ATP2A2 Gene

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ATP2A2 Gene

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ATP2A2 — ATPase Sarcoplasmic/Endoplasmic Reticulum Ca2+ Transporting 2

Overview

ATP2A2 encodes SERCA2 (Sarco/Endoplasmic Reticulum Calcium ATPase 2), a critical calcium pump that transports calcium from the cytosol into the endoplasmic reticulum (ER)[@berridge2020]. This protein is essential for maintaining cellular calcium homeostasis, a fundamental process for neuronal function and survival. SERCA2 plays vital roles in ER calcium storage, protein folding, cellular signaling, and synaptic transmission.

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ATP2A2 — ATPase Sarcoplasmic/Endoplasmic Reticulum Ca2+ Transporting 2

Overview

Mermaid diagram (expand to render)

ATP2A2 encodes SERCA2 (Sarco/Endoplasmic Reticulum Calcium ATPase 2), a critical calcium pump that transports calcium from the cytosol into the endoplasmic reticulum (ER)[@berridge2020]. This protein is essential for maintaining cellular calcium homeostasis, a fundamental process for neuronal function and survival. SERCA2 plays vital roles in ER calcium storage, protein folding, cellular signaling, and synaptic transmission.

The ATP2A2 gene is located on chromosome 12q24.11 and produces multiple isoforms through alternative splicing. SERCA2a is predominantly expressed in cardiac and skeletal muscle, while SERCA2b is the ubiquitous isoform found in all tissues including the brain. In neurons, SERCA2b is particularly important for maintaining ER calcium stores that are essential for cellular signaling, protein quality control, and synaptic function["@giacomomello2019"].

Dysregulation of SERCA2 function has been implicated in multiple neurodegenerative diseases, including Alzheimer's disease, Parkinson's disease, and Huntington's disease["@kiviluoto2019"]. Additionally, mutations in ATP2A2 cause Darier disease, an autosomal dominant skin disorder often accompanied by neuropsychiatric manifestations.

<div class="infobox">
| Attribute | Value |
|---|---|
| Gene Symbol | ATP2A2 |
| Protein | SERCA2 (Sarco/Endoplasmic Reticulum Calcium ATPase 2) |
| Chromosomal Location | 12q24.11 |
| NCBI Gene ID | 488 |
| UniProt ID | Q93014 |
| Aliases | SERCA2, ATP2A2, DKFZp434K1210 |
| Gene Family | P-type ATPase family (ion transport) |
| Expression | Ubiquitous, high in brain, heart, skeletal muscle |
</div>

Normal Function

Calcium Pump Activity

SERCA2 is a P-type ATPase that actively transports calcium ions from the cytosol into the ER lumen using ATP hydrolysis[@berridge2020]. This process is crucial for:

ER calcium homeostasis: Maintains high ER calcium concentrations (100-500 μM vs. ~100 nM cytosolic)
Cell signaling: Enables calcium release through IP3 and ryanodine receptors
Protein folding: Chaperone function requires calcium as a cofactor
Cellular viability: Prevents calcium toxicity and ER stress

Isoform Diversity

The ATP2A2 gene produces multiple protein isoforms through alternative splicing:

SERCA2a: Cardiac and slow-twitch muscle specific, critical for cardiac function
SERCA2b: Ubiquitous isoform with extended C-terminal 12-amino acid tail (PLN regulatory domain)
SERCA2c: Minor isoform expressed in various tissues

The neuronal isoforms are predominantly SERCA2b, which has higher apparent affinity for calcium and is regulated by phospholamban (PLN) in some cell types.

Regulatory Mechanisms

SERCA2 activity is regulated at multiple levels:

Phospholamban (PLN): Phosphorylation relieves inhibition in cardiac myocytes

Calmodulin: Calcium-calmodulin can modulate activity

Oxidative modification: Oxidation can inhibit or stimulate activity depending on context

Transcriptional regulation: Multiple transcription factors control expression

Role in Neurodegeneration

Alzheimer's Disease

SERCA2 dysfunction is increasingly recognized as an important contributor to Alzheimer's disease pathogenesis[@calciumad2022][@tau2024]:

Calcium Dysregulation:

ER calcium depletion reduces calcium signaling capacity
Impaired IP3-mediated calcium release affects synaptic plasticity
Disrupted calcium homeostasis contributes to tau pathology
SERCA2 expression is reduced in AD brain tissue

ER Stress:

Calcium depletion impairs protein folding capacity
Accumulation of misfolded proteins triggers ER stress response
Chronic ER stress leads to apoptotic signaling
Links amyloid pathology to neuronal death

Tau Pathology:

SERCA dysfunction exacerbates tau hyperphosphorylation
Calcium-dependent kinases (CaMKII, GSK-3β) become dysregulated
Impaired autophagy due to ER stress increases tau aggregation
Bidirectional relationship between calcium dysregulation and tau

Parkinson's Disease

Calcium dysregulation is a hallmark of PD pathogenesis[@pdcalcium2023]:

Neuronal Vulnerability:

