ATP2A3 Gene
Overview
Mermaid diagram (expand to render)
<table class="infobox infobox-gene">
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<th class="infobox-header" colspan="2">ATP2A3 Gene</th>
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<td class="label">Symbol</td>
<td><strong>ATP2A3</strong></td>
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<td class="label">Full Name</td>
<td>ATP2A3</td>
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<td class="label">Type</td>
<td>Gene</td>
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<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=ATP2A3" target="_blank">Search NCBI</a></td>
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<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/colon-cancer" style="color:#ef9a9a">Colon Cancer</a>, <a href="/wiki/gastric-cancer" style="color:#ef9a9a">Gastric Cancer</a></td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">30 edges</a></td>
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</table>
ATP2A3 (ATPase Sarcoplasmic/Endoplasmic Reticulum Ca2+ Transporting 3, also known as SERCA3) is a calcium pump encoded by the ATP2A3 gene located on chromosome 7p13. This protein is a member of the P-type ATPase family and plays a specialized role in intracellular calcium homeostasis. SERCA3 is increasingly recognized for its involvement in neurodegenerative diseases, particularly Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS).
Gene and Protein Structure
The ATP2A3 gene encodes multiple isoforms through alternative splicing, with the full-length protein comprising approximately 1042 amino acids[@bublitz2018]. SERCA3 belongs to the SERCA family (SERCA1-3) and possesses the characteristic P-type ATPase structure:
- Ten transmembrane domains
- ATP-binding domain (actuator, phosphorylation, nucleotide-binding domains)
- Regulatory N-terminus with phospholamban binding sites
Normal Physiological Function
Calcium Transport
SERCA3 pumps calcium from the cytosol into the endoplasmic reticulum (ER) lumen, playing a critical role in maintaining intracellular calcium homeostasis[@bublitz2018][@brini2009]:
- One ATP hydrolysis transports two calcium ions into the ER
- SERCA3 has different calcium affinity compared to SERCA1/2 isoforms
- Different tissue-specific expression patterns
Cellular Processes
SERCA3 regulates numerous cellular processes[@brini2009]:
- Muscle contraction-relaxation cycle
- ER calcium store maintenance
- Cellular signaling pathways
- Gene expression regulation
- [Apoptosis](/entities/apoptosis) regulation
Tissue Distribution
SERCA3 has distinct tissue distribution:
- High expression in blood cells (platelets, lymphocytes, mast cells)
- Moderate expression in brain ([neurons](/entities/neurons), astrocytes)
- Lower expression in skeletal muscle and heart compared to SERCA2
Role in Neurodegeneration
Alzheimer's Disease
SERCA3 dysfunction is implicated in AD pathogenesis through multiple mechanisms[@sepulveda2010][@costa2020]:
ER calcium dysregulation: AD is characterized by ER calcium store depletion. SERCA3 impairment exacerbates this deficit, contributing to synaptic dysfunction and neuronal death[@sepulveda2010].
[Amyloid-beta](/proteins/amyloid-beta) toxicity: Aβ oligomers directly impair SERCA function, leading to calcium homeostasis disruption[@costa2020].
Synaptic plasticity: Impaired SERCA3 affects calcium-dependent synaptic plasticity mechanisms crucial for learning and memory[@sepulveda2010].
Cellular stress: Chronic calcium dysregulation activates apoptotic pathways[@costa2020].Parkinson's Disease
In Parkinson's disease, SERCA3 involvement includes[@zndorf2011]:
Dopaminergic neuron vulnerability: SERCA3 is highly expressed in dopaminergic neurons; dysfunction contributes to their selective vulnerability[@zndorf2011].
[Alpha-synuclein](/proteins/alpha-synuclein) toxicity: Alpha-synuclein aggregation disrupts ER calcium handling via SERCA3[@zndorf2011].
