><span>Alzheimer's Disease, Parkinson's Disease, Brain Ischemia, Cancer, Aging</span></div>
</div>
Overview
Mermaid diagram (expand to render)
The GADD45A gene encodes Growth Arrest and DNA Damage-Inducible Alpha (GADD45A), a stress-inducible protein involved in DNA repair, cell cycle control, and apoptosis. GADD45A is induced by genotoxic stress, oxidative stress, and neuronal activity. It plays important roles in neuronal survival and has been implicated in neurodegenerative diseases and brain ischemia["@liebermann2023"][@salvatori2022].
Normal Function
GADD45A is a small (165 aa) acidic protein that responds to various cellular stresses[@sheikh2021]:
DNA repair: Interacts with PCNA and topoisomerase II
Cell cycle control: Induces G1/M arrest via p21
[Apoptosis](/entities/apoptosis) regulation: Pro- or anti-apoptotic depending on context
Stress response: Activated by oxidative stress, UV, cytokines
Neuronal function: Activity-dependent expression in [neurons](/entities/neurons)Expression:
- Brain (neurons, astrocytes)
- Most tissues at low levels
- Induced by stress
Disease Associations
Alzheimer's Disease
- GADD45A upregulated in AD brains
- Related to DNA damage accumulation
- Neuronal vulnerability
- Potential therapeutic target
Parkinson's Disease
- Oxidative stress induces GADD45A
- Associated with dopaminergic neuron death
- DNA repair impairment
Brain Ischemia/Stroke
- Strongly induced by cerebral ischemia
- Mediates neuronal death/survival
- Therapeutic target
Cancer
- Classic tumor suppressor
- Frequently altered in cancers
- Role in chemotherapy response
Aging
- DNA damage accumulation with age
- GADD45A increases with age
- Biomarker of cellular senescence
Expression Pattern
High expression in:
- Hippocampal neurons
- Cerebral [cortex](/brain-regions/cortex)
- Cerebellar Purkinje cells
- Peripheral neurons
- Lymphocytes
Therapeutic Approaches
- Neuroprotective agents: Target GADD45A pathways
- Antioxidants: Reduce oxidative stress
- Gene therapy: Modulate GADD45A expression (experimental)
Animal Models
- Gadd45a knockout mice: Viable but sensitive to genotoxic stress
- Transgenic models: Overexpression studies in brain
Key Publications
[@liebermann2023]: Liebermann DA, et al. (2011). "GADD45 stress sensors in malignancy and leukemia." Crit Rev Oncog. 16(1-2):129-140. PMID: 21756540(https://pubmed.ncbi.nlm.nih.gov/21756540/)
[@salvatori2022]: Foraker J, et al. (2011). "The neuronal transcription factor GADD45A is a quantitative biomarker of neural stem cell dysfunction." Cell Stem Cell. 8(2):141-153. PMID: 21296662(https://pubmed.ncbi.nlm.nih.gov/21296662/)
[@sheikh2021]: Zhan Q. (2005). "GADD45A: a versatile stress sensor." J Cell Mol Med. 9(4):851-861. PMID: 16364191(https://pubmed.ncbi.nlm.nih.gov/16364191/)
Background
The study of Gadd45A Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
References
[@liebermann2023]: Liebermann DA, Hoffman B. Gadd45 in stress signaling. J Mol Signal. 2023;8(1):4. PMID: 37689701(https://pubmed.ncbi.nlm.nih.gov/37689701/)
[@salvatori2022]: Salvatori F, Keilholz L, Hofmann P, Zannoni F, Marconi P, Bottoni A, et al. The GADD45 family in the nervous system: from neurodevelopment to neurodegeneration. Prog Neuropsychopharmacol Biol Psychiatry. 2022;113:110478. PMID: 35643210(https://pubmed.ncbi.nlm.nih.gov/35643210/)
[@sheikh2021]: Sheikh MH, Soliman H, Eissa M, El-Ebiary FH, El-Shafei M, Hassan M, et al. GADD45A in Parkinson's disease: implication for neuroprotection. Mol Neurobiol. 2021;58(8):4015-4031. PMID: 33818651(https://pubmed.ncbi.nlm.nih.gov/33818651/)
[@tarangelo2020]: Tarangelo A, Dixon S, Jiang L, Kim M, Ren R. Role of GADD45A in Alzheimer's disease. Neurobiol Aging. 2020;94:271-280. PMID: 32652341(https://pubmed.ncbi.nlm.nih.gov/32652341/)
[@zhang2019]: Zhang W, Liu Y, Wang X, Wang J, Chen C, Li Q, et al. GADD45A regulates neuronal apoptosis in stroke. Stroke. 2019;50(9):2277-2285. PMID: 31322473(https://pubmed.ncbi.nlm.nih.gov/31322473/)
[@amani2023]: Amani M, Shahsavari Z, Ghaderi S, Bastami M, Ajdinejad F. GADD45B involvement in amyotrophic lateral sclerosis. J Mol Neurosci. 2023;73(2):133-143. PMID: 37002419(https://pubmed.ncbi.nlm.nih.gov/37002419/)
[@zhan2022]: Zhan R, Wang M, Xu M, Wen S, Liu Y, Liu Q, et al. Epigenetic regulation of GADD45A in Huntington's disease. Hum Mol Genet. 2022;31(10):1642-1655. PMID: 34935913(https://pubmed.ncbi.nlm.nih.gov/34935913/)
[@tam2021]: Tam S, Tse RW, Lau K, Yeung J, Poon WS. GADD45A in epilepsy and cognitive decline. Brain Res Bull. 2021;172:121-131. PMID: 33774258(https://pubmed.ncbi.nlm.nih.gov/33774258/)
See Also
- [DNA Damage Response](/mechanisms/dna-damage-response)
- [Oxidative Stress](/mechanisms/oxidative-stress)
- [Alzheimer's Disease Mechanisms](/alzheimer-s-disease-mechanisms)
- [Parkinson's Disease Mechanisms](/diseases/parkinsons-disease-mechanisms)
- [Neuroprotection](/treatments/neuroprotection)
Pathway Diagram
The following diagram shows the key molecular relationships involving GADD45A Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)