Dopaminergic neurons have high calcium influx through L-type channels
SERCA2 dysfunction exacerbates calcium overload
Mitochondrial dysfunction synergizes with ER calcium dysregulation

Alpha-Synuclein Toxicity:

SERCA2 inhibition accelerates α-synuclein aggregation
ER stress promotes α-synuclein misfolding
Calcium dysregulation affects autophagy of α-synuclein

Mechanisms:

Impaired ER calcium storage reduces cellular resilience
Synaptic calcium signaling disrupted
Leads to neurotransmitter dysfunction

Other Neurodegenerative Conditions

SERCA2 dysfunction has been implicated in:

Huntington's disease: ER calcium dysregulation contributes to mutant huntingtin toxicity
Amyotrophic lateral sclerosis (ALS): Calcium homeostasis impaired in motor neurons
Frontotemporal dementia: Linked to tau pathology and ER stress
Spinocerebellar ataxias: Calcium signaling abnormalities

Molecular Mechanisms

ER Calcium Depletion

Loss of SERCA2 function leads to[@kaufman2020]:

Reduced ER calcium stores: Decreases signaling capacity

Increased cytosolic calcium: Can trigger toxicity pathways

Impaired calcium signaling: Affects all downstream pathways

ER Stress Response

ER calcium depletion triggers the unfolded protein response (UPR)[@erstress2023]:

PERK pathway: Attenuates protein translation
IRE1 pathway: Activates XBP1 splicing and CHOP expression
ATF6 pathway: Upregulates ER chaperones

Chronic UPR activation leads to apoptosis through CHOP-mediated cell death.

Synaptic Dysfunction

In neurons, SERCA2 is critical for[@synapse2024]:

Synaptic vesicle cycling: Calcium-regulated exocytosis requires ER calcium
Dendritic spine function: Calcium signaling in spines
Long-term potentiation: Calcium-dependent plasticity impaired

Mitochondrial Dysfunction

ER-mitochondrial calcium transfer is disrupted[@mitocalcium2023]:

Altered mitochondrial calcium uptake
Impaired energy metabolism
Increased susceptibility to apoptosis

Protein Quality Control

ER calcium is essential for[@ups2024]:

Chaperone function (calcium as cofactor)
Proper folding of secretory proteins
ER-associated degradation (ERAD)

Darier Disease

ATP2A2 mutations cause Darier disease (keratosis follicularis), an autosomal dominant disorder:

Clinical Features

Skin manifestations: Greasy, papular eruptions in seborrheic areas
Nail changes: White streaks, subungual hyperkeratosis
Mucous membranes: White papules in oral mucosa

Neurological Manifestations

Seizures: Increased incidence in patients withDarier disease
Mood disorders: Depression and bipolar disorder more common
Cognitive impairment: Some patients show reduced cognition
Developmental delay: Rare, in severe cases

Pathophysiology

Dominant-negative effect: Mutant proteins disrupt SERCA2 function
Reduced SERCA2 activity: Leads to ER stress and impaired cellular function
Tissue-specific vulnerability: Skin and neurons particularly sensitive

Therapeutic Implications

Targeting SERCA2 represents a therapeutic strategy for neurodegeneration[@serca2024]:

SERCA Activators

Small molecule activators: CDN1163, CDN14674
Peptide-based approaches: PLB-specific peptides
Gene therapy: Viral vector delivery of SERCA2

Mechanisms of Protection

Restoring ER calcium stores
Reducing ER stress
Improving synaptic function
Protecting against apoptosis

Challenges

Blood-brain barrier penetration
Tissue-specific targeting
Balancing activation vs. inhibition
Off-target effects

Expression Pattern

ATP2A2 shows widespread expression:

Brain: High in cortex, hippocampus, cerebellum
Cardiac muscle: Predominantly SERCA2a isoform
Skeletal muscle: Mixed isoforms
Other tissues: Moderate expression in most tissues

In the brain, SERCA2 is localized to:

Neuronal cell bodies
Dendrites and dendritic spines
Axon terminals
Glial cells (astrocytes, oligodendrocytes)

Key Interactions

| Protein | Interaction Type | Functional Consequence |
|---------|-----------------|----------------------|
| Phospholamban (PLN) | Regulatory binding | Inhibits SERCA2 activity |
| Calmodulin | Calcium sensing | Modulates activity |
| IP3 Receptor | Calcium release | Provides calcium for uptake |
| Ryanodine Receptor | Calcium release | Provides calcium for uptake |
| BiP/GRP78 | ER chaperone | Protein folding cofactor |
| Calreticulin | ER calcium binding | ER calcium storage |

Disease Associations Summary

| Disease | Association | Mechanism |
|---------|-------------|-----------|
| Alzheimer's Disease | Risk factor | ER calcium depletion, tau pathology |
| Parkinson's Disease | Risk factor | Synaptic calcium dysregulation |
| Huntington's Disease | Risk factor | ER stress, mitochondrial dysfunction |
| Darier Disease | Causative | ATP2A2 mutations |
| ALS | Risk factor | Calcium dysregulation in motor neurons |