Mitochondrial dysfunction: SERCA3 impairment affects mitochondrial calcium buffering[@zndorf2011].Amyotrophic Lateral Sclerosis
In ALS, SERCA3 plays a role in motor neuron pathology[@saxena2011]:
ER stress: Motor neurons are particularly dependent on ER calcium homeostasis; SERCA3 dysfunction contributes to ER stress[@saxena2011].
Excitotoxicity: Calcium dysregulation through SERCA3 affects glutamate excitotoxicity[@saxena2011].
Protein aggregation: Impaired calcium handling affects protein quality control mechanisms[@saxena2011].Expression in the Brain
In the central nervous system, SERCA3 is expressed in[@sepulveda2010][@zndorf2011]:
- Cortical neurons (layers II-III, V-VI)
- Hippocampal pyramidal neurons (CA1-CA3)
- Dopaminergic neurons of the substantia nigra
- [Astrocytes](/entities/astrocytes)
- [Microglia](/cell-types/microglia-neuroinflammation)
Expression is modulated by neuronal activity and pathological states.
Therapeutic Implications
Targeting SERCA3 represents a therapeutic strategy for neurodegenerative diseases[@khanna2020]:
Calcium homeostasis modulators: Drugs that enhance SERCA function (e.g., CDN1163) are in development[@khanna2020].
ER stress reducers: Compounds that restore ER calcium balance are being investigated[@khanna2020].
Gene therapy: AAV-mediated SERCA3 overexpression is under exploration[@khanna2020].Key Research Findings
- SERCA3 expression is decreased in AD brain, particularly in vulnerable regions like the [hippocampus](/brain-regions/hippocampus)[@sepulveda2010].
- Genetic variants in ATP2A3 have been associated with PD risk in some populations[@liu2019].
- Pharmacological activation of SERCA improves cognitive function in AD animal models[@khanna2020].
- SERCA3 knockdown induces apoptosis in neuronal cell cultures[@costa2020].
- SERCA3 dysfunction precedes overt neurodegeneration in cellular models[@zndorf2011].
Summary
ATP2A3 (SERCA3) is an ER calcium pump critical for intracellular calcium homeostasis. Its dysfunction contributes to neurodegeneration through ER calcium depletion, synaptic impairment, and activation of apoptotic pathways. Targeting SERCA3 function represents a promising therapeutic approach for AD, PD, and ALS. Understanding the isoform-specific roles of SERCA proteins in neurodegeneration continues to be an active area of research.
See Also
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/)
- [KEGG Pathways](https://www.genome.jp/kegg/pathway.html)
References
[Bublitz, M., et al. (2018), The sarco(endo)plasmic reticulum Ca²⁺-ATPase (SERCA) family: an overview (2018)](https://pubmed.ncbi.nlm.nih.gov/29325603/)
[Brini, M., & Carafoli, E. (2009), Calcium pumps in health and disease (2009)](https://pubmed.ncbi.nlm.nih.gov/19149649/)
[Sepulveda, F.J., et al. (2010), Synaptic dysfunction in Alzheimer's disease: calcium homeostasis and ER stress (2010)](https://pubmed.ncbi.nlm.nih.gov/20458337/)
[Costa, R.O., et al. (2020), ER calcium dysregulation in Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32780621/)
[Zündorf, G., & Reiser, G. (2011), Calcium dysregulation and apoptosis in neurodegenerative disease (2011)](https://pubmed.ncbi.nlm.nih.gov/21807245/)
[Saxena, S., & Caroni, P. (2011), Selective neuronal vulnerability in neurodegenerative diseases (2011)](https://pubmed.ncbi.nlm.nih.gov/21435442/)
[Khanna, R., et al. (2020), Targeting calcium homeostasis in neurodegenerative diseases (2020)](https://pubmed.ncbi.nlm.nih.gov/32893267/)
[Liu, X., et al. (2019), Association between ATP2A3 polymorphisms and Parkinson's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31149823/)Pathway Diagram
The following diagram shows the key molecular relationships involving ATP2A3 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)