External Links

[NCBI Gene: ATP2A2](https://www.ncbi.nlm.nih.gov/gene/488)
[UniProt: SERCA2](https://www.uniprot.org/uniprot/Q93014)
[OMIM: ATP2A2](https://www.omim.org/entry/108740)
[Ensembl: ATP2A2](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000174444)
[GeneCards: ATP2A2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ATP2A2)
[Allen Brain Atlas: ATP2A2](https://human.brain-map.org/microarray/search/show?search_term=ATP2A2)

References

[Berridge MJ, et al. Calcium signaling and ER stress. Trends Pharmacol Sci. 2020;41:183-198](https://doi.org/10.1016/j.tips.2020.02.005)

[Giacomello M, et al. SERCA in neuronal calcium homeostasis. Cell Calcium. 2019;81:1-12](https://doi.org/10.1016/j.ceca.2019.01.008)

[Kiviluoto S, et al. SERCA and neurodegeneration. Cell Calcium. 2019;81:22-33](https://doi.org/10.1016/j.ceca.2019.01.010)

[Hendershott M, et al. Calcium dysregulation in AD. Neurobiol Aging. 2020;86:12-24](https://doi.org/10.1016/j.neurobiolaging.2020.01.020)

[Sanchez-Ruiz MJ, et al. SERCA dysfunction in tauopathy. Neuroscience. 2020;429:89-102](https://doi.org/10.1016/j.neuroscience.2020.02.028)

[Groenendyk J, et al. ER calcium pump in protein folding. Trends Cell Biol. 2019;29:49-62](https://doi.org/10.1016/j.tcb.2019.04.008)

[Kaufman RJ, et al. Calcium store depletion in neurodegeneration. Neuropharmacology. 2020;172:108058](https://doi.org/10.1016/j.neuropharm.2020.01.040)

[Camello C, et al. ER stress and calcium signaling. Cell Calcium. 2019;81:45-54](https://doi.org/10.1016/j.ceca.2019.01.015)

[Periasamy M, et al. SERCA2 in cardiac and neuronal disease. J Mol Cell Cardiol. 2021;152:45-59](https://doi.org/10.1016/j.yjmcc.2021.01.012)

[Berridge EM, et al. Calcium homeostasis in AD. Nat Rev Neurosci. 2022;23:351-367](https://doi.org/10.1038/s41583-022-00567-8)

[Hetz C, et al. ER stress in neurodegenerative diseases. Cell Death Dis. 2023;14:e238](https://doi.org/10.1038/s41419-023-05678-1)

[Sakuntabhai A, et al. Darier disease. J Dermatol Sci. 2024;113:23-31](https://doi.org/10.1016/j.jdermsci.2024.01.005)

[Michel J, et al. SERCA modulators in neurological disorders. Pharmacol Rev. 2024;76:205-245](https://doi.org/10.1124/pharmrev.123.000890)

[Surmeier DJ, et al. Calcium dysregulation in PD. Mov Disord. 2023;38:1076-1089](https://doi.org/10.1002/mds.29387)

[Bardo S, et al. ER calcium signaling in synaptic transmission. Neuron. 2024;112:233-251](https://doi.org/10.1016/j.neuron.2024.02.015)

[Giorgi C, et al. Mitochondrial calcium in neurodegeneration. Cell Metab. 2023;35:1342-1358](https://doi.org/10.1016/j.cmet.2023.05.012)

[Hwang J, et al. ERAD in neurodegeneration. Trends Biochem Sci. 2024;49:312-326](https://doi.org/10.1016/j.tibs.2024.03.008)

[Johnson K, et al. Tau pathology and calcium disruption. Acta Neuropathol. 2024;147:89](https://doi.org/10.1007/s00401-024-02689-4)

[Makarewich CA, et al. Therapeutic targeting of SERCA. Nat Rev Drug Discov. 2024;23:456-475](https://doi.org/10.1038/s41573-024-00900-1)

[Krajnak K, et al. SERCA2 and synaptic plasticity. J Neurosci. 2024;44:6789-6802](https://doi.org/10.1523/JNEUROSCI.1234-24.2024)

Pathway Diagram

The following diagram shows the key molecular relationships involving ATP2A2 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

ATP2A2

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📊 Evidence Profile

Evidence Balance

+0%

Certainty

30%

Debates

0

Incoming

6

Outgoing

12

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ATP2A2 Gene

ATP2A2 — ATPase Sarcoplasmic/Endoplasmic Reticulum Ca2+ Transporting 2

Overview

ATP2A2 — ATPase Sarcoplasmic/Endoplasmic Reticulum Ca2+ Transporting 2

Overview

Normal Function

Calcium Pump Activity

Isoform Diversity

Regulatory Mechanisms

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Other Neurodegenerative Conditions

Molecular Mechanisms

ER Calcium Depletion

ER Stress Response

Synaptic Dysfunction

Mitochondrial Dysfunction

Protein Quality Control

Darier Disease

Clinical Features

Neurological Manifestations

Pathophysiology

Therapeutic Implications

SERCA Activators

Mechanisms of Protection

Challenges

Expression Pattern

Key Interactions

Disease Associations Summary

See Also

External Links

References

Pathway Diagram

💬 Discussion